User manual

Publication 1797-6.5.1 - April 1999

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

• -0.63% (3.9mA) to -11.88% (2.1mA) on the low end of input

signal range

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 2-2 for a description of the Remote Transmitter Error

Up/Down feature.

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.

Important:Once the alarm is issued, it remains active as long as the input

signal value remains in the programmed range.

• 112.50% (22mA) or higher on the high end of input signal range - This

value indicates a short in the loop.

• -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.