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The power supply (24V, approximately 100mA) for the keyboard encoder (X4) can be removed
from the monitor. Fitting jumpers in position X33 on the keyboard encoder PCB makes it
possible to select an active or a passive 20mA interface (X1).
1
2
X33
1
2
X33
S1 switch settings for connection to:
Operating Mode
GRACIS-S5
WF 470
GRACIS-PG (PG 750/770)
The white blocks in the banks of switches show the current settings.
In GRACIS- PG mode, the voltage at inputs A and B (X4) determines the keyboards that are
enabled (refer also to the table below). Inputs A and B are continuously monitored.This means
that it is possible to implement a keyboard lock by appropriate assignments of A and B.
A
B
0V
0V
24V
0V
0V
24V
24V
24V
If a programming unit keyboard is connected to X18, it can only be used in
GRACIS-PG mode (switch S1).
4 - 2
3
4
5
6
3
4
5
6
S1
1
ON
OFF
S1
1
ON
OFF
S1
1
ON
OFF
Meaning
No keyboard enabled
Operator panel keyboard enabled
Programming unit keyboard enabled
Operator panel and programming unit keyboards enabled
©
Siemens AG 1992 All Rights Reserved
Passive
WF 470
Active
GRACIS
2
3
4
2
3
4
2
3
4
WS 400-30/WS 400-50 (Description)
X4
A
B
24 V
0 V
6ZB5 440-0KP02
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