Siemens Simatic S7-1500 Manual page 46

Applications of the F-I/O module
5.4 Application 3: Safety mode SIL3/Cat.4/PLe
Parameter assignment
Assign the following parameters for the corresponding channel:
Table 5- 8
Parameter
Sensor evaluation
Supplied channels
Short-circuit test activat-
ed
*) 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- 9
Fault
Short-circuit within the channel pair,
with other channels or other sensor
supplies
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
*) Fault detection only if signals are corrupted. That is, the read signal differs from the sensor signal
(discrepancy error). 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.
46
Parameter assignment
Channel with internal sensor supply
1oo2 evaluation, non-equivalent
Channels [x...y]
Disable
•
Enable*
•
Fault detection
n
n
Sn
or defective
Sn
Channel with external sensor supply
None
Disable
Fault detection
yes* / yes (for channel whose short-circuit test is activated)
Yes, if internal sensor supply is used and short-circuit test
activated
Yes, if internal sensor supply is activated
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Yes
Yes*
Yes
Manual, 01/2016, A5E03858068-AA