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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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Moore Automation is a company specializing in the sales of modules and spare parts for world-renowned brands (DCs systems, robot systems, large servo control systems). The company's products include: distributed control systems (DCS), programmable controllers (PLC), MOTOROLA -MVME industrial modules, industrial control communication converters (Anybus), remote output/input modules (RTU), industrial computers (PC), industrial low-frequency screens (IPC), human-machine interface SCSI (50, 68, 80Pin ) AnyBus(Gateway)o The spare parts we sell provide one-year quality guarantee and have undergone strict testing and certification. Now we have become a global sales enterprise of industrial automation spare parts and components.