Screening Test; Performing The Screening Test - Pilz PSS Series Operating Manual

Tests/Measurements

Screening test

The screening test can be used to check for breaks in the cable screening.
You can therefore determine whether the cable screening is attached
correctly to each bus connector.
The screening test corresponds to a resistance measurement between
CAN_H and CAN_SHLD. The PSS SB TESTER is inserted at one end of
SafetyBUS p, while at the other end a plug is inserted, which produces a
short circuit between CAN_H and CAN_SHLD. If the value measured at
the resistor is greater than the pre-assigned limit value of 200 Ω, an open
circuit is detected.
NOTICE
The connection test must be performed before the screening test. This is
the only way to be sure that there are no short circuits, which would
corrupt the result of the screening test.

Performing the screening test

• Add the PSS SB TESTER and the shorting plug to SafetyBUS p as
shown in Fig. 5-2.
• Switch on the PSS SB TESTER.
• Highlight the
• The "SafetyBUS p" window opens, in which you can select the test/
measurement. Use the arrow keys to move the cursor to the symbol for
"Screening test"
• The following question is displayed: "SafetyBUS p is switched off?".
Make sure that SafetyBUS p is switched off, i.e. all devices on
SafetyBUS p must be switched off and there must be no voltage present
on the "Vcc" line.
Then press VAL.
The PSS SB TESTER then checks whether "Vcc" is without voltage. If this
is the case, the test is performed and the following message appears on
the display: "Screening test in progress".
5-6
symbol in the "Start" window and press VAL.
and press VAL.
Operating Manual: PSS SB TESTER