Allen-Bradley MediaChecker 1788-MCHKR Manual page 20

20
The Test Function (TEST)
Display
* Because some measurements are not possible on faulted cables, the MediaChecker might report the + and – wires as open when they
are not actually open.
1788-UM002A-US-P – April 2000
Table 9. DeviceNet Test Failures (without Cable ID) (cont.)
Failure
The MediaChecker measures a
very short length for the CAN_L
wire as compared to the other
wires.
Description
"OPEN" is blinking.* The L wire is open at the near end.
To detect an open at the far end, connect the Cable ID
to the far end and repeat the test or connect the Cable
ID to this end of the cable and repeat the test from the
other end.