Process interfacing via an automation system (PLC, PC)
10.5 Controlling the I/O interface "DI/DO"
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
297
Step Input Output Description
1 DISA=1
TRN=0
TRG=0
RES=0
Program selection is prepared.
DISA must have the value 1. No edge change is necessary.
2 SEL0=1
SEL1=1
SEL2=0
SEL3=1
Select program, for example, program 11.
3 TRD=0
RDY=0
Program selection is started.
5 TRD=1
RDY=1
Program change is completed after approximately 150 ms to 15 s.
Note
If the selected program is not saved, TRD and RDY will retain the value 0.
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