file number of 6x register

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Thread Starter

Takahiro

Someone who knows well about Controllers of Modicon, please tell me about them.

Can PLC of Modicon as Modbus Master access to extended file register in a big file number like No.60000 on Modbus Slave with Func.Code 20 or 21?

For example, Modicon's 140 CPU 534 14A module has only 10 files. Doesn't it mean that this module can access to within only 10 files of extended file register on Slave?
 
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Robert Carlin

Modbus reads and writes to the "Holding" registers. "40001" is not part of the Modbus function but simply Reg 0001 and the Slave will reply with 40001. The 60000 were for data storage in the controller and had to be moved in and out of the 40000 registers
 
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