Siemens SIMATIC PP7 Equipment Manual page 13

Pulse diagrams
The following pulse diagrams elucidate the relationship between the actions
initiated on the Push Button Panel and changing bit status in the PLC:
Lamp/Key test The Lamp/Key test serves to test the functional capabilitity of all the keys and
lamps on the Push Button Panel. The Lamp/Key test can be activated by the
following measures in normal operation:
The Lamp/Key test function is assigned to Key 1 (top right) in the pre-adjusted
system settings.
PP7, PP17-I, PP17-II Equipment Manual
Release 06/98
www.gkbpx.com
Function as momentary–contact switch
Key
pressed
not pressed
Bit in
PLC
Contact
closed
Release
input
open
Function as switch
pressed
Key
not pressed
Bit in
PLC
Contact
closed
Release
open
input
By pressing the key assigned to the Lamp/Key test function by the
corresponding parameter.
By setting the two LED bits of the key assigned to the Lamp/Key test
function according to the configuration. The bits must be set in the PLC
using a relevant program.
Time
1
0
Time
1
0
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