At a Glance

The OUT_IN_MBUS function supports:

• The Modbus codes 1, 2, 3, 4, 5, 6, 15, 16

• The ASCII and RTU modes

• The complete addressing

The OUT_IN_MBUS function is present as a DFB and it must be restarted at each PLC cycle as long as the activity bit is set to 1.

The function is available on Premium PLCs using a TSXSCP111 or TSXSCP114 communication card installed in the processor or a host module (TSXSCY21601 or TSXSCY11601).

Restrictions

On each of the ports, you must not simultaneously activate more than one OUT_IN_MBUS DFB. Similarly, you must not simultaneously use the PRINT_CHAR, INPUT_CHAR or OUT_IN_CHAR blocks.

The OUT_IN_MBUS function does not support:

• changing the parameters of the physical layers or link layers: baud rate, character format, change from RTU to ASCII or the inverse, RS232 signal management

• communication conflicts and errors that may result from the presence of two simultaneously active Modbus masters on the same link

• all operating modes that may result from a fault or a temporary connection with a communication card

• configuration and management of modems