Pilz PSS SB TESTER D - Manual (Page 37)

Operating Manual: PSS SB TESTER 5-19
Separate tests: Testing the electrical signal level
Abbreviations for these separate tests in the “Device xx” window:
• Rec. Level CAN_H
• Dom. Level CAN_H
• Rec. Level CAN_L
• Dom. Level CAN_L
Each device on SafetyBUS p is tested to ensure the signals it is sending
have the correct level. The recessive and dominant level of CAN_H and
CAN_L are tested.
In the detailed display of the result from these separate tests, four pieces
of information are displayed: the lower limit, the upper limit, the measured
value and the result.
The limit values for the recessive and dominant level are pre-assigned:
If the value measured for the level lies between the upper and lower limit,
the level is assessed as “OK”.
If the level is incorrect, an error message is issued.
Level
Recessive level
CAN_H
Dominant level
CAN_H
Recessive level
CAN_L
Dominant level
CAN_L
Lower limit
in VDC
2.0
2.8
2.0
0.5
Upper limit
in VDC
3.0
4.5
3.0
2.3