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Siemens S5-135U/155U User Manual

Page 175

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5-35

System Manual
C79000-G8576-C199-06

The controls and indicators are arranged on the front plate of the CPU
module:

CPU 928B

QVZ

ADF

ZYK

BASP

RUN

STOP

RESET

SI2

OVERALL
RESET

Receptacle for
User Memory Submodule

Momentary-Contact Mode Switch

Mode Switch

LEDs (green)

LED (red)

Fault Indicator LEDs (red)

PG Interface, 15-Pin
Interface SI 1

Release Lever

Locking Pin

Order Number and Version

SIEMENS

6ES5928-3UB21

Interface Fault Indicator LED (red)

Interface Fault Indicator LED (red)

Interface 1

Interface 2

Receptacle for Interface Submodule
Interface SI 2

Figure 5-5

Front Plate of the CPU 928B-3UB21

Controls and
Indicators

CPUs, Memory Cards, Memory Submodules, Interface Submodules