Siemens SIMATIC ET 200SP Manual page 33

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 with L+ to
DI
n
Short circuit with M to
DI
n
Discrepancy error
Short circuit with L+ to
VS
Short circuit with M to
VS
*) Fault detection only if signals are corrupted. That is, the read signal differs from the sensor signal. If
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.
Digital input module F-DI 8x24VDC HF (6ES7136-6BA00-0CA0)
Manual, 07/2013, A5E03858068-01
Fault detection
Internal sensor supply and
short circuit test activated
n
or defective
n
there is no signal corruption with respect to the sensor signal, fault detection is not possible and is
not required from a safety standpoint.
WARNING
5.2 Application 1: Safety mode SIL3/Cat.3/PLd
Fault detection
Internal sensor supply and
short circuit test
yes*
yes
yes*
—
yes
yes
Applications of the F-I/O module
External sensor
deactivated
no
no
yes*
—
no
yes
supply
no
no
no
—
—
—
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