Siemens Simatic S7-1500 Manual page 36

Simatic s7-1500/et 200mp digital input module f-di 16x24vdc

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Applications of the F-I/O module

5.2 Application 1: Safety mode SIL3/Cat.3/PLd

Parameter assignment

Assign the following parameters for the corresponding channel:

Table 5- 2

Parameter

Sensor evaluation

Supplied channels

Short-circuit test activat-

*) optional. The selection of an internal sensor supply, however, is required for using the short-circuit

test.

Fault detection

The following table presents fault detection according to the sensor supply and the

parameter assignment for the short-circuit test:

Table 5- 3

Fault

Short-circuit of the input with other

channels or other sensor supplies

(short-circuit with other channels is

detected only if they use a different

sensor supply)

Short-circuit between the input and

associated sensor supply

Short-circuit with L+ to DI

Short-circuit with M to DI

Discrepancy error

Short-circuit with L+ to U

Short-circuit with M to U

fective

*) Fault detection only if signals are corrupted. That is, the read signal differs from the sensor signal. If

there is no signal corruption with respect to the sensor signal, fault detection is not possible and is

not required from a safety standpoint.

If the short-circuit test is not activated or the sensor supply to digital inputs is set to

"External sensor supply", the cable must be routed short-circuit proof.

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