Allen-Bradley 1763-L16AWA, Instruction Set Reference Manual

Page: 374 / 616

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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