Modbus Communication

Hi
I am a novice in plc world. I would like to communicate over the modbus with AB (Compact Logic, MicroLogic) PLCs with the modbus slave devices. I know Compact Logic,and MicroLogic dont suppport modbus communication unless we use a prosoft module with them. My question is, is there a way we can program in the ladder logic to make Compact Logic or MicroLogic work over modbus without a prosoft hardware. if such a way exist, is there any example code i can play with and try to learn. Any help and suggestions will be appreciated. Thanks in advance.

PLC Novel

I am not sure about the CompactLogix but the MicroLogix does support modbus. See attached

ML1500 LRP series C processor - CH. 1 Modbus RTU Master or Slave

ML1500 LRP series B procuessor - CH. 1 Modbus RTU Slave

ML1200R (dual comm ports) series C processor - CH. 0 master or slave

ML1200 series A/B processor - CH. 0 Slave only

CompactLogix - must use Prosoft module

Modus communication

Hi
Thanks for your replys. So it means there is no software way of implementing a Modbus protocol in Compactlogic without using a Prosoft module.