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[ pdf ] Modicon Modbus Protocol Reference Guide

Modicon Modbus Protocol Reference Guide Download
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Topic under  Modbus
Source: www.modbus.org 
File size: 172.26 KB
File type: pdf
Last download on: Thu Mar 29, 2018 02:43:48 PM
Short Desciption:
This guide is written for the person who will use Modicon Modbus protocols and messages for communication in Modicon programmable controller applications. It describes how messages are constructed, and how transactions take place using Modbus protocol.

Summary:
Introducing Modbus Protocol 2 Transactions on Modbus Networks . 4 Transactions on Other Kinds of Networks . 4 The Query–Response Cycle 5 The Two Serial Transmission Modes 6 ASCII Mode . 6 RTU Mode 7 Modbus Message Framing 8 ASCII Framing 8 RTU Framing 9 How the Address Field is Handled 10 How the Function Field is Handled . 10 Contents of the Data Field 11 Contents of the Error Checking Field . 12 How Characters are Transmitted Serially 13 Error Checking Methods 14 Parity Checking . 14 LRC Checking . 15 CRC Checking 16 viii Contents PI–MBUS–300 Chapter 2 Data and Control Functions . 17 Modbus Function Formats . 18 How Numerical Values are Expressed 18 Data Addresses in Modbus Messages 18 Field Contents in Modbus Messages . 18 Field Contents on Modbus Plus 20 Function Codes Supported by Controllers . 22 01 Read Coil Status . 24 02 Read Input Status 26 03 Read Holding Registers . 28 04 Read Input Registers 30 05 Force Single Coil . 32 06 Preset Single Register . 34 07 Read Exception Status 36 11 (0B Hex) Fetch Comm Event Ctr 38 12 (0C Hex) Fetch Comm Event Log . 40 15 (0F Hex) Force Multiple Coils . 44 16 (10 Hex) Preset Multiple Regs 46 17 (11 Hex) Report Slave ID 48 20 (14Hex) Read General Reference . 58 21 (15Hex) Write General Reference . 62 22 (16Hex) Mask Write 4X Register 66 23 (17Hex) Read/Write 4X Registers . 68 24 (18Hex) Read FIFO Queue . 70 PI–MBUS–300 Contents ix Chapter 3 Diagnostic Subfunctions 73 Function 08 – Diagnostics . 74 Diagnostic Codes Supported by Controllers 76 Diagnostic Subfunctions 77 00 Return Query Data 77 01 Restart Communications Option 77 02 Return Diagnostic Register . 78 03 Change ASCII Input Delimiter 81 04 Force Listen Only Mode . 81 10 (0A Hex) Clear Counters and Diagnostic Register . 81 11 (0B Hex) Return Bus Message Count 82 12 (0C Hex) Return Bus Communication Error Count . 82 13 (0D Hex) Return Bus Exception Error Count 82 14 (0E Hex) Return Slave Message Count 83 15 (0F Hex) Return Slave No Response Count 83 16 (10 Hex) Return Slave NAK Count 83 17 (11 Hex) Return Slave Busy Count 84 18 (12 Hex) Return Bus Character Overrun Count . 84 19 (13 Hex) Return IOP Overrun Count (884) . 84 20 (14 Hex) Clear Overrun Counter and Flag (884) . 85 21 (15 Hex) Get/Clear Modbus Plus Statistics . 86 Modbus Plus Network Statistics 87
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