Rockwell Automation 1762-IT4 Thermocouple/mV Input Module - Manual (Page 63)

Publication 1762-UM002A-EN-P - July 2002
Module Data, Status, and Channel Configuration 3-33
Determining Module
Update Time The module update time is defined as the time required for the
module to sample and convert the input signals of all enabled input
channels and provide the resulting data values to the processor.
Module update time can be calculated by adding the sum of all
enabled channel’s times. The module sequentially samples the
enabled channels in a continuous loop as shown below.
Table 3.4 Effective Resolution vs. Input Filter Selection for Millivolt Inputs
Filter Frequency ±50mV ±100mV
10 Hz 6
µ
V 6
µ
V
50 Hz 9
µ
V 12
µ
V
60 Hz 9
µ
V 12
µ
V
250 Hz 125
µ
V 150
µ
V
500 Hz 250
µ
V 300
µ
V
1 kHz 1000
µ
V 1300
µ
V
TIP
The resolutions provided by the filters apply to the
raw/proportional data format only.
No Thermocouple Calibration Not Active
Sample
Channel 0
Sample
Channel 1
Sample
Channel 2
Sample
Channel 3
Enabled Enabled Enabled
Enabled TC Enabled
Sample
CJC Calibration
Active
Perform
Calibration
Channel 3 Disabled
Channel 0 Disabled Channel 1 Disabled Channel 2 Disabled