Siemens SIMATIC ET 200S Handmatig - Pagina 26

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Connecting

5.2 Wiring unused channels of the analog input modules

Sensor selection

Note the following factors when selecting the sensors:

● Length, impedance, and capacitance of the cable

● Reaction speed of the utilized sensors

5.2

Wiring unused channels of the analog input modules

Rules

Pay attention to the following instructions when wiring unused channels:

● "Deactivate" unused input channels when assigning parameters.

● A deactivated channel always returns the value 7FFF

● The cycle time remains unchanged at 250 µs.

5.3

Rules

To prevent interference we recommend the following for analog electronic modules:

● Use shielded wires to the sensors and actuators.

● Lay out the wire shields on the shield connection.

● Connect the shield connection to the ground bus with low impedance.

Note

The permitted limit values can be exceeded (up to <10%) at the measuring inputs of the

electronic module in the event of cable-related HF radiation up to 100 kHz. This is made

necessary by the specified measuring procedure.

2AI I 4WIRE HS analog electronic module (6ES7134-4GB62-0AB0)

Manual, 01/2008, A5E01076124-02