Siemens SIMATIC MV500 Operating Instructions Manual page 178

Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
Table 9- 39
Step
1
2
3
5
If the selected program is not saved, "TRD" and "RDY" will retain the value "0".
178
Program selection procedure
Input Output Description
DISA = 1 Program selection is prepared.
TRN = 0 DISA must have the value "1". No edge change is necessary.
TRG = 0
RES = 0
SEL0 = 1 Select program, for example, program 11.
SEL1 = 1
SEL2 = 0
SEL3 = 1
TRD = 0 Program selection is started.
RDY = 0
TRD = 1 Program change is completed after approximately 150 ms to 15 s.
RDY = 1
Operating Instructions, 03/2021, C79000-G8976-C494-05
SIMATIC MV500