Terminal Connection Diagram And Block Diagram - Siemens SIMATIC S7-300 Reference Manual

Programmable logic controllers module data

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Terminal Connection Diagram and Block Diagram

Fault indicator – red

Module View and Block Diagram of the SM 338; POS-INPUT

Wiring rules

Please observe the following important rules of the wiring of the module:

• The ground of the encoder supply is connected non-isolated to the ground of

the CPU. Thus, connect pin 2 of the SM 338 (M) with low impedance with the

ground of the CPU.

• The encoder lines (pins 3 to 14) must be twisted pairs and shielded. Apply the

shield to both sides.

For the shield connection to the SM 338, use the shield connection element

(order number 6ES7390-5AA00-0AA0).

• If the output current (900 mA) of the encoder supply is exceeded, then you

must connect an external power supply.

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Voltage monito-

Short-circuit

Special Signal modules

Twisted pair cables

Connection to the

ground of the CPU

DI 0 (Digital-

DC24V (encoder)

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