531X160HFCACG1 GE Controller Encoder Process Board

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A Message Control Block (MCB) is a block of registers which defines the

Modbus/RTU message commands that are to be executed by the RTM with each

slave. A block of six registers is required for each MCB. If a single read command

and single write command is to be executed with each of six slaves, a total register

block of 72 registers (6 slaves x 6 registers x (1 read + 1 write)) must be allocated
for MCBs. As with SCBs, block moves are the most straight forward coding approach

for MCBs.Following is a pair of MCBs which represent a“read holding registers”

command 7 words long, and a“preset multiple registers”command 2 words long.

Both of these commands are directed at the slave withStation ID 1.

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