Fail Save program

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Use of S7-PLCSIM with failsafe programs

How does S7-PLCSIM support failsafe programs?

F-programs are supported directly from V5.2 of S7-PLCSIM onwards. In other words, if S7-PLCSIM V5.2 is installed, the function blocks for your project cannot be replaced by simulation blocks in simulation mode. The "Simulation" button in the "Process safety program" dialog field disappears.

However, certain restrictions continue to apply to the use of S7-PLCSIM V5.2:

· Communication between CPUs is not supported.
· S7-PLCSIM cannot re-initialize the safety program after the "F_SHUTDN" function block is restarted. In this case, the user must re-start S7-PLCSIM.
· In order to load the safety program in S7-PLCSIM V5.2, the user has to install the hardware first, then load the safety program. S7-PLCSIM uses an unchangeable password for the CPU: plcsim (lower-case lettering).
· S7-PLCSIM can be used for S7 F/FH system.
· As from the Distributed Safety Version V5.3 variables of the safety program can be observed and controlled and other write accesses to the safety program can be run. Once the consistent safety program has been loaded into S7-PLCSIM the Safety mode (in the "Safety Program" dialog) must be disabled before controlling the variables. Otherwise S7-PLCSIM might go into STOP.

Also refer to the notes in section 5.4.12 "Testing F-Program with S7-PLCSIM Offline" in the "S7 F/FH Programmable Logic Controllers" manual under Entry ID: 2201072