Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Digital Modules

3-30

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

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

A failure of the supply voltage of the SM 321; DI 16 x 24 DC is always indicated 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 modify the process value (refer to

Table 3-11).

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

Section 3.9.4).

Failure of the supply voltage with redundant encoder incoming 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 encoder supply Vs occurs.

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