Remote transmitter error up or down, High low error level, Input filter cutoff – Rockwell Automation 1797-OE8H FLEX Ex HART Analog Modules User Manual User Manual
Page 33
Publication 1797-6.5.3 - March 2006
Understand Configurable FLEX Ex Analog Module Features 2-3
Remote Transmitter Error Up or Down
A second feature of your input modules that affects use of the Remote Fault
alarm is the Remote Transmitter Error Up or Down feature. Used in
conjunction with the High Low Error level, this feature designates whether
remote faults are displayed with input signal readings beyond the high or low
signal levels normally used by the module.
When setting the Remote Transmitter Error Up or Down feature in your
programming software, set this feature’s bit to 0 to select up. Set the bit to 1 to
select down.
For more information on the Remote Fault Alarm, see page 1-5. For more
information on the Local Fault Alarm, see page 1-6.
High Low Error Level
High Low Error level sets the high and low signal levels at which your input
modules will indicate a signal fault. This feature works in conjunction with the
Remote Transmitter Error Up or Down.
If the Remote Fault Alarm feature is enabled and a remote fault occurs, the
module will detect and report the fault, depending on how the High Low
Error level is configured.
Use your programming software to set the high or low error levels.
Input Filter Cutoff
Eight available input filter settings allow you to choose the best rolloff
frequency for input channels on your I/O module. When choosing a filter,
remember that time filter selection affects your input signal’s accuracy.
For example, if you choose the highest frequency of 10 Hz (filter 3), signal
noise is more likely to affect the reading, but the slowest frequency of 0.5 Hz
(filter 7) provides the most accurate signal due to incoming noise filtering.
See Table 2.2 to decide which input filter to use in your FLEX Ex
analog I/O application:
Choose the best input filter cutoff in your programming software.
Table 2.2 Input Filter Frequency
Filter
7
6
5
4
3
2
1
0
Frequency
0.5 Hz
(2 s)
1 Hz
(1 s)
2 Hz
(500 ms)
4 Hz
(250 ms)
10 Hz
(100 ms)
Reserved