Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario descargar pdf (Pagina 73)

Publication 1746-UM001A-US-P

Module Diagnostics and Troubleshooting 6-3

Open-Circuit Detection

An open-circuit test is performed on all enabled channels configured

for 4 to 20 mA input and all enabled channels with voltage

configurations. Whenever an open-circuit condition occurs, the

channel status LED blinks and the condition is reported in bits 15

through 13 of the channel status word. See “Error Codes” on page 6-5.

Possible causes of an open-circuit include:

•

The sensing device may be broken.

•

A wire may be loose or cut.

•

The sensing device may not have been installed on the

configured channel.

If an open circuit is detected, the channel data word reflects input

data as 0 mA in the 4 to 20 mA configuration. For the voltage module,

open-circuit data is displayed for all voltage ranges as the maximum

value readable in that voltage range. See tables on pages 5-9 and 5-10.

LED Indicators

The module has five LEDs. Four of these are channel status LEDs

numbered to correspond to each of the four groups of four input

channels (0 to 3, 4 to 7, 8 to 11, 12 to 15). The fifth is a module status

LED.

INPUT

Channel Status LEDs

Module Status LED

0-3

4-7

8-11 12-15

Analog Voltage

Module Status

Channel Status

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 119 120

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario Pagina 73