Jim Mimlitz

Jim Mimlitz, SCADAmetrics

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 ACK-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 Mimlitz

About Jim 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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