by C. Stanley

This is the second article in a series that shows how to create user defined function blocks using Modicon Concept v2.6 programing software. This article will show how to create an integrator function block.

Many basic control system component blocks contain an integrator function. Some examples are PID, Lead-Lag and filter blocks. An integrator function has an output that is the time integral of the input signal.

by C. Stanley

This article will show how to create user defined function blocks. The first block, a summing junction, was chosen to be simple in nature to illustrate the steps in creation without unnecessary complication.  Future articles will not be as in depth with creation mechanics and spend more effort on the functionality. The culmination of these series of articles will be a functional turbine speed control. The programming package for this series is Modicon Concept v2.6s. 

Courtesy of: Delta Automation, Inc.

The default setting for the remote I/O hold up time (HUT) on a Modicon PLC system, is 300 milliseconds. This determines the amount of time that the discrete outputs associated with a particular drop will remain in the "on" state once communication with the processor is lost. This loss can be due to a power loss at the drop or a cabling problem for example. With the default setting of 300, the discreet outputs will de-energize after 300 milliseconds (0.3 seconds).

Courtesy of: Delta Automation, Inc.

It is important to keep in mind when deciding the routing paths for your data transmissions which utilize more than one Modicon Bridge Plus device, the amount of traffic which may attempt to flow through it.

Courtesy of: Delta Automation, Inc.

History | Specifications | Modbus Organization">Modbus Plus is a robust network of peer to peer communications used on process control and data acquisition applications, but several basic mistakes are commonly uncovered during the certification process performed by Delta Automation, Inc.'s Field Service Engineers.

This text from Schneider's website was originally on at http://www.schneiderelectric.com.tr/html/en/company/corporate/history/modicon.htm but has since been removed.  We saved it from Google's cache for our reference and your reading pleasure. 

Modicon history

Modicon created the first programmable logic controller (PLC) in the United States in 1968. The device’s success gave rise to a global industry that has expanded considerably over the past 30 years. PLCs put intelligence in machines and automated processes used in industry, infrastructure and buildings.