Metering Project - Managing Energy Usage with Ethernet I/O

Defining the Problem:

The university power plant produces both electricity and steam for the campus. The chilled water and steam condensate need to be monitored and recorded by totalizing the pulsed outputs from magnetic, positive displacement, and vortex flowmeters.

The volumetric flow rate, along with the liquid heat loss from the steam-to-heat transfer process, is used in steam cost calculations to better manage the energy demand across the campus.

System Requirements:

• The university requires consistent installations that can be duplicated across the campus.
• Communication with the data historian software, eDNA, via modbus TCP/IP over the campus Ethernet network.

Implementing the Solution:

1. Connect a PC to the 989EN-4016, open an internet browser, assign the network parameters and configure the discrete inputs as counters to totalize the flowmeter pulse outputs.
2. Simulate input pulses and observe the count increase in the 989EN-4016 counter test page.
3. The eDNA software periodically reads the current count value of each input from the 30,000 modbus input registers or the 43,000 holding registers. Two registers of 16-bit unsigned integer values yield a 32 bit totalized count value.

This application note was provided by our supplier Acromag.

For further information about the Acromag products used in this application, please do not hesitate to contact us.

Metromatics   I    07 3868 4255   I   sales@metromatics.com.au