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odot -PNM02 V2.0 User Manual

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ODOT-PNM02 V2.0
Protocol Converter
User Manual
V1.7
2022.02.08
http:// www.odotautomation.com
TEL: +86-0816-2538289
1 / 100

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Summary of Contents for odot ODOT-PNM02 V2.0

  • Page 1 ODOT-PNM02 V2.0 Protocol Converter User Manual V1.7 2022.02.08 http:// www.odotautomation.com TEL: +86-0816-2538289 1 / 100...
  • Page 2 Modbus-RTU/ASCll or Non-standard protocol to ProfiNet Converter Odot Automation System Co., Ltd. 2018-03 Copyright ©2019 Odot Automation all rights reserved http:// www.odotautomation.com TEL: +86-0816-2538289 2 / 100...
  • Page 3 Version Information The document has the following modifications： Date Version Modify content Author 20180301 V1.0 release version 20180801 V1.1 update content Added related descriptions 20190520 V1.2 used in Step7 20190924 V1.3 Freeport mode added Added the application of Freeport mode in TIA/STEP7 20191118 V1.4 V5.5/STEP 7-MicroWIN...
  • Page 4 4. ODOT-PNM02 V2.0 hardware revision, and the two serial ports could independently set working mode, but the converter function does not support IRT and MRP.
  • Page 5 ODOT-PNM02 V2.0 ...................... 1 Protocol Converter ......................1 1.product description...................... 6 1.1 Product Features....................6 1.2 The main technical parameters ................ 7 1.3 Technical parameters ..................8 2.Hardware description ....................10 2.1 Appearance ..................... 10 2.2 Indicator LED description................12 2.3 Terminal definition ..................
  • Page 6 Notice: The product marked as ODOT-PNM02, and the GSD file uses the GSD configuration PNM02 V1.5 in GSDML-V2.33-ODOT-PNM02-20191008.xml. The product marked as ODOT-PNM02 V2.0...
  • Page 7 1.2 The main technical parameters ◆ Installation method：35mm standard rail installation ◆ Dimension：110*110*27.5mm ◆ Support standard ProfiNet I/O Device V2.3 ◆ Profiet data area：The max input is 1440 bytes, and the max output is 1440 bytes. ◆ It supports RT (synchronization), does not support IRT (isochronous synchronization), MRP (media redundancy protocol), and MRPD (media path planning redundancy) functions.
  • Page 8 1.3 Technical parameters General Parameters Module Description Modbus or private protocol to Profinet protocol converter Power supply 19.2-28.8VDC (nominal: 24VDC) Power protection Anti-reverse protection Power consumption Max.86mA@24VDC The isolation voltage between system power and PE is AC 500V The isolation voltage between I/O channel and PE is AC Isolation 500V The isolation voltage between system power and I/O...
  • Page 9 Network parameter 10/100Mbps, Self-adaption, Full-Duplex a maximum of 1440 bytes for input and 1440 bytes for Data Area output Default IP Address 192.168.0.254 Default Devices Name pnmb-address Supported Not supported Not supported MRPD Not supported Downward Compatibility Not supported Serial Port Parameters Number of Serial Port 2 *RS485/RS232/RS422 Wiring Terminal...
  • Page 10 2.Hardware description 2.1 Appearance The upper panel has two ProfiNet interfaces and power connection terminals. PORT1 and PORT2, the two interfaces have the same function. These two interfaces have the switch function, that is, the host computer can access the equipment connected to PORT2 through the PORT1 interface, as shown in the figure below (the computer IP is 192.168.1.92, the computer is connected to the PORT2 port, Siemens S7 -1200 connects to PORT1), the upper computer software can search for devices in the same...
  • Page 11 http:// www.odotautomation.com TEL: +86-0816-2538289 11 / 100...
  • Page 12 2.2 Indicator LED description The equipment has 6pcs of LED status indicators, the symbol definition and status description are shown in the table below. Symbol Definition Status Description Red light is on power supply on Power indicator Red light is off Power is not connected Red light is on Device failure...
  • Page 13 2TA+ Serial port 2 (A+) Serial port2 (TX+) 2TB- Serial port 2 (B-) Serial port2 (TX-) Serial port2 (RX+) Serial port2 (RX-) Common ground (signal ground) Serial port 2 (TX) Serial port 2 (RX) Shield ground The definitions of power wiring terminals are shown as below: Termials Definitions Grounding...
  • Page 14 2.5 Installation size http:// www.odotautomation.com TEL: +86-0816-2538289 14 / 100...
  • Page 15 3. Product application 3.1 Converter working mode Each serial port of the converter has 3 working modes: Modbus master, Modbus slave, and free port transparent transmission mode. When the serial port works in master mode and the serial port can connect up to 31pcs of Modbus RTU/ASCII slave devices.
  • Page 16 default value is 9600bps. M/S/F: customized baud rate. 0, 300-500000bps can be set. The default value is 9600bps. Note: If some customer equipment is with non-standard baud rate, and it can customize the baud rate. M/S/F: Data bits: 7 bits and 8 bits are optional. The default value is 8 bits. M/S/F: parity bit: none, odd, even, character, space is optional.
  • Page 17 valid only in module control enable mode. M: first output data after power on (command): Enable and disable are optional. This default is enabled. S: Slave ID: 1-247 can be set. This parameter is valid only in slave mode. S: Response delay (ms): 0~65535 is optional. The default value is 50. 3.3 Converter read and write command module 3.3.1 Module in master mode M: diagnosis module...
  • Page 18 module control) of the serial port is set to enable mode, the output control read and write channels of this command is effective. 4. Polling time: used to monitor the polling time of the serial port. The slave input status of the module can monitor communication failures. For detailed description, please see "Modbus Error Code Table".
  • Page 19 The reply data length 0x0E Check the hardware connection status does not match Increase the timeout period, check the hardware Communication 0x0F connection status and the communication timeout parameter settings Error in ASCII mode 0x10 ‘:’ The colon start character error start character ASCII mode ending 0x11...
  • Page 20 direction Output control Control_Word_Feedback uint16_t word - feedback Send frame length Send_Data_Len_Feedback uint16_t - feedback Serial port status COM_Status uint16_t Received error Input data Error_Counter uint16_t frame count Total received Received_Counter uint16_t data frame count The current length of received frames Received_Data_Len uint16_t in bytes...
  • Page 21 sending frame byte length is refreshed to the module, it will be updated to the sending frame byte length feedback. 3.In answer mode, the Busy bit is set to 1 when the serial port sends data. 3.1 When the serial port receives the answer within the timeout period, the Busy bit is cleared and the Done bit is 1.
  • Page 22 3.4 Modify the device name 3.4.1 Modify the device name in TIA 1.Power on Siemens PLC and ODOT-PNM02 V2.0. At the same time, use network cables to connect to the PC. Open the Portal software, click to the Oline access, find the local network card, double-click Update accessible devices, Siemens PLC and ODOT-PNM02 gateways will be searched.
  • Page 23 http:// www.odotautomation.com TEL: +86-0816-2538289 23 / 100...
  • Page 24 PG/PC interface. 2. Click "PLC" → "Edit Ethernet node", in the "Edit Ethernet node" page, click browse, in the "Browse network" page, it could see the scanned ODOT-PNM02 module, the default name of the module is "pnmb-address", select the module, click "flash", The "SF"...
  • Page 25 Note: Changing the device name is mainly used when multiple ODOT-PNM02 modules exist on the network. If there is only one ODOT-PNM02 module on the network, it could directly use its factory default name pnmb-address in the subsequent configuration without changing the device name.
  • Page 26 3.4.3 Modify the device name in STEP 7-MicroWIN SMART Open the STEP 7-MicroWIN SMART software, click the Tools, click the Find PROFINET Devices, select local network card, all PROFINET devices are automatically scanned, the IP address and device name of the gateway could be viewed.
  • Page 27 3.5 Converter application topology Topology diagram of master Mode Topology diagram of slave mode http:// www.odotautomation.com TEL: +86-0816-2538289 27 / 100...
  • Page 28 Topology of freed mode http:// www.odotautomation.com TEL: +86-0816-2538289 28 / 100...
  • Page 29 This chapter will be written with SIEMENS S7-1200 CPU1212 DC/DC/DC as the PROFINET Controller, TIA is used as the configuration software, this section provides an example of how to configure ODOT-PNM02. 4.1 Configuration of the MODBUS Master Mode 1.Find the XML folder in the product CD and make sure that the following files are in the folder.
  • Page 30 "PLC device IP Address" and "PNMB-Address device IP Address" appear, click "Online & diagnostics" under the PNMB-address, it could set " ProfiNet device name" in the "Function" drop-down menu, which is used to access the gateway module in the later configuration. http:// www.odotautomation.com TEL: +86-0816-2538289 30 / 100...
  • Page 31 4.Click "Add new device", select controller CPU 1212C DC/DC/DC (6ES7 212-1AG40-0XB0 V4.4), and click OK. 5.Click device configuration under PLC - "Network view", click PLC network port, and set the ProfiNet network and IP address of PLC PN port. http:// www.odotautomation.com TEL: +86-0816-2538289 31 / 100...
  • Page 32 6.On the device configuration interface, click "Options" → "Manage general station description files (GSD)", select the path, find " GSDML-V2.33-ODOT-PNM02-L-20220107", and add the GSD file. http:// www.odotautomation.com TEL: +86-0816-2538289 32 / 100...
  • Page 33 After success, click "Close" to exit the add GSD dialog box. 7.Click device configuration under PLC - "Network view". In the hardware directory, click other field devices→ “PROFINET IO→Gateway→Odot Co., Ltd→Serial Gateway → Modbus Gateway”, if the PNM02L V2.00 is found, the GSD file is successfully added.
  • Page 34 9.Connect the PNM02 gateway network to the PN interface of the S7-1200 PLC. Select the PN port of the PNM02 gateway and click Ethernet address to set parameters. Set the gateway communication IP address and enter the "ProfiNet Device name " set before online access. Note: The device name must be the same as the previous device.
  • Page 35 11.Double-click the gateway to enter Device view, select the gateway, and set the module parameters under General. (Set the parameters of the module with the M prefix). 12.Select a gateway in the Device view and select "Read/Write Command starting with M prefix " in the hardware directory on the right. When need to monitor the status of the module, it could first add "Diagnostic Modules".
  • Page 36 M: Diagnostic modules: including module status input, module error code input, module control output, polling time input; The command of the diagnostic module must be added to the first eight lines of the slot; otherwise, an error will be reported when the command is downloaded.
  • Page 37 the error code module could display the function code and specific error code of the error channel. Users could determine the cause of the fault according to the error code, and then take the corresponding adjustment method. For details, see Modbus Error Code Table. Modbus Error Code Table Error Fault description...
  • Page 38 0x06 protocol ID error Check the sender message 0x07 buffer address error Device internal error 0x08 bit offset error Device internal error Increase the timeout period, check the hardware The slave ID does not 0x09 connection status and the communication match parameter settings 0x0A...
  • Page 39 Note: The module control output function is activated. The read and write commands within the control range must be enabled. Polling time input: used to monitor the polling time of the serial port. Note: Serial port 1 and serial port 2 are independent, so when need to use the two serial ports to collect data, add two commands to monitor the polling time respectively.
  • Page 40 13.After adding read and write commands, it needs to set module parameters for the commands. Ensure that the serial port number of the command is COM1 or COM2 (set to COM1 in this section), the ID of the slave, and the data start address. 14.At this time, the hardware configuration has been basically completed, save the project, compile.
  • Page 41 After the download is successful, open the monitoring table to monitor the data collected by the gateway. Using Modbus Slave to simulate devices on the RS485 serial port. http:// www.odotautomation.com TEL: +86-0816-2538289 41 / 100...
  • Page 42 4.2 Configuration of the MODBUS Slave Mode 1→10 Refer to 1→10 in 4.1(Modbus Master). 11.Double-click the gateway to enter the Device view, select the gateway, and set the module parameters under the general parameters. (Set the parameters of the module with the S prefix）...
  • Page 43 S: Diagnostic module: S: Input status from the Modbus slave: Indicates the processing of data packets sent from the Master of the current serial port. 13.As the slave, the gateway avoids the problem of overlapping addresses when customers use zone 0 and zone 4 output data, PN output data uses zone 1 and zone 3, and input data uses zone 0 and zone 4.
  • Page 44 14.After the read and write commands are added, do not need to set module parameters for the read and write commands. For details about how to access the address, as follows: The address table corresponds to the read and write commands in the slot one by one.
  • Page 45 16.After the download is successful, open the monitoring table. Modbus Poll is used to simulate the master RS485 device on the serial port RS485 side. http:// www.odotautomation.com TEL: +86-0816-2538289 45 / 100...
  • Page 46 4.3 Configuration of the Freed Mode 1→10 Refer to 1→10 in 4.1(Modbus Master). The freed mode test uses the S7-1200 configuration test. 11.Double-click the gateway to enter the device view, select the gateway, and set the module parameters under the general parameters. M/S/F Serial port working mode: Freed Mode.
  • Page 47 debugging serial port tool to simulate field devices. The corresponding value changes could be monitored in the control and status module and the input data module. （2）Set the gateway to Request-Response mode. http:// www.odotautomation.com TEL: +86-0816-2538289 47 / 100...
  • Page 48 Set the output data length, when the control word Trigger is activated as 0-1 pulse, the gateway sends data to the serial port. Note: The Trigger bit is activated once and the gateway sends data once. Through setting and debugging, PLC collects data from the serial port side through the gateway and stores it in the PLC address area, engineers parse the data format of uploaded messages and extract valid data for programming processing.
  • Page 49 5. Use in STEP7 V5.5 In this chapter, SIEMENS 315-2 PN/DP is used as PROFINET Controller and Step7 is used as programming software to illustrate the use of PNM02. PLC, debug computer and PNM02 are connected to the same Ethernet network at first. 5.1 Configuration of the Modbus Master mode 1.
  • Page 50 The default name of the module is "PMB-address". Select the module, click "flash". The "SF" light on the module flashes, which allows to distinguish modules when there are multiple ODOT-PNM02 modules in the network at the same time. Select a module and click "OK". The software will automatically write the MAC address of the selected module into the corresponding position on the "Edit Ethernet...
  • Page 51 ODOT-PNM02 modules exist on the network. If there is only one ODOT-PNM02 module on the network, do not change the device name of the Odot-PNM02 module, and directly use its default name "PMB-address"...
  • Page 52 4. On the hardware configuration page of STEP7, click "Options" → "Install GSD file", click "Browse" in "Install GSD file" to select the path, find the folder where the XML file corresponding to ODOT-PNM02 resides, click "OK", select the XML file, and click "Install". Install the XML file of ODOT-PNM02 into STEP7.
  • Page 53 PNM02 gateway to the PROFINET network. 7. Select the ODOT-PNM02 device icon, enter the device name in the "General" TAB of the "Properties" page, which must be consistent with the module name set in Step 3, click "Ethernet", set the module IP address, and click "Confirm".
  • Page 54 TAB in the pop-up property window to modify the ODOT-PNM02 module parameters. 9. Select the device icon of ODOT-PNM02, in the module slot information display section at the bottom of the software, select the slot, double-click the module under the module folder under PNM02 in the directory view, and insert the module into the slot.
  • Page 55 the slot. 10. After adding the read and write command, double-click the command module, and set the parameters of the command module under the "Parameters" TAB on the "Properties" page. The value includes the serial port number (UART Num) COM1 or COM2, Slave ID, and Start Address of the Modbus slave.
  • Page 56 compile the hardware configuration and download the project. 12. Right-click the command, click the "Monitor/Modify" option, and select "Monitor" on the "Monitor/Modify" page to monitor the communication data in real time, which is convenient for debugging (if the command is to write data, you can write the data to the slave Modbus device by clicking the "Modify value"...
  • Page 57 5.2 Configuration of the Modbus slave mode 1→7 Refer to 1→7 in section 5.1(Master Mode). 8. Select the ODOT-PNM02 device icon, double-click the first slot in the module slot information display section at the bottom of the software, and select the parameter TAB in the pop-up property window to modify the ODOT-PNM02 module parameters.
  • Page 58 The gateway, as the slave station, supports Modbus function code 01/02/03/04/15/16. Add the Modbus RTU/ASCII address command supported by the gateway to the slot. 10. After adding read and write commands, do not need to set module parameters for the read and write commands. The Modbus address range corresponding to each command is automatically generated according to the following rules: The Modbus addresses corresponding to commands in the same Modbus data area are automatically added starting from 0 in the slot sequence.
  • Page 59 11. At this time the hardware configuration has been basically completed, save and compile, download. 12. Right-click the command, click "Monitor/Modify" option, select "Monitor" on the "Monitor/Modify" page, it could monitor the communication data in real time, this http:// www.odotautomation.com TEL: +86-0816-2538289 59 / 100...
  • Page 60 function could be convenient debugging (if the command is to write data, click the "modify value" button to write the data). http:// www.odotautomation.com TEL: +86-0816-2538289 60 / 100...
  • Page 61 5.3 Configuration of the Freed mode 1→7 Refer to 1→7 in section 5.1(Master Mode). 8. Select the ODOT-PNM02 device icon, double-click the first slot in the module slot information display section at the bottom of the software, and select the parameter TAB in the pop-up property window to modify the ODOT-PNM02 module parameters.
  • Page 62 12. Set the gateway to the active reporting mode, and connect the gateway serial port 1 to the debugging serial port tool to simulate the field devices (such as the scanning gun and weighing instrument). Save, download. The corresponding value changes could be monitored in the control and status module and the input data module.
  • Page 63 http:// www.odotautomation.com TEL: +86-0816-2538289 63 / 100...
  • Page 64 1. Open the STEP 7-MicroWIN SMART software, click the file, click GSDML management, and in the pop-up interface, find the directory where the GSD file of ODOT-PNM02 is located, and click confirm. 2. Click Find PROFINET devices, select the local network card, and all PROFINET devices will be automatically scanned, and the IP address and device name of the gateway could be viewed.
  • Page 65 3. Click Tools, click PROFINET, in the pop-up PROFINET configuration interface, select the PLC role is Controller, set the IP address of the PLC, and click Next. http:// www.odotautomation.com TEL: +86-0816-2538289 65 / 100...
  • Page 66 4. In the pop-up interface, select PNM02L in the directory bar on the right, and click the Add button in the lower left corner to add the gateway to the PROFINET bus of the PLC. It could change the IP address and device name of the gateway. Note: The device name must be the same as the device name that was scanned or modified.
  • Page 67 6.Select the PNM02L V2.0V4.0-pnmb-1, add the read/write commands and the Module Error Code Input(06CH). 7.For each read/write command, it could modify the serial port, slave ID and start address. The first four commands use the default values, modify the start address of the sixth commands as 50, and modify the start address of the seventh commands as 50.
  • Page 68 8.Save, compile and download. http:// www.odotautomation.com TEL: +86-0816-2538289 68 / 100...
  • Page 69 9. When the program is running, it could use the state chart to read, write, monitor, and force the variables in it. 10.Modbus Slave is used to simulate the RS485 device. Click the online of the STEP 7-Micro/WIN SMART software, click the status icon to monitor the data on the RS485 device.
  • Page 70 http:// www.odotautomation.com TEL: +86-0816-2538289 70 / 100...
  • Page 71 1. Open the STEP 7-MicroWIN SMART software, click the file, click GSDML management, and in the pop-up interface, find the directory where the GSD file of ODOT-PNM02 is located, and click confirm. 2. Click Find PROFINET devices, select the local network card, and all PROFINET devices will be automatically scanned, and the IP address and device name of the gateway could be viewed.
  • Page 72 3. Click Tools, click PROFINET, in the pop-up PROFINET configuration interface, select the PLC role is Controller, set the IP address of the PLC, and click Next. 4. In the pop-up interface, select PNM02L in the directory bar on the right, and click the Add button in the lower left corner to add the gateway to the PROFINET bus of the PLC.
  • Page 73 modified. 5.Select the PNM02 to modify the working mode and serial port parameters, in this section, the working mode is Modbus Slave, the Slave ID is 6. http:// www.odotautomation.com TEL: +86-0816-2538289 73 / 100...
  • Page 74 6.Select the PNM02L V2.0V4.0-pnmb-2, add the slave mode read and write command on the right to the slot, click the Generate, complete the configuration of the gateway PNM02 slave mode. 7. Save, compile, and download. http:// www.odotautomation.com TEL: +86-0816-2538289 74 / 100...
  • Page 75 8. When the program is running, it could use the state chart to read, write, monitor, and force the variables in it. 9. Use Modbus Poll to simulate the RS485 master equipment in the field. STEP 7-Micro/WIN SMART software could be run online, and the status chart monitoring button could be clicked to monitor the data on the RS485 side.
  • Page 76 http:// www.odotautomation.com TEL: +86-0816-2538289 76 / 100...
  • Page 77 6.3 Configuration of the Freed mode 6.3.1 The introduction of Freed mode In the Freed mode, it is divided into control and status module and input and output data module. (1) The control and status module need to set the serial port and unvarnished transmission type.
  • Page 78 Received_Data_Len Received_Data_Len Input Data Description: 1.Control_Word_Feedback indicates the feedback value of the output control word Control_Word. After the output control word is refreshed to the module, it will be updated to the control word feedback. 2.Send_Data_Len_Feedback is the feedback value of Send_Data_Len. After the sending frame byte length is refreshed to the module, it will be updated to the sending frame byte length feedback.
  • Page 79 3. In the master/slave response mode, the Trigger ascending delay will trigger the serial port to send data once. The serial port sends data packets according to the data length of Send_Data_Len and waits for the response processing. http:// www.odotautomation.com TEL: +86-0816-2538289 79 / 100...
  • Page 80 6.3.2 Configuration of Freed mode 1. Open the STEP 7-MicroWIN SMART software, click the find PROFINET Devices， select the local network card, and all PROFINET devices will be automatically scanned, and the IP address and device name of the gateway could be viewed. Click Edit to set the gateway device name.
  • Page 81 Select the PNM02 to modify the working mode and serial port parameters, in this section, the working mode is Freed mode Select the PNM02L V2.0V4.0-pnmb-2, add the read and write commands in Freed mode on the right to the slot. Set the communication mode as report, click the generate, complete the configuration of Freed mode.
  • Page 82 Set the communication mode as report, Serial Port Utility is used to simulate RS485 equipment. After compiling and downloading, it could monitor the corresponding value changes in the chart status control and status module and input data module. http:// www.odotautomation.com TEL: +86-0816-2538289 82 / 100...
  • Page 83 Set the communication mode as request-response. Set the send byte length to 8. When the control word Trigger is activated as 0-1 pulse, the gateway sends data to the serial port. Note: The Trigger bit is activated once and the gateway sends data once. http:// www.odotautomation.com TEL: +86-0816-2538289 83 / 100...
  • Page 84 http:// www.odotautomation.com TEL: +86-0816-2538289 84 / 100...
  • Page 85 7. Firmware upgrades The gateway supports network port upgrade, and when the module firmware is updated, the module firmware needs to be upgraded. Upgrade software: IO Config 1.after the installation is complete, open the software, click the Tools——Search the devices or shortcut icon, in the pop-up window, select the local network card, Click the Search, in the list of Devices, select a device with PN-MBL V2.0 and click Update.
  • Page 86 Click ,in the pop-up interface, select the new firmware file and click to open, the new firmware information will be displayed in the lower left corner. Select the 0# coupler, hit "√", click to start the upgrade, and click to run the APP when finished.
  • Page 87 http:// www.odotautomation.com TEL: +86-0816-2538289 87 / 100...
  • Page 88 8.Appendix 8.1. Modbus-RTU Introduction to Agreement For you, you only need to understand that Modbus has 8 important function codes corresponding to 4 areas: 4 for reading, 2 for writing a single bit or register, and 2 for writing multiple bits or multiple registers. (Address description uses PLC address) 8.2 Modbus Storage area The storage area of the controller (or Modbus device) involved in Modbus is identified by 0XXXX, 1XXXX, 3XXXX, 4XXXX.
  • Page 89 0x11 0x01 0x00 0x13 0x00 0x25 xxxx Function: Read the 0XXXX status of the slave output coil. Note: The start address of the coil of some equipment is 00000, which corresponds to the address 00001 in the equipment, which is sequentially extended. This example: read the output coil of slave station 0x11, the register start address is 0x13=19, the number of coils is 0x0025H=37;...
  • Page 90 addre functio Byte n code count 10196-10203 10204-10211 10212-10217 0x11 0x02 0x03 0xAC 0xDB 0x35 xxxx Function: Slave machine returns to input coil 1 XXXX state (3) Read output/holding register Function code：03H Master inquiry message format: High addres functio Register start Register start register register...
  • Page 91 0x11 0x04 0x00 0x08 0x00 0x01 xxxx Function: Read the value of slave station input register 3XXXX. Note: In some devices, the register start address 30000 corresponds to the address 30001 in the device, and it is extended sequentially. This example: Reading the value of the input register of slave station 0x11, starting at 0x0008H Note: In some devices, the starting address of the register 30000 corresponds to the address 30001 in the device, and it is extended sequentially.
  • Page 92 Example: The starting address is 0x00AC=172. Force the No. 17 slave coil 0172 to Response format: original text return Function: Force No. 17 slave coil 0172 ON to return the original text （6）Preset single holding register Function code：06H addre functio Coil address Disconnec Disconn...
  • Page 93 coil coil numbe numbe Coil start start Coil addres functio r of r of Byte state addres addres state n code coils coils count 20-2 28-29 high high 0x11 0x0F 0x00 0x13 0x00 0x0A 0x02 0x00 xxxx Function: Force multiple continuous coils 0XXXX to ON/OFF state. Note: In some devices, the coil start address 00000 corresponds to the address 00001 in the device, which is sequentially extended.
  • Page 94 This example: preset multiple holding register values of slave station 0x11, the starting address of the register is 0x0087=135, and the number of coils is 0x0002=2. Therefore, the function of this query message is: preset the values of 2 holding registers of the slave station of No.
  • Page 95 8.2. Brief introduction of serial network topology 8.2.1 RS232 RS232 is one of the serial communication interfaces of industrial control, and it is widely used to connect computer serial interfaces and peripherals. RS232 uses a signal line and a signal return line to form a common ground transmission form. The three-wire connection method can realize full-duplex communication.
  • Page 96 Name Effect Carrier detect Receive data Receive data Data terminal is ready Signal ground Data ready Request to send Clear to send Ring alert Because the RS232 interface has the above-mentioned electrical characteristics, it can only realize point-to-point communication. The RS232 communication wiring diagram is shown in the figure: 8.2.2 RS422 The full name of RS422 interface standard is "Electrical Characteristics of Balanced Voltage Digital Interface Circuit", which defines the characteristics of the interface...
  • Page 97 connected. That is, a master device (Master), and the rest are slave devices (Salve). The slave devices cannot communicate, so RS-422 supports point-to-many two-way communication. The maximum transmission distance of RS-422 is 4000 feet (about 1219 meters), and the maximum transmission rate is 10Mb/s. The length of the balanced twisted pair is inversely proportional to the transmission rate, and the maximum transmission distance is only possible when the rate is below 100kb/s.
  • Page 98 The upper left corner is 1, the lower right corner is 9 The RS422 communication wiring diagram is shown in the figure: 8.2.3 RS485 Since RS-485 is developed on the basis of RS-422, many electrical regulations of RS-485 are similar to RS-422. For example, balanced transmission methods are adopted, and terminating resistors are required to be connected to the transmission line.
  • Page 99 interference during transmission, please use twisted-pair shielded cables as communication cables. The RS485 bus supports a maximum of 32 nodes without relays. The nodes are connected by a "daisy chain" connection. Terminal resistors are required at both ends of the communication cable, and the resistance is required to be approximately equal to the characteristics of the transmission cable.
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