Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 14)

Publication 1797-6.5.1 - May 2005
1-4 About the FLEX Ex Analog Modules
Data Format Alarm Example
In this example, the normal active data range is 4-20mA. 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% (20mA), 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 in a fashion converse to the overrange. This
feature notifies you when the input signal falls underrange. If the input signal
falls below 0% (4mA), 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
0mA 4mA 20mA 22mA
remote fault remote fault
local
fault local
fault
underrange overrange
programmable
in 20 0.1mA
steps by Error
Level 0.1mA
Steps
parameter
-12.50% 0.00% -25.00%
Remote Transmitter Error
Up/Down parameter
determines which of these
is active
programmable
in 20 0.1mA
steps by Error
Level 0.1mA
Steps
parameter
100.00% 112.50%
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