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1MRS750527-MUM

Feeder Terminal

Technical Reference Manual, General

REF 54_

The output behavior when the value attribute is outside the defined limits is as

follows:

Note that the output is also forced to 0 mA on the 4...20 mA range when the value

is below the low limit. This behavior can be used to indicate a fault to the receiver.

5.1.10.3. Analog output configuration example

The analog outputs are supported in the Relay Configuration Tool by the

MEAO1...MEAO4 analog output function blocks. As an example, to display the

measured value of neutral current on an analog gauge, the neutral current

measurement block MECU1A is connected to MEAO1, which in turn is connected

to the RTD1_6_AO1 global variable. The output invalid signal RTD1_6_AO1IV is

connected to the MMIALAR1 function block to achieve a visual indication of a

fault. The MEAO# function blocks contain the parameters necessary for scaling the

measured value to fit the selected output range. The MEAO# function blocks also

limit the output change frequency to achieve a tolerable system load.

meaox1

Fig. 5.1.10.3.-1 Analog output configuration example

Output range Value of AO# Output current Invalidity attribute AO#IV

0...20 mA >20 20 mA TRUE

0...20 0...20 mA FALSE

<0 0 mA TRUE

4...20 mA >20 20 mA TRUE

4...20 4...20 mA FALSE

<4 0 mA TRUE

ABB REF 54 Series Technical Reference Manual, General

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