Publication 1763-RM001B-EN-P - April 2007
374 Communications Instructions
Parameter Description
This Controller Channel Identifies the communication channel. Channel 0 or Channel 1
Communication
Command
(500CPU, 485CIF, and
PLC5 message types)
Specifies the type of message. Valid types are:
•500CPU Read
•500CPU Write
•485CIF Read
•485CIF Write
•PLC5 Read
•PLC5 Write
Modbus Command Specifies the type of message. Valid types are:
•01 Read Coil Status
•02 Read Input Status
•03 Read Holding Registers
•04 Read Input Registers
•05 Write Single Coil
•06 Write Single Register
•15 Write Multiple Coils
•16 Write Multiple Registers
Data Table Address
For a Read, this is the starting address which receives data. Valid file types are B, T, C, R,ST
(3)
N, and L (for Modbus commands, B and N only).
For a Write, this is the starting address which is sent to the target device. Valid file types are
O, I, B, T, C, R, N, L, ST
(1)
(3)
, and RTC
(1)(2)
(for Modbus commands, B and N only).
Size in elements Defines the length of the message in elements.
•1-word elements; valid size: 1 to 103.
•2-word elements; valid size: 1 to 51.
•8-word RTC elements; valid size: 1
•42-word String elements; valid size 1 to 2
•Timer (500CPU and 485CIF), Counter, and Control elements; valid size: 1 to 34.
•PLC-5 Timer elements; valid size: 1 to 20
•Modbus bit elements: 1 to 1920
•Modbus register elements: 1 to 120
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