User Manual

Compact IO™ Isolated HART Analog Input Module
U ser 's M a n u a l 0 300 21 5- 03 R ev. A
6-18
Sec t ion 6.7
Determining
Module
Update Time
The module update time is defined as the time required for the module to sample and
convert the input signals o f all enabled input channels and pro vide the resulting data
values to the processor. The module update time is equal to the slowest channel step
response.
6.7.1 Calculating Module Update Time
To determine the module update time, locate the channel with the slowest step response,
this will be the appro ximate module update time.
Example:
Channel 0: +/- 10 Vdc with 60 Hz filter
Channel 1: 4 to 2 0 mA with 28.5 Hz filter
Channel 2: 4 to 20 mA with 300 Hz filter
Channel 3: 4 to 2 0 mA with 28.5 Hz filter
Module Updat e Time
= slowest step response = 28.5Hz or 108 ms