Programming manual M238 | 3 MB - BERGER - POSITEC

Adding a Modem
Serial Line Configuration
There is an overlap on simple words of the HMI memory while using double words
but not for the controller memory (see following diagram). In order to have a match
between the HMI memory area and the controller memory area, the ratio between
double words of HMI memory and the double words of controller memory has to be
2.
The following gives examples of memory match for the double words:
%MD2 memory area of the HMI corresponds to %MD1 memory area of the
controller because the same simple words are used by the Modbus request.
%MD20 memory area of the HMI corresponds to %MD10 memory area of the
controller because the same simple words are used by the Modbus request.
The following gives examples of memory match for the bits:
%MW0:X9 memory area of the HMI corresponds to %MX1.1 memory area of the
controller because the simple words are split in 2 distinct bytes in the controller
memory.
For more details about how to add a Modem to the Modbus Manager, refer to the
Adding Modem to a Manager section (see page 148).
Adding the Ethernet Gateway
For more details about how to add a 499TWD01100, refer to the Declaring the
Ethernet Gateway section (see page 150).
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