LOC/REM For CPU866e using only formulas from Easergy Builder

[DP_BM]

Hi,

I was trying to set up a remote (control with a SCADA) and local (control with HMI) control using only the formulas available in Easergy Builder version 1.7.19 to control a double command of a Saitel 866e CPU.

My initial code works with a current state and a past state for each signal (SCADA/HMI).

The only problem is when:
1.- Going from remote to local
2.- The HMI changes the output signal
3.- Going from local to remote
4.- The SCADA can not change the output signal,
because the past state of the SCADA does not change (only the HMI)

so I have repeated the same value of the current output signal and only in that case the SCADA can "control" the Saitel CPU.

My code is this:

S_SCADA                SCADA          23000:CDC
S_HMI                     HMI                23000:CDC

S_SCADA_L            Logic             IF(NOT(S_SCADA==S_SCADA_E),S_SCADA,0)
S_HMI_L                  Logic            IF(NOT(S_HMI==S_HMI_E),S_HMI,0)
S_OUT                     Logic            IF(S_LOCREM==0,S_HMI_L,S_SCADA_L)                 laq     2031150000

S_SCADA_E            Logic            S_SCADA
S_HMI_E                  Logic            S_HMI

S_SCADA, is the signal form of the SCADA
S_HMI, is the signal form of the HMI
S_SCADA_L, is the logic for the SCADA signal
S_HMI_L, is the logic form of the HMI Signal
S_SCADA_E, is the previous state of SCADA Signal
S_HMI_E, is the previous state of HMI Signal
S_LOCREM, is the signal that switches local/remote control

Any advice or documents I can read to finish this program?

@HenriGRASSET @AndreMelo @Risto_lehto