
Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx
Page 84 of 260
Version: 25F
4.2.1.4.3 Dual-channel sensor without timeout with cross-shorting test
Faults are at least detected when requested. The DC is medium and by using cyclic tests
(start test, operational/organizational tests) can be changed up to high level. depending on the
test frequency.
Only normally closed contacts should be used for safety related applications.
PI d acc. to EN ISO 13849-1 can be achieved when using sensors / switching elements with
fault exclusion for not opening the switch contacts. This is permissible when using positively
disconnecting switches with correct constrained actuation. The use of sensors with self-
monitoring output contacts is also permitted.
Pl e in accordance with EN ISO 13849-1 can be achieved when using sensors / input
elements with sufficiently high MTTFd in connection with temporal plausibility monitoring and a
sufficiently high change of the switching state = dynamic testing.
I01
I02
I03
I04
I13
I14
T1
T2
X14
.
.
.
L+
L-
X12
Figure: dual-channel sensor homogeneous without cycling, with positive disconnection
I01
I02
I03
I04
I13
I14
T1
T2
X14
.
.
.
L+
L-
X12
S
1
A
1
Figure: dual-channel input element heterogeneous, without cycling