how to simulate PLC data?

how to simulate PLC data?

Hi,
normaly I receive data via Modbus RTU from the PLC.
Now I have to build a simulation of my ZenOn application. The simulation environment does not contain a PLC. So how can I simulate the PLC data in ZenOn?
thx for help.
Alex

This is a migrated post! Originally posted on 05.03.2009 by user gralex. Please be aware that information can be outdated.