Simulating Pid_Compact V1 With Plcsim - Siemens SIMATIC S7-1200 Function Manual

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Using PID_Compact

4.3 PID_Compact V1

Simulating PID_Compact V1 with PLCSIM

Simulation with PLCSIM

For the simulation with PLCSIM, the time behavior of the simulated PLC is not exactly

identical to that of a "real" PLC. The actual cycle clock of a cyclic interrupt OB can have

larger fluctuations with a simulated PLC than with "real" PLCs.

In the standard configuration, PID_Compact determines the time between calls automatically

and monitors them for fluctuations.

For a simulation of PID_Compact with PLCSIM, for example, a sampling time error (ErrorBits

= DW#16#00000800) can therefore be detected.

PID_Compact switches to "Inactive" mode (State = 0) in this case.

To prevent this from happening, you should configure PID_Compact for simulation with

PLCSIM as follows:

• sb_EnCyclEstimation = FALSE

• sb_EnCyclMonitoring = FALSE

• sPid_Calc.r_Cycle: Assign the cycle clock of the calling cyclic interrupt OB in seconds to

Function Manual, 03/2017, A5E35300227-AC

Simatic s7-1500