Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual de usuario descargar pdf (Pagina 37)

SCANNER

COMM FAULT

Chapter 4

Operation and Troubleshooting

4–7

When the scanner’s LEDs change state, use the following table to isolate the

cause.

LED

Condition

Problem Solution

FAULT LED

flashing red

Configured for an invalid

number of I/O blocks.

Modify DIO initialization rung in SLC

program to reflect the correct number

of I/O blocks.

FAULT LED

solid red

Duplicate scanner detected,

or hardware error on scanner.

Disconnect DIO Link from scanner and

cycle scanner power. If the FAULT

LED is off, look for another scanner on

the network. If the condition persists,

replace the scanner.

COMM LED

off

Configuration Data Valid bit

not set in output image

control word (O:e.0).

Add a rung to the SLC program that

sets the Configuration Data Valid bit

after communications is established.

COMM LED

flashing green

An I/O block is not properly

configured, connected,

powered, or is faulted.

Find the I/O block with the COMM LED

off. Check the DIO Link connections,

power, and switch settings.

COMM LED

flashing red

Scanner is incorrectly

connected, or all I/O blocks

are incorrectly configured,

have no power, or are faulted.

Check DIO Link wiring at scanner.

Check I/O block configuration and

power status.

COMM LED

solid red

Duplicate scanner detected,

or hardware error on scanner.

Disconnect DIO Link from scanner and

cycle scanner power. If the FAULT

LED is off, look for another scanner on

the network. If the condition persists,

replace the scanner.

Troubleshooting

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Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual de usuario Pagina 37

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