Register Addressing for Modbus TCP/IP while using Access Variables

We have a requirement wherein we need to send data to a Modbus TCP master from the register address 30001 and receive data from the master at the register address 40001 using access Variables. We noticed that the Access variables accepts only %MW and %MX addressing formats and does not accept any other addressing formats like %IW or %QW etc. So how do we differentiate between 30001 and 40001, while providing the register addresses at the access variables?

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Nishanth Mathew Rank: 338

Asked 1 year ago

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Hi,
I assume, you are using AC800M/CI867 as Modbus Slave configuration.

The following examples show how to address Holding/Input register address 45 (decimal):

%MW10#45 (Decimal)

%MW8#55 (Octal)

%MW16#2D (Hexa-Decimal)

Just try to use different range for send and receive, since CI867 is slave, address definition usually will be done on slave devices.

Lets say 1 to 1000 for send data range,
2000 to 3000 for receive data range

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