Installation manual
Page 19 of27
5.1.3 Dual-channel switching relay output with external monitoring group feedback
For safety-related applications from Pl d onwards according to EN ISO 13849-1, two relays
on the PSCBR-E-133-12DI-2DIO-8RO module and two external power contactors are used.
X17
X14
K1
K2
IO01
IO02
P1
P2
X12
DI01
DI02
DI03
DI04
L +
L -
X17.1
X17.2
X17.3
X17.4
X14.1
X14.2
X14.3
X14.4
X12.1
X12.2
X12.3
X12.4
X7
K1/11
K1/12
K2/11
K2/12
X7.1
X7.2
X7.3
X7.4
Fig.:
Two-channel switching relay output with external monitoring
– group feedback
The two external monitoring contacts are switched in series, supplied by clock signal P1 and
read-in from DI01 (configured as an EMU input). In the case of higher requirements, you
must consider that at least one switching process must take place every 24 hours.
Safety note:
To achieve PI d or above according to EN ISO 13849-1, a sufficiently high testing rate
is required.
For applications with frequent safety shut-down requests, these tests should be
performed more frequently, e.g. at the beginning of the shift, 1 x per week. For Pl d,
you must carry out a cyclical test at least once a year; to achieve Pl e this test is
needed at least once per month.
