Installation manual
Page 63 of204
4.3.3.1.4 Two-channel switching relay output with external monitoring - group feedback
For safety related applications from Pl d acc. to EN ISO 13849-1 two relays on the PSCBR1X
module and two external power contactors are used.
K1
K2
L+
L-
X22
X14
DI1
DI2
DI3
DI4
DI13
DI14
P1
P2
X12
Fig.: Two-channel switching relay output with external monitoring
– group feedback
The two external monitoring contacts are switched in series, supplied by the clock signal P1 and
read in from DI1 (configured as EMU-input). In case of higher demands one must consider that at
least 1 switching process must take place every 24 hours.
Safety note:
For achieving PI e acc. 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. However, a test should at
least be carried out cyclically 1 x year.
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