Modbus Slave

Dear all,

I am new to the ET200S Modbus communication.

We have 6ES7138-4DF11-0AB0 Serial Interface Modbus module with ET200S IM 158 CPU .

We have to Configure the Modbus module as a slave Device for Receiving and transmitting the signals to CCR room which has Master S7-400 PLC,in ET200S CPU with slave modulei configured slave address andparameters,what are the Programming procedure to be done and any functional blocks to be use in the slave side PLC ?

If refered the example programme itrepresents written for Modbus master module so for slave operation any example programme is there.

The signals for communiction is few binary signals ( For slave device 3 binary inputs and 3 binary outputs only ). how to tell & receive the signals from the master ?

Attached herewith is our Hardware configuration.

Thanks &regards,
kk