Fault Diagnostics - Pilz PSS Series Operating Manual

Fault Diagnostics

If you detect faults on SafetyBUS p, the following tables may help you to
find the source of the fault and to rectify it.
Connection test
Problem
Resistance between
CAN_H and CAN_L
< 50 Ω
Resistance between
CAN_H and CAN_L
> 85 Ω
Short circuit detected
Length measurement
Problem
Error message
"Measurement not OK" is
displayed
Operating Manual: PSS SB TESTER
Cause
A terminating resistor has an
invalid value or there are too
many terminating resistors
present
A terminating resistor is
missing or has an invalid value
Short circuit
Cause
Length of bus line < 25 m
Correcting the problem
Check the terminating
resistors, both terminating
resistors must have a value of
120 Ω
Check the terminating
resistors, both terminating
resistors must have a value of
120 Ω
Check the wiring
Correcting the problem
Cable runs < 25 m cannot be
measured
7-1