Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 197
Use I/O Modules with CompactLogix 5370 L2 Controllers Chapter 8
Channel Update Times
Some combination of the following times determines the channel update time
for an enabled analog input channel:
• Channel Input Type and Filter Frequency Selection Update Time
-
Required for channel update time calculation
• Cold Junction Compensation Update Times
- Optional for channel
update time calculation time
• Open Circuit Detection Update Time
- Optional for channel update
time calculation time
Channel Input Type and Filter Frequency Selection Update Time
When you enable an embedded analog input channel, you must select an input
type and a filter frequency for that input. The selections that you make
determine the value that is required when calculating channel update time.
Tab le 13
shows the channel update times for each channel input type and filter
frequency selection.
IMPORTANT Each channel input type has multiple ranges or types. For example, a
voltage input type can use one of six voltage ranges, as listed in Table 11 on
page 186. Regardless of which voltage range the channel uses, the channel
update time remains the same. For more information, see Table 13
.
Table 13 - Channel Update Times
Filter Frequency
Selection
(1)
(1) Filter frequency selections are made on the Input Configuration tab of the Module Properties dialog box.
Channel Update Times Based on Input Type Selection
Voltage, Current, or
Thermocouple Input Type
Resistance or RTD Input
Type
10 Hz 307 ms 614 ms
50 Hz 67 ms 134 ms
60 Hz 57 ms 114 ms
250 Hz 19 ms 38 ms
500 Hz 13 ms 26 ms
1 kHz 11 ms 22 ms
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