Rockwell-automation 1788 NetLinx Media Checker Users Manual Manual de usuario descargar pdf (Pagina 26)

Testing the Wire Map (WIRE MAP)

1788-UM002A-US-P – April 2000

Table 11. DeviceNet Wire Map Failures (with Cable ID)

Display Failure

Description

Miswire (wires

are swapped)

“H” and “+” are blinking. The first line on the display (LH +- S) shows the

near end connections. The second line (L+ H- S) shows far end

connections. This mapping shows that the H and + wires are swapped.

Short The S and L wires are shorted together.

Open, or a wire

is swapped with

the shield

“o” is blinking in the bottom line. The “+” wire is open at the far end or is

swapped with the shield (S).

Multiple shorts*

“ss”, “L-”, and “o” are blinking. “ss” blinking indicates a short from L to S.

“L-” blinking indicates a fault between the L and – wires. Use TEST or

LENGTH to check the resistance between the wires.

Split pair

If nothing is blinking, the connection is good. If part of the display is

blinking (for example, “+-” in both rows), there is a split pair, or a fault that

the MediaChecker cannot clearly identify because the fault interferes with

testing.

* The MediaChecker alternately displays “??” and “RA” when the Cable ID is detected, but a problem with the cable or with the Cable ID is

interfering with the identification process.

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Rockwell-automation 1788 NetLinx Media Checker Users Manual Manual de usuario Pagina 26