ProSoft Technology MVI56E-MCM/MCMXT - Manual (Page 172)

Reference MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 172 of 199 ProSoft Technology, Inc.
June 18, 2014
Code Name Meaning
02 Illegal Data Address The data address received in the query is not an allowable
address for the Slave. More specifically, the combination of
reference number and transfer length is invalid. For a
controller with 100 registers, a request with offset 96 and
length 4 would succeed; a request with offset 96 and length
5 will generate exception 02.
03 Illegal Data Value A value contained in the query data field is not an allowable
value for Slave. This indicates a fault in the structure of the
remainder of a complex request, such as that the implied
length is incorrect. It specifically does not mean that a data
item submitted for storage in a register has a value outside
the expectation of the application program, because the
Modbus protocol is unaware of the significance of any
particular value of any particular register.
04 Slave Device Failure An unrecoverable error occurred while the Slave was
attempting to perform the requested action.
05 Acknowledge Specialized use in conjunction with programming
commands. The Slave has accepted the request and is
processing it, but a long duration of time will be required to
do so. This response is returned to prevent a timeout error
from occurring in the Master. The Master can next issue a
poll program complete message to determine if processing
is completed.
06 Slave Device Busy Specialized use in conjunction with programming
commands. The Slave is engaged in processing a long-
duration program command. The Master should retransmit
the message later when the Slave is free.
6.9 Using the Optional Add-On Instruction
6.9.1 Before You Begin
 Make sure that you have installed RSLogix 5000 version 16 (or later).
 Download the Optional Add-On file
MVI56(E)MCM_Optional_AddOn_Rung_v1_2.L5X from
www.prosoft-technology.com or copy it from the ProSoft Solutions DVD.
 Save a copy in a folder in your PC.
6.9.2 Overview
The Optional Add-On Instruction Rung Import contains optional logic for MVI56E-
MCM applications to perform the following tasks.
 Read/Write Ethernet Configuration
Allows the processor to read or write the module IP address, netmask and
gateway values.