Siemens SIMATIC HMI OP3 Equipment Manual page 92

Device Description
Figure 15-4 Configuration of the Interconnecting Cable
15.3 Contrast Control
Adjusting the At the rear of the OP3, next to the symbol
display contrast
potentiometer screw which is turned left or right to adjust the display
contrast.
Figure 15-5 Contrast Control
15-4
OP3
1
Code
M24V 2
RS485 line B 3
4
RTSAS
5
M5V
NC 6
P24V 7
8
RS485 line A
NC 9
Contrast control
2,5 m cable SIMATIC S7
1
NC
2 M24V
3 RS485 line B
4
RTSAS
5
M5V
6 P5V
7 P24V
8
RS485 line A
9 NC
Shield
there is a countersunk
Operator Panel OP3
Edition 11/99