how to give a modbus address of a variable for example m0.0 or mw100 in s7-1200 .

thank you..

Hello,

pls describe better your situation, what devices you have on network, which is Master/Slave.

 Hello.

OTOMATE

how to give a modbus address of a variable for example m0.0 or mw100 in s7-1200 .

thank you..

Assuming the S7-1200 is the slave: The "Modbus slave" instruction maps the Modbus address to relevant PLC memory. this is done in block sizes and not single bits.

Have a look at the example:
https://support.industry.siemens.com/cs/ae/en/view/47756141

Regards.