Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (Page 52)

Publication 1769-UM014B-EN-P - May 2010

3-14 Module Data, Status, and Channel Configuration for the Input Module

Figure 3.2 Alarm Deadbands

The value entered for a channel’s alarm deadband value must be within the

normal operating data range as set by the Input Data Format selected for that

channel. If an alarm deadband value is entered that is outside the normal

operating data range set for a channel, the module indicates a configuration

error.

The module also checks for an alarm deadband value that is less than 0 or large

enough to exceed one or both of the channel’s full range limits. When one of

these conditions occurs, the module changes the alarm deadband value that is

in violation to one that is allowed. A deadband value less than 0 is set at 0. A

deadband value that when added to the process alarm low data value or

subtracted from the process alarm high data value results in a value that

exceeds the full range limits of the channel is adjusted to the first, smaller value

that eliminates this full range violation.

43153

Low

High

Alarm Deadbands

Normal Input Range

High alarm turns OFF.

Low alarms turns OFF.

Low alarms turns ON.

High alarm

turns ON.

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 52