Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario descargar pdf (Pagina 72)

Publication 1746-UM001A-US-P

6-2 Module Diagnostics and Troubleshooting

Channel Diagnostics

When a channel is enabled (bit 15=1), a diagnostic check is

performed to see that the channel has been properly configured. In

addition, the channel is tested on every scan for configuration errors,

out-of-range errors, and, for the 4 to 20 mA input type, open-circuit

conditions.

A failure of any channel diagnostic test causes the faulted channel

status LED to blink. All channel faults are indicated in bits

15 through 13 of the channel’s status word. Channel faults are

self-clearing. When the fault conditions are corrected, the channel

status LED stops blinking and resume steady illumination.

Invalid Channel Configuration

Whenever a channel’s configuration word is improperly defined, the

channel status LED blinks and the channel status word indicated the

type of configuration error in bits 15 through 13. See “Error Codes” on

page 6-5.

Configuration errors occur when the data format (bits 8 through 6) in

the channel configuration word are invalid.

Out-Of-Range Detection

Whenever the data received at the channel data word is out of the

defined operating range, an over-range or under-range error is

indicated in the channel status word. See “Error Codes” on page 6-5.

ATTENTION

If you clear (0) a channel enable bit (15), all channel

status information is reset.

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario Pagina 72