Siemens SIMATIC OEM PP32 - Page 16

1-8
OEM Push Button Panel Equipment Manual
Release 08/98
The following pulse diagrams elucidate the relationship between the actions
initiated on the Push Button Panel and changing bit status in the PLC:
Key
Contact
Release
input
pressed
open
not pressed
closed
Time
Function as momentary–contact switch
Bit in
PLC
1
0
Key
Function as switch
Bit in
PLC
Contact
Release
input
Time
pressed
1
open
not pressed
0
closed
Pulse diagrams
Product Description