Introduction
Parameter
x.00
Parameter
description format
Keypad and
display
Serial
communications
CT Modbus
RTU
PLC Ladder
programming
CTSoft
Parameter
x.00
Advanced parameter
descriptions
Commander SK Advanced User Guide 23
Issue Number: 9 www.controltechniques.com
Exception codes
The following exception codes are supported.
Parameter over range during block write FC16
The slave processes the write block in the order the data is received. If a write fails due to an out of range value then the write block is terminated.
However, the slave does not raise an exception response, rather the error condition is signalled to the master by the number of successful writes field
in the response.
Parameter over range during block read/write FC23
There will be no indication that there has been a value out of range during a FC23 access.
6.1.10 CRC
The CRC is a 16bit cyclic redundancy check using the standard CRC-16 polynomial x16 + x15 + x2 + 1. The 16bit CRC is appended to the message
and transmitted LSB first.
The CRC is calculated on ALL the bytes in the frame.
Code Description
1 Function code not supported
2
Register address out of range, or request to read too many
registers
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