schmersal PSC1-C-10 Series Installation Manual page 40

Installation manual
Sensors / input elements with 2-pole or multiple pole contacts with time monitoring:
Same check as before however with the additional monitoring of the input signals for consistency of
the defined level relationships within a time window of 3 s. If the levels differ for a period > 3 s, a
module alarm is triggered.
Start-up testing:
Each time the safety module is switched on (=PSC1 module), the input element must be tested in the
low signal status direction (= defined safe status), e.g. actuation of the emergency stop button or a
door lock after system start.
Operative / organisational tests:
Beyond the diagnostic measures on the PSC1 modules stated above, cyclic testing can be undertaken
in the application. These tests can be used in the assessment of the DC.
Note:
The operative/organisational tests can also be used for a combination of hardware inputs and
functional inputs (input information transmitted via standard fieldbus). The exclusive usage of
functional inputs is however excluded in this respect (combination of two or more functional inputs)
The PSC1 modules therefore provide wide-ranging diagnostic functions for the input sub-system.
These are designed as continuous, or optional (cross-circuit monitoring using pulse detection).
PSC1-C-10 Installation manual V2.6 Page 40 of 173
Version: 57E