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Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 8
Use I/O Modules with CompactLogix 5370 L2 Controllers
To disable open circuit detection, choose Disable. To enable open circuit
detection, choose any of the other four options.
describes the module response that is associated with each enable
selection.
When you enable open circuit detection for an input channel, an extra update
time is used to calculate the overall channel type. The
increase
in channel update
time is
11 ms
for each channel that enables open circuit detection response.
lists example module update times that are based on channel
configurations.
Table 14 - 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.
Table 15 - Example Module Update Times
Example Enabled Analog Input
Channel Configuration
Channel Update Time Calculations
Module
Update
Time
•
Channel 0:
–
Input type = Current
–
Filter Frequency Selection = 60 Hz
57 ms
57 ms
