Note
SIL 3 per EN 61508 or PL e/Cat. 4 per EN ISO 13849-1
The following conditions must be met to achieve SIL 3 per EN 61508 or PL e/Cat. 4 per
EN ISO 13849-1:
• The two-channel sensor is connected to a test output pair on the 3RK3 central unit in
compliance with the wiring rules (Page 136).
• Cross-circuit detection of the applicable safety function is activated in Safety ES.
Note
Single-channel acknowledgement button
Cross-circuit monitoring is always implemented in the case of a single-channel acknowledgment
button. This is why a single-channel acknowledgment button must also be connected via a test
output. Non-oating wiring is not possible.
Connection options without test output (for non-oating sensors)
1 single-channel sensor 1 two-channel sensor
IN1, IN2 sensor inputs
5.3.2.4 Connecting non-safety-related inputs
Non-safety-related sensors
The 8DI expansion module has 8 non-safety-related sensor inputs. All other 3RK3 modules only
have safety-related inputs. Therefore, these inputs are also used for non-fail-safe signals (e.g.
fault acknowledgment).
Non-safety-related signals such as start buttons can be supplied on modules with test outputs
not only in a non-oating implementation via L+ but also via the test outputs T1 / T2, just like
single-channel sensors.
Description of the hardware
5.3 Connecting / wiring
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 139
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