200 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
By default, CJC is disabled. You must clear the Disable Cold Junction
Compensation checkbox to use CJC for a given channel.
You are not required to enable CJC for a channel by using the thermocouple
input type. If you enable CJC and select Update Cold Junction Compensation
every other scan, an extra update time exists on the channel. This extra update
time increases the overall channel update time.
The filter frequency selection for the channel determines the CJC update time.
Tab le 13
shows the CJC update times that are based on filter
frequency selections.
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.
CJC Update Time
10 Hz 614 ms
50 Hz 134 ms
60 Hz 114 ms
250 Hz 38 ms
500 Hz 26 ms
1 kHz 22 ms
To Next Page
Loading...
Need help?
General
