Allen-Bradley 1794-IE8H User Manual download pdf (Page 27)

Publication 1794-UM063A-EN-P - March 2006

Configurable FLEX I/O Analog Module Features 2-3

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 I/O

analog I/O application:

Choose the best input filter cutoff in your programming software.

Table 2.2 Input Filter Frequency

Filter 76543210

Frequency 0.5 Hz

(2 s)

1 Hz

(1 s)

2 Hz

(500 ms)

4 Hz

(250 ms)

10 Hz

(100 ms)

Reserved

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Allen-Bradley 1794-IE8H User Manual Page 27