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Author Topic: Modbus and DL protocol  (Read 5746 times)

Henryp

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Modbus and DL protocol
« on: March 24, 2015, 11:23:42 AM »
Can a DM's internal Ethernet port support the Modbus protocol and accept a DL PLC Net WX command on the same port.

franji1

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Re: Modbus and DL protocol
« Reply #1 on: March 24, 2015, 02:08:20 PM »
Can a DM's internal Ethernet port support the Modbus protocol and accept a DL PLC Net WX command on the same port.
Yes.  Master and Slave.  All at the same time.

When DM is the Modbus slave, the Modbus Master will be accessing the following Do-more "Modbus" data-blocks:
MI, MC, MIR, and MHR memory (Modbus Inputs, Modbus Coils, Modbus Input Registers, and Modbus Holding Registers).
Stick 42 in MHR1, and the Modbus Master can read/write to Modbus Holding Register 400001 (the 4 is not really an address, but a "type" designating "Holding Register" with an offset of 1, hence accessing MHR1 in Do-more)

When DM is the DL slave, the remote DL PLC Master will be accessing the following Do-more "DL" data-blocks (yes, they have octal IDs in Do-more):
DLX, DLY, DLC, and DLV.
Stick 42 in DLV2000 and the remote DL PLC can RX V2000 to read that value 42 out of DLV2000 (or write to it via WX V2000).