Layout; Front View Of The Module - Siemens SIMATIC S7 Equipment Manual

The SM 338 Module
2.1

Layout

The back
The front
2-2
The SM 338 is installed in a compact, plastic housing. This housing is
mounted on the rail of your programmable controller.
The two plug connectors on the back connect the module to the P bus.
All other connection and indicator elements are located on the front of the
module. Figure 2-1 shows the location of these elements.
LED indi-
cators
External
supply volt-
age (24 V)
X
Slot number
Figure 2-1

Front view of the module

SF
DC
Covering flaps
SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618
Sensors
1 + 3
Sensors
2 + 4