200 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
Open Circuit Detection Update Time
Open circuit detection is used to verify that the field wiring is physically
connected to the embedded analog input point. If this feature is enabled and
field wiring is disconnected from the input, the application alerts you to the
condition and an open wire bit is set for the respective input channel in the tags
for the project.
Open circuit detection can be enabled or disabled on any channel input type
except for an input channel that is configured to use the 0…20 mA input range.
The configuration selection is made on the Input Configuration tab on the
Module Properties dialog box, as shown in the following graphic. The
configuration choice, that is, enabled or disabled, is the result of an Open
Circuit Response selection for the channel.
To disable open circuit detection, choose Disable. To enable open circuit
detection, choose any of the other four options.
Tab le 15
describes the module response that is associated with each enable
selection.
Table 15 - Open Circuit Detection Response Definitions
Response Option Definition
Upscale Sets the input data value to full upper-scale value of channel data word. The selected
input type and data format determines the full-scale value.
Downscale Sets the input data value to full lower-scale value of channel data word. The selected input
type and data format determines the low scale value.
Last State Sets the input data value to the last input value before the detection of the open-circuit.
Zero Sets the input data value to 0 to force the channel data word to 0.
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