User manual

Publication 1797-6.5.1 - April 1999

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