Installation manual
Page 20 of27
5.1.4 Two-channel relay output
– external control circuit with monitoring
For safety applications from PI d and higher acc. to EN ISO 13849-1. The external circuit is
controlled in dual-channel mode via two relay outputs. Each of the two external cutout paths
is monitored. For PL e acc. to EN ISO 13849-1 a sufficiently high testing rate (see the
remarks) and MTTF
D
= high is required for the external circuit.
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
P
N
Shut-down circuit 1
Shut-down circuit 2
Safety note:
To achieve PI d and 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.
