Siemens Simatic S7-300 Manual - Halaman 10

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Note

A prerequisite for detecting the errors indicated by programmable diagnostic

messages is that you have assigned parameters to the digital module accordingly

in STEP 7.

Behavior upon failure of the supply voltage

The failure of the supply voltage of the SM 321; DI 16

by the SF LED on the module. Furthermore, this information is made available on

the module.

The input value is initially held for 20 to 40 ms before the 0 signal is transferred to

the CPU. Supply voltage dips < 20 ms do not change the process value (see Table

4).

Triggering of the diagnostic interrupt depends on the parameter assignment (see

Section 1.4).

Failure of the supply voltage with redundant incoming supply for the sensor

supply

Note

If an external redundant source is applied simultaneously to the sensor supply

(Vs), a failure in the internal sensor supply causes a failure of the internal and/or

external sensor supply and/or a blown fuse to be indicated instead of a regular

sensor supply failure.

Short-circuit of sensor supply Vs

Irrespective of the parameter assignment, the corresponding Vs LED goes out if a

short-circuit of the sensor supply Vs occurs.

Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

DC 24 is always indicated

A5E00213444-02