Rockwell Automation 1794-OE8H FLEX I/O HART Analog Modules User Manual - Manual (Page 20)

Publication 1794-UM063A-EN-P - March 2006
1-4 About the FLEX I/O HART Analog Modules
Data Format Alarm Example
In this example, the normal active data range is 4-20 mA. The alarms are
generated in three overlapping bands.
Overrange Alarm
The overrange alarm notifies you when module input is overrange. When the
input signal exceeds 100% (20 mA), an Overrange Alarm is generated.
This alarm stays active at any value above 100% of range and is always enabled
by the module.
Underrange Alarm
The underrange alarm works converse to the overrange. This feature notifies
you when the input signal falls underrange. If the input signal falls below 0% (4
mA), an Underrange Alarm is generated.
This alarm stays active at any value below 0% of range and is always enabled by
the module.
PHYSICAL INPUT SIGNAL RANGE
0 mA 4 mA 20 mA 22 mA
Remote Fault Remote Fault
Local
Fault Local
Fault
Underrange Overrange
Programmable
in 20 0.1 mA
steps by Error
Level 0.1 mA
Steps
parameter
-12.50% 0.00% -25.00%
Remote Transmitter Error
Up/Down parameter
determines which of these
is active
Programmable
in 20 0.1 mA
steps by Error
Level 0.1 mA
Steps
parameter
100.00% 112.50%
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