Siemens S5-135U/155U System Manual page 175

Controls and
The controls and indicators are arranged on the front plate of the CPU
Indicators
module:
Figure 5-5
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
CPU 928B
Fault Indicator LEDs (red)
QVZ
ADF
Receptacle for
User Memory Submodule
ZYK
BASP
LEDs (green)
RUN
Mode Switch
LED (red)
STOP
RESET
Momentary-Contact Mode Switch
OVERALL
RESET
Interface Fault Indicator LED (red)
Interface 1
PG Interface, 15-Pin
Interface SI 1
Interface Fault Indicator LED (red)
Interface 2
SI2
Order Number and Version
Receptacle for Interface Submodule
Interface SI 2
Release Lever
Locking Pin
Front Plate of the CPU 928B-3UB21
5-35