78 Rockwell Automation Publication 5000-UM005B-EN-P - November 2015
Chapter 5 Current/Voltage Analog Output Module Features (5069-OF4, 5069-OF8)
You can disable or latch clamping alarms on a per channel basis. The alarms are
disabled by default.
To see where to set the high clamp and low clamp parameters, see the following:
• 5069-OF4 module -
page 102
• 5069-OF8 module, see
page 106
Clamp Alarming
Clamp Alarming works directly with Output Clamping. When a module receives
a data value from the controller that exceeds clamping limits, it applies signal
values to the clamping limit. In addition, a limit alarm is triggered.
The following tags indicate that a clamping alarm was triggered. That is, the tag is
set to 1.
• I.Chxx.LLimitAlarm
• I.Chxx.HLimitAlarm
For more information on using module tags, see Appendix B,
Module Tag
Definitions on page 133.
IMPORTANT
Clamp values are in engineering units and are not automatically
updated when the scaling high and low engineering units are changed.
Failure to update the clamp values can generate a very small output signal
that could be misinterpreted as a hardware problem.
For example, a 5069 Compact I/O analog output module channel that uses
a Current (mA) output type with Clamping enabled has the following
configuration parameters:
• Scaling values:
– High Engineering = 100.0000%
– Low Engineering = 0.0000%
• Clamp Limits:
– High Clamp = 100.0000%
– Low Clamp = 0.0000%
If you change the Scaling High Engineering value to 90.0000%, the High
Clamp value remains at 100.0000.
You must change the High Clamp value to 90.0000 to make sure that the
application continues to operate as expected.
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