Jim 'Slim' Mimlitz

Jim ‘Slim’ Mimlitz, SCADAmetrics

[2022 Edit: The technology in this article has been deprecated, due to our introduction of the Model EMP Signalizer and Model APK (and APK.PLUS) Analog Pulse Kit, which supplant the need for the equipment and techniques described in this article.]

In most cases, EtherMeter users will collect flow rate data via the device’s digital Ethernet and Serial communication channels.  Digital communication protocols include MODBUS (TCP/RTU/ASCII), DF1, and EtherNet/IP™.

However, in some instances, the user may wish to interface to 4-20mA analog signals that are proportional to flow.  Replacement of Sensus ACT-PAK instrumentation is just one possible use.  However, in this case, the EtherMeter is capable of deriving the 4-20mA signal from either an encoder-type or a pulse-output-type flow meter.  Within the Setup Menu, the EtherMeter also permits the user to specify the 4-20mA span (the flow-rate that corresponds to 20mA).

When used with an encoder-type flow meter, it is important to recognize the limitations of this type of 4-20mA signal.  Because it is not based upon a hard real-time flow-rate signal, the user should therefore exercise caution when using the 4-20mA signal to drive a PID control loop.

SCADAmetrics Analog Flow-Output Demonstrator Panel

This document describes the wiring procedures and EtherMeter settings that are required for 4-20mA output signaling.  Note that the EtherMeter requires Special Firmware plus an ADAM-4024 module (by Advantech) for this option, and so the purchaser must ensure that the Analog-Output Firmware+Module option is selected when buying at the eStore.  Also, it is important to note that when using this option, the ADAM-4024 module consumes the serial port; and therefore any digital communications to the EtherMeter must occur via the Ethernet port.

Detailed procedures are available in a new Application Note posted in the SCADAmetrics Documentation Center:

LINK TO APP NOTE

Jim 'Slim' Mimlitz

About Jim 'Slim' Mimlitz

Licensed Professional Electrical Engineer @ SCADAmetrics. Specialties: Connecting Flow Meters with SCADA, Telemetry, and Building Automation Systems. Electronic Circuit Design, Software Development.

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