Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 231)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
9-45
Modbus Slave Link Message Parameters
Each Modbus slave link message has a set of parameters as detailed in the table.
Table 33: Modbus Slave Link Message Parameters
Description Value(s) Default Remarks
Command Read Inputs;
Read Coils;
Write Coils;
Read Input Registers;
Read Holding Registers;
Write Holding Registers
Read Coils Command type specifies
the direction of the
message
Slave 1 to 65,536 1 Range of values usable
depends on the slave
device
Master Mimic Depends on command —
see table below
Various
Master 1 to 65,536 1
Count 1 to 2,000 for a Write Coils
message;
1 to 125 for a Write Holding
Registers message
Control 1 to 65,536,
or 0 to disable
The address of a control
register (coil) (†)
0 = enabled
1 = disabled
Note: (†) The 'remarks' here summarize the values allowed for the contents of the
register.
Table 34: Master Mimic Values for Modbus Slave Link Messages
Command Master Mimic Value(s) Default Remarks
Read Inputs Coils Coils
Read Coils Coils Coils
Write Coils Coils;
Inputs Coils
Read Input Registers Holding Registers Holding
Registers
Read Holding
Registers Holding Registers Holding
Registers