User Documentation

Operation

5662300000/01/08.10

5.1 Status & alarm LEDs

Status LED

Under normal conditions this (green) LED is on con-

tinuously.

Figure 3 LEDs

A Status LED

B ALARM 2

C ALARM 1

The following table shows how alarm conditions are

displayed.

Status indicator Alarm conditions

Normal status continuously on

Input open circuit flashes at 0.5 Hz

Input short circuit flashes at 5 Hz

Cold Junction error 2 pulses, rests, 2 pulses

Flash memory error 3 pulses, rests, 3 pulses

Table 1 Status indicators

Analogue Output status with alarm

• User may select output value under fault condi-

tions

• Output compliant with NAMUR recommendations

(NE43) can be set (< 3.6 mA or > 21 mA)

Input fault detection

Input faults such as short circuit or open circuit can

be detected for most input types. These are shown

in the table below.

Input type Detection

Open circuit Short circuit

Thermocouple Yes Yes

RTD Yes Yes

Millivolts Yes No

Volts (Positive) Yes No

Milliamps

(Passive)

Yes* No

Milliamps (Active) Yes Yes

Resistance Yes Yes

Potentiometer Yes Yes**

Table 2 Input fault detection

* Open circuit not detected for live zero ranges

** Short circuit for end-to-end