SICK ReLy HAND1 - Enabling Current Paths; Application Diagnostic Output; External Device Monitoring (EDM)

Further topics
•
"D
ata sheet", page 25
4.4.2 Enabling current paths
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
b
Ensure the enabling current paths are supplied by the same voltage supply.
Cross-circuits
Cr
oss-circuits between the enabling current paths or with other signals may not be
detected and can put the machine in a dangerous state.
Measures:
b
Lay the cables in a protected manner or separately (e.g., within the control cabinet
as per IEC60204-1).
b
Take other necessary measures to achieve the required safety-related characteris‐
tic values.
4.4.3 Application diagnostic output
Application diagnostic output Y1
T
he signal of the Y1 application diagnostic output changes as soon as the enabling
current paths switch. The application diagnostic output is not safe.
Application diagnostic output Y1 is based on the push-pull principle from hardware
version 2.00.0, meaning it can both absorb and apply current.
Table 4: Switching behavior of application diagnostic output Y1
State of enabling current paths State of application diagnostic output Y1
Closed LOW (NPN)
Open HIGH (PNP)
4.4.4 External device monitoring (EDM)
External device monitoring (EDM)
W
ith static external device monitoring, the safety relay tests whether the controlled
actuators (contactors) have dropped out just before energizing the internal relay.
Use with external device monitoring (EDM): Connect N/C contacts of the controlled
actuators between voltage supply U
V
and S1.
Use without external device monitoring (EDM): Connect U
V
and S1 with a wire jumper.
Cross-circuits
Cr
oss-circuits within the external device monitoring (EDM) itself (e.g., before and after
the contactor being monitored) or with other signals may not be detected and can put
the machine in a dangerous state.
Measures:
b
Lay the cables in a protected manner or separately (e.g., within the control cabinet
as per IEC60204-1).
b
Take other necessary measures to achieve the required safety-related characteris‐
tic values.
4 P
ROJECT PLANNING
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O P E R A T I N G I N S T R U C T I O N S | ReLy HAND1 8020872/1FH0/2022-10-27 | SICK
Subject to change without notice