Related Manuals for FMC Technologies Smith Meter microFlow.net Liquid
Summary of Contents for FMC Technologies Smith Meter microFlow.net Liquid
- Page 1 Electronic Preset Delivery System Smith Meter ® microFlow.net Liquid Modbus and Modbus/TCP Communications Bulletin MNFL003 ║ Issue/Rev 0.1 (9/13)
- Page 2 FMC Technologies Measurement Solutions, Inc. FMC Technologies Measurement Solutions, Inc. will not be held responsible for loss of liquid or for damage of any kind or from any cause to the person or property of others, or for loss or profit, or loss of use, or any other special, incidental, or consequential damages caused by the use or misapplication of the contents stated herein.
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Page 3: Table Of Contents
microFlow.net Liquid Modbus Communications Manual Table of Contents Table of Contents 1 – Introduction ................................... 5 1.1 – Modbus/TCP ..................................5 1.2 – Floating Point Endian Control .............................. 6 1.3 – Communications Control Selections............................ 6 1.4 – Configuring the microFlow.net Liquid for Modbus Communications via Serial Port ............6 1.5 –... - Page 4 microFlow.net Liquid Modbus Communications Manual Table of Contents 4.6 – Query Responses ................................27 4.61 – Byte Count ..................................27 4.62 – Data Register................................... 27 4.7 – 01 Read Relay Status................................ 28 4.8 – 02 Read Input Status ................................. 29 4.9 –...
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Page 5: Introduction
microFlow.net Liquid Modbus Communications Manual Introduction 1 – Introduction The Modbus protocol was developed by Modicon, Inc. to be a concise method of transferring data to/from programmable logic controllers (PLCs). It has become a de-facto standard in many areas of industrial automation where supervisry control or remote data collection is required. -
Page 6: Floating Point Endian Control
microFlow.net Liquid Modbus Communications Manual Introduction Floating Point Endian Control Floating-point numbers are not defined in the Modbus specification; there are nearly as many variations of how it is supported as there are vendors. Most often, Modbus registers are combined sequentially to make up an IEEE single precision or double precision floating point number;... -
Page 7: Configuring The Microflow.net Liquid For Modbus Communications Via Tcp/Ip (Ethernet Or Slip)
microFlow.net Liquid Modbus Communications Manual Introduction Mode – dependent on EIA 232/EIA 485 wiring configuration. Must match the master device. • Return to the Main Menu by pressing the <Clear> key. Configuring the microFlow.net Liquid for Modbus Communications via TCP/IP (Ethernet or SLIP) •... -
Page 8: Implementing Remote Host Functionality
microFlow.net Liquid Modbus Communications Manual Implementing Remote Host Functionality 2 – Implementing Remote Host Functionality Implementing Host Status Polling To implement routine polling loops, the following coils should be periodically read. These coils represent the critical states that a host should monitor. Coil State In Program Mode –... -
Page 9: Program Mode Interface-Entering Program Mode Via Modbus
microFlow.net Liquid Modbus Communications Manual Implementing Remote Host Functionality 09 Alarm Condition 10 Storage Full 11 Operation Out Of Sequence 12 Power Failed During Transaction 13 Already Authorized 14 Program Code Not Used 15 Display/Keypad In Remote Mode 16 Ticket Not In Printer 17 No Keypad Data Pending 18 No Transaction In Progress 19 Option Not Installed/Enabled... -
Page 10: Set Time/Date
microFlow.net Liquid Modbus Communications Manual Implementing Remote Host Functionality 2.25 Set Time/Date To set the date and time via Modbus, write the following holding registers (Function 3): 7688 (30344) Time Set - Year, 4 digit 7689 (30345) Time Set - Month 768A (30346) Time Set - Day 768B (30347) Time Set - Hour 768C (30348) Time Set - Minute... -
Page 11: Batch Preset/Authorization Options
microFlow.net Liquid Modbus Communications Manual Implementing Remote Host Functionality Bit# Bit 31 . . . Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value Recipe Example: If recipes 3 and 5 are the only valid recipes for this load, the value to write to this register prior to authorization would be: (5-1) (3-1) -
Page 12: Read Event Log
microFlow.net Liquid Modbus Communications Manual Implementing Remote Host Functionality 2.32 Read Event Log To read historical events from the event log, the following steps are used. The most recent event log entry’s sequence number is available via Function 4, registers 1792- 1793 (unsigned long integer). -
Page 13: Modbus Register Reference
microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 3 – Modbus Register Reference 2577 (0A11) VF: Valve Fault Alarm 2578 (0A12) BP: Back Pressure Alarm 2579 (0A13) TP: Temperature Probe Alarm ------------------------------------------------------------------------ 2580 (0A14) DR: Density Transducer Failure INPUT (STATUS) COILS - Function 2 2581 (0A15) PR: Pressure Transducer Fail... - Page 14 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference ------------------------------------------------------------------------ Directory: SYSTEM_DIR Program Configuration, etc. - HOLDING REGISTERS Data Type: FLOATING POINT - Function 3,6,16 table: Start Address: 6912 ----------------------------------------------------------- 6912 (1B00) 102 Pulse Out 1 Pulses/Amount Dec. Hex. Parameter # and Description 6914 (1B02) 104 Pulse Out 1 Max Frequency...
- Page 15 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference Directory: SYSTEM_DIR 13830 (3606) 635 High Temperature Alarm 13831 (3607) 636 Low Temperature Alarm Data Type: UNSIGNED_LONG 13832 (3608) 637 Temp Transducer Alarm 13833 (3609) 638 High Density Alarm Start Address: 7936 13834 (360A) 639 Low Density Alarm 7936...
- Page 16 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 17933 (460D) 712 Comm 2 Mode 21250 (5302) 203 Low Flow Start Amount 17934 (460E) 718 Comm 3 Mode 21252 (5304) 204 Low Flow Start % of Batch 21254 (5306) 223 Overrun Alarm Limit Directory: COMM_PORT_DIR Directory: LOAD_ARM_DIR Data Type: UNSIGNED_INTEGER...
- Page 17 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference Directory: METER_DIR Directory: PRODUCT_DIR Data Type: UNSIGNED_INTEGER Data Type: UNSIGNED_CHAR Start Address: 24192 Start Address: 26112 26112 (6600) 351 Meter Factor Variation Select 24192 (5E80) 304 Dual Pulse Error Count 26113 (6601) 412 API Table 24193 (5E81) 366 SMASS Density Factor...
- Page 18 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 30350 (768E) Time Set - 0=MIL,1=AM,2=PM Number Back (0=current) 40588 (9E8C) Recipe Index to Read/Write (1-4) Directory: SYSTEM_CMDS ------------------------------------------------------------------------ Data Type: UNSIGNED_LONG Start Address: 30464 ******Start of Function 4***** - STATUS REGISTERS - Function 4 table: 30464 (7700) Request Event Log Entry ------------------------------------------------------------------------...
- Page 19 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 2160 (0870) 8th Alarm in Transaction 3088 (0C10) Mass 2176 (0880) 9th Alarm in Transaction 3092 (0C14) Additive 1 Volume 2192 (0890) 10th Alarm in Transaction 3096 (0C18) Additive 2 Volume 2208 (08A0) 11th Alarm in Transaction 3100 (0C1C) Additive 3 Volume...
- Page 20 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 3852 (0F0C) Current Prompt Response Data 1 Directory: BATCH_RUN_DATA 3854 (0F0E) Current Prompt Response Data 2 Data Type: UNSIGNED_CHAR 3856 (0F10) Current Prompt Response Data 3 3858 (0F12) Current Prompt Response Data 4 Start Address: 5632 3860 (0F14) Current Prompt Response Data 5...
- Page 21 microFlow.net Liquid Modbus Communications Manual Modbus Register Reference 11264 (2C00) Additive 1 Non-resettable Total Start Address: 15104 11268 (2C04) Additive 2 Non-resettable Total 15104 (3B00) Analog Analog Counts 11272 (2C08) Additive 3 Non-resettable Total 15106 (3B02) Analog Raw Value (mA or volts) 11276 (2C0C) Additive 4 Non-resettable Total 15108 (3B04) Analog Engineering Value 15136 (3B20) Analog I/O #2 Analog Counts...
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Page 22: Appendix
microFlow.net Liquid Modbus Communications Manual Appendix 4 – Appendix Modbus Communications Primer The microFlow.net Liquid Modbus interface is designed to conform to a subset of the “Modicon Modbus Protocol Reference Guide” PI-MBUS-300 Rev. D (Modicon, Inc., Industrial Automation Systems). Modbus can be implemented on various transmission mediums (such as RS-232 or RS-485 communication ports). -
Page 23: How Characters Are Transmitted Serially
microFlow.net Liquid Modbus Communications Manual Appendix master to delay twice between messages as long as the duration exceeds the speci- fied delay). 4.12 How Characters are Transmitted Serially When messages are transmitted on standard Modbus serial networks, each character or byte is sent in this order (left to right): With Parity Checking (8 bit word, 1 stop) Start Stop... -
Page 24: Master/Slave Communications
microFlow.net Liquid Modbus Communications Manual Appendix Master/Slave Communications The master communicates with the microFlow.net Liquid by sending messages con- taining function codes. Function codes indicate the actions the microFlow.net Liquid is to perform. The microFlow.net Liquid’s response to the master uses the function code field to report on the status of the task it was assigned. -
Page 25: Beginning Register
microFlow.net Liquid Modbus Communications Manual Appendix Assuming that no error in communication interferes, the data field of a response from a slave to a master contains the requested data. If an error does occur, the field contains an exception code that the application controlling the master can use to determine the next action to be taken. -
Page 26: Field Contents In Modbus Messages
microFlow.net Liquid Modbus Communications Manual Appendix 4.51 Field Contents In Modbus Messages Examples of a Modbus query message and normal response are shown in the tables on the following page. The field contents in both examples are displayed in hexadecimal. In this example, the master sends a Read Holding Registers request to microFlow.net Liquid address 06. -
Page 27: Address
microFlow.net Liquid Modbus Communications Manual Appendix 4.52 Address The address is the first field in the frame and consists of one byte (eight bits) of informa- tion. The address is the unique identification of the microFlow.net Liquid (slave) that is to receive the message that is sent via the supervisory system (master). -
Page 28: 01 Read Relay Status
microFlow.net Liquid Modbus Communications Manual Appendix 01 Read Relay Status Description Reads the ON/OFF status of discrete variables in the microFlow.net Liquid. The maxi- mum number of “coils” per response is 256 in the microFlow.net Liquid. Query The query message specifies the starting register and quantity of registers to be read. There are now no variables to read from this group. -
Page 29: 02 Read Input Status
microFlow.net Liquid Modbus Communications Manual Appendix are contained in the next byte, again from left to right. As the bits are transmitted serially, they flow from LSB to MSB (i.e., 20 through 27, 28 through 35, and so on). In the last data byte, the status of relays 56 through 52 is shown as the byte value 1B hex, or binary 0001 1011. -
Page 30: 03 Read Holdings Registers
microFlow.net Liquid Modbus Communications Manual Appendix The status of inputs 1031 through 1024 is shown as the byte value AC hex, or binary 1010 1100. Input 1031 is the MSB of this byte and input 1024 is the LSB. The status of inputs 1031 through 1024 is expressed as ON-OFF-ON-OFF-ON-ON-OFF-OFF, from left to right. -
Page 31: 04 Read Input Registers
microFlow.net Liquid Modbus Communications Manual Appendix 04 Read Input Registers Description This function reads the binary contents of “input registers” in the microFlow.net Liquid. These are “read-only” values; they cannot be written. Query The query message specifies the starting register and quantity of registers to be read. Registers are addressed starting at zero. -
Page 32: 06 Preset Single Register
microFlow.net Liquid Modbus Communications Manual Appendix An example of a request to force relay 150 ON in microFlow.net Liquid 17 appears below: (Reset User Alarm #9) Query Field Name Example (Hex) microFlow.net Liquid Address Function Relay Address Hi Relay Address Lo Force Data Hi Force Data Lo Error Check (CRC) -
Page 33: 15 (0F Hex) Force Multiple Relays
microFlow.net Liquid Modbus Communications Manual Appendix Response An echo of the query, returned after the register con-tents have been preset, is a normal response. An example of a response to the preceding query appears below: Response Field Name Example (Hex) microFlow.net Liquid Address Function Register Address Hi... -
Page 34: 16 (10 Hex) Preset Multiple Registers
microFlow.net Liquid Modbus Communications Manual Appendix Query Field Name Example (Hex) microFlow.net Liquid Address Function Relay Address Hi Relay Address Lo Quantity of Relays Hi Quantity of Relays Lo Byte Count Force Data Hi (Relays 27-20) Force Data Hi (Relays 29-28) Error Check (CRC) Response The normal response consists of the slave address, function code, starting address,... -
Page 35: Exception Responses
microFlow.net Liquid Modbus Communications Manual Appendix Query Field Name Example (Hex) microFlow.net Liquid Address Function Starting Address Hi Starting Address Lo No. of Registers Hi No. of Registers Lo Byte Count Data Hi Data Lo Data Hi Data Lo Error Check (CRC) Response A normal response consists of the slave address, function code, starting address, and quantity of registerspreset. -
Page 36: How To Access 64-Bit Information Using Modbus When Modbus Will Only Read 32-Bit Information
microFlow.net Liquid Modbus Communications Manual Appendix Accordingly, the application program controlling the master can quickly recognize the exception response and derive the exception code from the data field. Data Field: A normal response consists of any data or statistics in the data field re- quested by the query. -
Page 37: Related Publications
microFlow.net Liquid Modbus Communications Manual Related Publications 6 – Related Publications The following literature can be obtained from FMC Measurement Solutions Literature Fulfillment at measurement.fulfillment@fmcti.com or online at www.fmctechnologies.com/measurementsolutions When requesting literature from Literature Fulfillment, please reference the appropriate bulletin number and title. microFlow.net Liquid Specification ............................ - Page 38 “Contact Us” Corpus Christi, TX USA +1 (361) 289 3400 link in the left-hand column. Kongsberg, Norway +47 (32) 286700 www.fmctechnologies.com/measurementsolutions Printed in U.S.A. © 9/13 FMC Technologies Measurement Solutions Inc. All rights reserved. MNFL003 Issue/Rev. 0.1 (9/13)