DEAR EXPERTS

I am working on PLC s7 (MODBUS Master) & one MODBUS Simulator (Slave). Please find my project in attachment.

When I am trying to READ OUTPUT REGISTER (FC 03 ), TXD & RXD LEDs on CP & my simulator starts flickring but DONE in SEND & NDR in RECV block are parmenently zero.Even ERROR is also zero & not changing.

When I am tryingto READ6 registers from the Simulator , following screen is coming on monitor of simulator.

TX 01 83 02 C0 F1
RX 01 03 00 01 00 06 94 08.

There is also no CRC error on simulator.

I am not able to read anything in intended DB ( DB No.6). I have also tried to read same registers using FC 04 ,but than also same result.

Thanks in advance.

Ambrish