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Allen-Bradley MicroLogix 1400
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Publication 1766-RM001A-EN-P - October 2008
420 Communications Instructions
Modbus
Commands
B, N (command 5) 1-bit 1
B, N (command 6) 1-word 1
B, N
(commands 1, 2, and 15)
1-bit 1920 Modbus bit elements
(120 words)
(Commands 1 and 2 are read
only, 15 is write only.)
B, N
(commands 3, 4, and 16)
multi-register 120 Modbus register elements
(120 words)
(Commands 3 and 4 are read
only, 16 is write only.)
(1) Message Type must be 500CPU or PLC5. The Local File Type and Target File Type must both be Floating Point.
Message Type File Type Element Size Maximum Number
of Elements per Message
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