![background image](http://html.mh-extra.com/html/abb/ec-titanium-ecs100a1h1df4/ec-titanium-ecs100a1h1df4_manual_3515088.webp)
Modbus-RTU Example Connection A-1
MN448
Appendix A
Modbus-RTU Example Connection
Overview
This chapter gives specific details on how to use Modbus RTU as the communication protocol of the IMD. Below you will
find register mapping, telegram structure, and connection details.
ACS255 drives support Modbus RTU communication, allowing a network of drives to be controlled and monitored by any
Modbus RTU capable PLC or control system. The drive is always a Slave to an external Modbus RTU Master. This document
describes the registers and functions available.
A.1 Modbus RTU Communications
Introduction
The IMD can be connected to a Modbus RTU network via the RJ45 connector or the control terminal strip.
A.2 Modbus RTU Specification
Protocol
Modbus RTU
Error check
CRC
Baud rate
9600bps, 19200bps, 38400bps, 57600bps, 115200bps (default)
Data format
1 start bit, 8 data bits, 1 stop bits, no parity.
Physical signal
RS 485 (2-wire)
User interface
RJ45 (see section A.5 for more information)
A.3 RJ45 Connector Configuration
Connection details are shown in section A.5.
A.4 Modbus Telegram Structure
The following Modbus RTU Commands are supported
•
03 Read Holding Registers
•
06 Write Single Holding Register
The telegram structure is as follows:
Command 03 – Read Holding Registers
Command 06 – Write Single Holding Register
Master Telegram
Length
Slave Response
Length
Master Telegram
Length
Slave Response
Length
Slave Address
1
Byte
Slave Address
1
Byte
Slave Address
1
Byte
Slave Address
1
Byte
Function Code (03)
1
Byte
Function Code (03)
1
Byte
Function Code (06)
1
Byte
Function Code (06)
1
Byte
1st Register Address
2
Bytes
Data Length
2
Bytes
Register Address
2
Bytes
Register Address
2
Bytes
No. Of Registers
2
Bytes
1st Register Value
2
Bytes
Value
2
Bytes
Register Value
2
Bytes
CRC Checksum
2
Bytes
2nd Register Value
CRC Checksum
2
Bytes
CRC Checksum
2
Bytes
Etc...
CRC Checksum
2
Bytes
Summary of Contents for EC Titanium ECS100A1H1DF4
Page 1: ... MN448_May 2020 May 2020 EC Titanium Manual User s guide ...
Page 10: ...1 4 Introduction MN448 ...
Page 20: ...3 4 Mechanical Information and Mounting MN448 ...
Page 26: ...4 6 Electrical Installation and Planning MN448 ...
Page 32: ...5 6 Control Pad Wiring and Keypad Interface MN448 ...
Page 36: ...6 4 Keypad Programming and Basic Operation MN448 ...
Page 44: ...8 4 Parameter Navigation and Groups MN448 ...
Page 51: ...9 7 Control Modes MN448 ...
Page 77: ...11 8 Standalone Motor and ABB Drive Setup MN448 ...
Page 99: ...A 12 Modbus RTU Example Connection MN448 ...
Page 102: ......