schmersal PSC1-C-10 Series Installation Manual page 41

Installation manual
For the safety-related assessment of the overall system, it is therefore possible in principle to use the
following diagnostics for the input sensors:
Characteristics Tests that can be configured
of the input
element
Single-channel
X
X
Dual-channel
X
Options:
X: Diagnostic measure activated
O: At least 1 diagnostic measure activated
PSC1-C-10 Installation manual V2.6
Version: 57E
/ operative tests
O O
O O
O O
X
DC Definition of the measure
Cyclic test stimulus by dynamic
>60
change of input signals
Cyclic test stimulus by dynamic
90
change of input signals
Cyclic test stimulus by dynamic
change of input signals
90-99
Cross monitoring of input signals
with dynamic test if short circuits
90 are not
detectable (for multiple
inputs/outputs)
Cyclic test stimulus by dynamic
90-99 change of input signals
Cross comparison of input signals
with immediate and intermediate
results in the logic (L) and
program execution monitoring in
99
relation to timing and logic, and
detection of static failures and
short-circuits (with multiple
inputs/outputs)
Plausibility check, e.g. usage of
normally open contacts and
99 normally closed contacts =
antivalent signal comparison of
input elements
Comment
An adequately high test
rate must be ensured
Only effective if pulse
allocation active
DC dependent on
frequency of the start /
cyclic test
DC = 90 test only at
intervals > 4 weeks
DC = 99 test at least 1 x
day/ or 100-times
demand rate
With short-circuit fault
exclusion up to DC=99
possible
DC dependent on
frequency of the start /
cyclic test
Only effective if pulse
allocation active
Only effective in
conjunction with
activated time
monitoring function for
input element
Page 41 of 173