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Summary of Contents for WEG CFW320
- Page 1 Motors | Automation | Energy | Transmission & Distribution | Coatings Modbus RTU CFW320 User’s Guide...
- Page 2 Modbus RTU User’s Guide Series: CFW320 Language: English Document: 10009156417 / 00 Build 232 Publication Date: 03/2022...
- Page 3 SUMMARY OF REVISIONS The information below describes the reviews made in this manual. Version Revision Description First edition...
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Page 4: Table Of Contents
2.1 RS485 COMMUNICATION MODULE (CFW320-CRS485) ........ -
Page 5: About The Manual
ABOUT THE MANUAL This manual supplies the necessary information for the operation of the CFW320 frequency inverter using the Modbus RTU protocol. This manual must be used together with the CFW320 user’s manual and programming manual. ABBREVIATIONS AND DEFINITIONS ASCII... -
Page 6: Main Characteristics
These modes define the way the message bytes are transmitted. It is not possible to use the two transmission modes in the same network. The CFW320 frequency inverter uses only the RTU mode for the telegram transmission. It allows up to 247 slaves, but only one master. -
Page 7: Interface Description
INTERFACE DESCRIPTION 2 INTERFACE DESCRIPTION The interfaces for serial communication RS485, RS232 or USB available for the CFW320 frequency inverter depend on the selected communication module for the product. Following are presented information about the connection and installation of the equipment, using different communication modules. -
Page 8: Terminating Resistor
Enable the termination resistors only at two points, at the extremes of the main bus, even if there are derivations from the bus. 2.2 USB COMMUNICATION MODULE (CFW320-CUSB) Figure 2.2: Module with USB connection For this module, a USB interface with mini-USB conector is available. When connecting the USB interface, it will be recognized as a USB to serial converter, and a virtual COM port will be created . -
Page 9: Indications
2.3.3 Connection to the RS232 Network For the connection of the CFW320 frequency inverter using the RS232 interface, the following points must be observed: The frequency inverter RX and TX signals must be connected respectively to the master TX and RX, besides the connection of the reference signal (GND). -
Page 10: Installation Of The Equipment In Network
INSTALLATION OF THE EQUIPMENT IN NETWORK 3 INSTALLATION OF THE EQUIPMENT IN NETWORK For the connection of the frequency inverter CFW320 using the RS485 interface, the following points must be observed: 3.1 COMMUNICATION RATE The RS485 interfaces of the CFW320 frequency inverter can communicate using the rates defined on the Table 3.1... -
Page 11: Recommendations For Grounding And Cable Passage
Use fastening clamps in the main grounding point, allowing a greater contact area between the cable shield and the grounding. Avoid connection of the cable in multiple grounding points, especially where groundings of different potentials are present. CFW320 | 11... -
Page 12: Parameters
The inverter status word is unique for all the sources and can only be accessed for reading. It indicates all the relevant operating status and modes of the inverter. The function of each bit of P680 is described in Table 4.1 on page CFW320 | 12... - Page 13 2048 (0800h), then, to obtain the value in Hz one must calculate: 8192 => 60 Hz 2048 => Frequency 2048 x 60 Frequency = 8192 Frequency = 15 Hz Negative values in this parameter indicate that the motor is running in the reverse direction. CFW320 | 13...
- Page 14 To enable the use of the reference written in this parameter, the product must be programmed to use the speed reference via communication network. This is programming is done using parameters P221 and P222. This word uses a 13-bit resolution with signal to represent the motor rated frequency (P403): CFW320 | 14...
- Page 15 1: DO1 output closed. Bit 1 0: DO2 output open. 1: DO2 output closed. Bit 2 0: DO3 output open. 1: DO3 output closed. Bit 3 0: DO4 output open. 1: DO4 output closed. P696 - AOx Value 1 CFW320 | 15...
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Page 16: Modbus Rtu
P310 - Serial Baud Rate Adjustable 0 = 9600 bits/s Factory Range: 1 = 19200 bits/s Setting: 2 = 38400 bits/s 3 = 57600 bits/s 4 = 76800 bits/s Properties: Description: CFW320 | 16... - Page 17 0 ... 1 = Reserved Not available. 2 = Modbus RTU Slave Slave Modbus RTU serial protocol. 3 = BACnet Bacnet serial protocol. 4 = Reserved Not available. 5 = ModBus RTU Master Master Modbus RTU serial protocol. CFW320 | 17...
- Page 18 After being powered up, the frequency inverter starts counting this time from the first received valid telegram. The value 0.0 disables this function. P316 - Serial Interf. Status Adjustable 0 = Inactive Factory Range: 1 = Active Setting: 2 = Watchdog Error Properties: CFW320 | 18...
- Page 19 0 = Inactive Serial interface without valid data traffic. 1 = Active Serial interface with valid data traffic. 2 = Watchdog Error The serial interface is active, but a serial communication error has been detected - A128 alarm/F228 fault. CFW320 | 19...
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Page 20: Operation In The Modbus Rtu Network - Slave Mode
It allows accessing all the markers and data used in the ladder program of the CFW320 frequency inverter. 5.1 AVAILABLE FUNCTIONS In the Modbus specification are defined the functions used to access different types of data. In the CFW320, in order to access those data the following services (or functions) have been made available: Table 5.1: Supported Modbus Functions... -
Page 21: Memory Markers
Besides the parameters, other types of data as bit markers, word or float, can also be accessed using the Modbus protocol. Those markers are used mainly by the SoftPLC function, available for the CFW320. Refer to the SoftPLC documentation for the description of those markers, as well as for the addresses via Modbus. -
Page 22: Startup Guide
STARTUP GUIDE 6 STARTUP GUIDE The main steps to start up the CFW320 frequency inverter in Modbus TCP network are described below. These steps represent an example of use. Check out the specific chapters for details on the indicated steps. -
Page 23: Quick Reference Of Alarms And Faults
(P049) and disabling the motor. They can only be reset with a reset command or de- energizing the frequency inverter. Alarms operate by indicating their occurrence on the HMI and in the present alarm parameter (P048). They are automatically reset when the alarm condition ceases existing. CFW320 | 23... - Page 24 WEG Drives & Controls - Automation LTDA. Jaraguá do Sul - SC - Brazil Phone 55 (47) 3276-4000 - Fax 55 (47) 3276-4020 São Paulo - SP - Brazil Phone 55 (11) 5053-2300 - Fax 55 (11) 5052-4212 automacao@weg.net www.weg.net...
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