Rockwell-automation 1791-XXXX Discrete I/O AC and DC Block I/O Input a Manuel d'utilisateur télécharger pdf (Page 72)

Troubleshooting

Chapter 5

5-2

Table 5.A

Troubleshooting

Chart

Indication Probable Cause Corrective Action

Green COMM indicator on

Red STATUS indicator off

I/O status indicator on/off

Normal operation None required

Red STATUS indicator on Block failed selftest, or a major fault is detected.

Cycle power to the block. If problem persists,

replace the block.

Red STATUS indicator flashing

Green COMM indicator off

Communication failure - RIO cable off, 100ms

between valid frames, 20ms idle time exceeded.

Improper processor or scanner switch settings.

Check remote I/O cable connections, verify

scanner or processor switch settings.

Green COMM indicator off No communication with processor, scanner etc.

Check that power is applied to block.

Make sure that proper number of blocks are

configured.

Check remote I/O link for duplicate address.

Green COMM indicator flashing

Reset command (or output disable bit for SLC) has

been issued by processor or scanner.

Check program. Correct as necessary.

Check terminator, resistors and cable wiring.

Green

COMM

indicator

flashing

SLC or programmable controller in program mode. Place in run mode.

COMM and STATUS indicators

alternately flashing

Processor restart lockout is selected and a fault

has occurred. (Communication to block is

established.)

Cycle power to block.

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 97 98

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