Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 16)

Publication 1797-6.5.1 - May 2005
1-6 About the FLEX Ex Analog Modules
Programming the Remote Fault Alarm
For the Remote Fault alarm, you must program the threshold in 0.1mA 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% (20.1mA) to 111.88% (21.9mA) on the high end of input
signal range
or
• -0.63% (3.9mA) to -11.88% (2.1mA) 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% (22mA) or higher on the high end of input signal range - This
value indicates a short in the loop.
or
• -12.50% (2mA) 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.
Chapter Summary In this chapter, you learned what FLEX Ex analog I/O modules do. Move on
to Chapter 2 to learn about configurable features on your module.
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.