Project: Baton Rouge Wastewater Pump Station SCADA System (February 21,2006)

02/21/2006


February 21, 2006

Monitoring of bandwidth usage during the past week indicates our current polling scheme is not very data efficient. We need to stay within 2 megabytes per month data usage per site or data transmission charges will soar vs. the allocated budget. Considering the 27 words of data to be transferred, one might be led to believe updates every few minutes would be possible. The reality is that to send and receive a Modbus message, there is considerable overhead. To reduce the impact of the overhead, bits are preferably packed into words, and words are kept sequential within the RTU memory map so that one Modbus function call can read a series of registers in one request. Lacking a bit packing function, we have used a sequence of if/then statements to pack bits into words. The original RTU programs were not written sequentially (and could not be written sequentially due to controller addressing requirements). Moving values around inside the controller to force data into a sequential block will allow the OPC server to read all values in one read.

The primary consultant announced last week that they intended to have a PLC and HMI recommended and selected within the next two weeks. Seeing will be believing—past history indicates this projection is probably overly optimistic.





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Robotic integration and cloud connections; SCADA and cybersecurity; Motor efficiency standards; Open- and closed-loop control; Augmented reality
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This article collection contains several articles on how advancements in vision system designs, computing power, algorithms, optics, and communications are making machine vision more cost effective than ever before.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Control room technology innovation; Practical approaches to corrosion protection; Pipeline regulator revises quality programs
Cloud, mobility, and remote operations; SCADA and contextual mobility; Custom UPS empowering a secure pipeline
Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
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