Rockwell Automation 1797-OE8H FLEX Ex HART Analog Modules User Manual - Manual (Page 20)

Publication 1797-6.5.3 - March 2006
1-6 About the FLEX Ex HART Analog Modules
Program the Remote Fault Alarm
For the Remote Fault alarm, you must program the threshold in 0.1 mA steps
at any level on the high or low end of input signal range. The Remote Fault
alarm activates if your I/O module receives input signal values of:
• 100.63% (20.1 mA) to 111.88% (21.9 mA) on the high end of input
signal range
or
• -0.63% (3.9 mA) to -11.88% (2.1 mA) on the low end of input
signal range
Local Fault Alarm
The Local Fault alarm notifies you when the loop to the transmitter or field
device, if no transmitter is used, is open or shorted.
• 112.50% (22 mA) or higher on the high end of input signal range - This
value indicates a short in the loop.
or
• -12.50% (2 mA) or lower on the low end of input signal range
- This value indicates an open wire condition in the loop.
The Remote Fault and Local Fault alarms are issued with the same bit whether
the cause is an under or overrange. Monitor the Overrange and Underrange
bits in your programming software to determine if the problem is a high
current or low current.
IMPORTANT
This alarm is only active for one band, either on the high side of
normal operation or the low side.The Remote Transmitter Error
Up/Down parameter determines which side is active. See page
2-3 for a description of the Remote Transmitter Error Up/Down
feature.
IMPORTANT
Once the alarm is issued, it remains active as long as the input
signal value remains in the programmed range.