How to Manage Energy Usage with Ethernet I/O – Metering Project – 8400805
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, together 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.
- The university requires consistent installations that can be duplicated across the campus.
- Communication with the data historian software, InStep eDNA, via Modbus TCP/IP over the campus Ethernet network.
Implementing the Solution:
- Connect a PC to the 989EN-4016, open an internet browser, then assign the network parameters, followed by configuring the discrete inputs as counters to totalize the flowmeter pulse outputs.
- Simulate input pulses and observe the count increase in the 989EN-4016 counter test page.
- 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.
- BusWorks Discrete I/O 989EN-4016
Notes: 989EN-4016 modules have 16 discrete I/O where each channel can be an input or an output. Optionally, this model allows the first 8 channels to be used as non-volatile pulse counters; with the remaining 8 channels available as local output alarms for their associated input counters.
The 989EN-4016 module is an affordable, versatile discrete and counter/alarm remote I/O. With fast installations and Class 1 Div 2 ratings, duplication across the campus was easily achieved. Additionally, the campus data historian software was quickly programmed to communicate with the 989EN solution.
Learn more: What is Ethernet/IP?