2-9
PP7,
PP17-I, PP17-II Equipment Manual
Release 06/98
2.3 Configuring
Keys/LEDs
The
switches and keys need only be configured when a configuration deviating
from the predefined system settings is required.
The following parameters can be adjusted for the Push Button Panel:
Parameter Description
Pulse exten
-
sion
The signal pulse regarding all operations initiated by pressing
buttons on the PLC is extended in order to ensure reliable
switch/key polling by the PLC even when pressed very
briefly.
The extension of the signal pulse results from:
Pulse = Entered value x 20 ms
V
alue range: 0 to 50
System default setting: No pulse extension
Lamp/Key
test
A key on the keyboard is assigned for activating the Lamp
test. The parameter indicates the number of the key which is
assigned the Lamp test function. The keys are numbered
from right to left, in rows, beginning at the top right moving
down. The value 0 deactivates the Lamp test.
V
alue range: 0 to total number of keys
System default setting: Lamp test assigned to Key 1 (top
right)
Function
keys
It is possible to define whether a key on the keyboard should
function as a key or switch.
Function momentary–contact switch:
The corresponding bit in the PLC is set
as long as the key is pressed.
Function switch:
Pressing the key sets the corresponding
bit, pressing again resets it.
The way in which each key functions is defined by a single
bit. The keys are numbered from right to left, in rows, begin
-
ning at the top right moving down, so that the first bit in the
configuration is designated for the key at the top right and the
last bit for the key at the bottom left.
Bit = 0:
Function momentary–contact switch
Bit = 1:
Function switch
System default setting: All the keys are configured as keys.
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