Allen-Bradley MicroLogix 1400 Instruction Manual page 427

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Parameter
This Controller Channel
Communication
Command
(500CPU, 485CIF, and
PLC5 message types)
Modbus Command
Data Table Address
Size in elements
Description
Identifies the communication channel. Channel 0, Channel 1 or Channel 2
Specifies the type of message. Valid types are:
• 500CPU Read
• 500CPU Write
• 485CIF Read
• 485CIF Write
• PLC5 Read
• PLC5 Write
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
For a Read, this is the starting address which receives data. Valid file types are B, T, C, R,ST
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 , and RTC (for Modbus commands, B and N only).
Defines the length of the message in elements.
• 1-word elements; valid size: 1...103.
• 2-word elements; valid size: 1...51.
• 8-word RTC elements; valid size: 1
• 42-word String elements; valid size 1...2
• Timer (500CPU and 485CIF), Counter, and Control elements; valid size: 1...34.
• PLC-5 Timer elements; valid size: 1...20
• Modbus bit elements: 1...1920
• Modbus register elements: 1...120
Communications Instructions
Publication 1766-RM001A-EN-P - October 2008
425