Siemens SIMATIC PP7 Equipment Manual page 14

On activating the Lamp/Key test, the unit switches to the corresponding oper-
ating mode. In this case
After pressing any key when in operating mode Lamp/Key test,
This is valid for the period in which the key is pressed. All the keys and digital
inputs can be tested in this way.
In order that no unwanted signals are transmitted to the PLC during the Lamp/
Key test, the following restrictions are valid in respect of Push Button Panel
operation:
The last key operation reported to the PLC is the pressing of the Lamp/Key test
button.
To terminate the Lamp/Key test,
The unit returns to normal operation and the restrictions regarding the Push
Button Panel operation are released.
1-6
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the ERROR LED blinks,
the LEDs integrated in the Push Button Panel keyboard are activated,
all the Push Button Panel digital outputs are set to 1.
the LED/lamps go out for the period in which the key is pressed,
all the Push Button Panel digital outputs are set to 1.
the inputs are locked and no signal exchanges are reported to the PLC,
the last status of all the keys is maintained by the PLC until normal
operation returns.
release the corresponding key, or
reset the corresponding bits in the PLC
PP7, PP17-I, PP17-II Equipment Manual
Release 06/98
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