MVI56E-MNETC ♦ ControlLogix Platform
Procedures
Modbus TCP/IP Multi Client Enhanced Communication Module
Setup Guide
ProSoft Technology, Inc.
Page 41 of 72
April 18, 2011
Configuring the Modbus Client Read Command
The Modbus Read Command reads 10 words of data from the Quantum
processor (Modbus Slave) and transfers it to the MVI56E-MNETC module's
internal database. The following table describes the relationship between
memory addresses in the Modbus Master (MVI56E-MNETC) and the Modbus
Slave (Quantum processor).
MVI56E-MNETC Database Address
Quantum Memory Address
1000
400801
1001
400802
1002
400803
1003
400804
1004
400805
1005
400806
1006
400807
1007
400808
1008
400809
1009
400810
In the sample configuration, the Modbus Read Command is present, but
disabled. To enable the command, change the
E
NABLE
field from No to
Y
ES
,
as
shown in the following illustration.
Notes:
FC 3 represents Modbus Function Code 3, the command code to Read Holding Registers
The DevAddress parameter is 0-based so 800 = 400801, 801 = 400802, and so on.
The Enable code must be set to 1 to enable the command (0 = disable)
The destination Slave node address must be set as 1 (Node parameter)
