Allen-Bradley MediaChecker 1788-MCHKR, Руководство пользователя

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16
The Test Function (TEST)
1788-UM002A-US-P – April 2000
Table 8. DeviceNet Test Results (with Cable ID)
1
Display Failure Description
Short across the data pair
2
“SHORT” is blinking. L and H are shorted together at
approximately 600' (183 m).
Split pair “SPLIT PR” is blinking. In this case, a power wire and a
data wire are swapped at the near end and swapped
back at the far end.
Open, or a wire is swapped with
the shield “OPEN” is blinking. This can mean one of the following:
•
The + wire is open somewhere along the cable.
•
The + and S wires are swapped somewhere along
the cable.
1. The MediaChecker might not be able to map some situations with four or five wires miswired. In all cases, the MediaChecker indicates
a fault and gives a partial description of the problem, but might not identify all of the wiring errors.
2. The distance to a short may not be reported, depending on the characteristics of the short. See “Calculating the Distance to a Short” on
page 32 for more information.