Siemens OP15, Equipment Manual, Page: 96 / 177

13-2
Manual OP5, OP15
( ) J31069-D0840-U001-A2-7618
At most, the activation of two simultaneously pressed keys can be trans-
ferred.
A bit is permanently assigned to every key on the system key board – apart
from the arrow keys and the directory key – in the data area for system key-
board bits. The bit remains set for as long as the corresponding key is
pressed. The bit is reset when you release the key.
Owing to the evaluation of this data area, the operator’s attention can be
drawn to the wrong operation of a key – for example, by means of an error
message.
Transfer of date and time can be initiated from the OP by means of a PLC job
in order to synchronize the OP and PLC.
By creating a suitable data area, it is possible for alarm messages to be ac-
knowledged by the PLC instead of on the OP.
If the PLC is required to announce that an alarm message has been acknowl-
edged, this can be done following creation of a suitable data area.
System keyboard
image
Date and time
PLC
→
OP
acknowledgment
area
OP
→
PLC
acknowledgment
area
Controlling the OP from the PLC