7.3 Diagnostics with LEDs
Requirements
When performing diagnosis of the MSS 3RK3 via LEDs, you must observe all the LEDs on every
module. The interpretation of the errors depends on how the function element is wired to the
inputs.
To be able to diagnose an error, it must be known which function element is wired to the
ashing IN inputs.
LED response
The following table shows the possible cause of error for a particular LED response on the
function elements:
LED response Sensor connected to responding IN
inputs
Meaning/Causes
SF-LED on cen‐
tral unit
Input LEDs on central
unit or expansion mod‐
ule
red The IN LEDs of a sensor
are ashing green.
• Monitoring Universal
• EMERGENCY STOP
• ESPE
• Protective door
• Safety shutdown mat with NC prin‐
ciple
• Two-hand operation
• Enabling button
• Cross-circuit at input x
• Protective door with lock • Cross-circuit at input x
• Protective door opened when inter‐
lock was active
• Safety shutdown mat with cross-cir‐
cuit principle
• Wire break at input x
• Short circuit to P at input x
• Mode selector switch • Invalid operating mode selection
• Muting functions
Note:
To allow diagnosis by LED, only func‐
tion elements with one input and one
output can be interconnected between
the input cell and the function input.
• Muting indicator light defective
• Output functions
Note:
To allow diagnosis by LED, only func‐
tion elements with one input and one
output can be interconnected between
the input cell and the function input.
• Feedback circuit signal and switch‐
ing status do not match
In case of inconsistencies, the output
function immediately switches o all
its outputs.
Diagnostics / service
7.3 Diagnostics with LEDs
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 253
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