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Programmable Logic Controllers

Ypsilanti, MI

Installation and programming of computerized controls for HVAC, lighting, production line equipment, and more

Electronic Wires
Expert Assessment and Installation

Our team is highly experienced assessing PLC requirements

State Licensed Electricians

State licensed electricians and registered apprentices

100+ Years in Ypsilanti

The region's top-rated and most experienced electrical team

What is a Programmable Logic Controller? 

A Programmable Logic Controller (PLC) is an industrial computer that has been adapted to control manufacturing or production processes that require high reliability, ease of programming, and process fault diagnostics. PLCs are designed to monitor inputs from sources like pressure sensors, temperature sensors, limit switches, auxiliary contacts, and pilot devices.

PLCs were initially developed to support the automotive industry, and have since made their way into manufacturing plants across industries.

How does a Programmable Logic Controller work? 

PLCs work by continually scanning a program. This scan cycle essentially consists of the following three steps. 

Step 1: Input Status Review

The PLC takes a snapshot of each input to identify whether its current status is On or Off, and writes it into memory. 

Step 2: Program Execution

The PLC executes your customized program or system one step at a time, using the input states that have just been written to memory. 

Step 3: Output Updates

Finally, the PLC updates the status of the outputs based on which inputs were on during the first step and the results of executing your program during the second step.

What type of Programmable Logic Controller do I need? 

PLCs come in all shapes and sizes. When evaluating PLC options, be sure to ask the following questions of your system: 

  • How many inputs and outputs do I need?

  • What environmental elements will my PLC be exposed to?

  • What are the networking requirements? 

  • Are there any especially high speed or voltage requirements for the inputs or outputs?

Electronic Wires

"I can't recommend A.F. Smith Electric enough! Both Darrell and Robert were prompt, professional, knowledgeable, and all-around good guys. I've found my new go-to electricians!"

- Janet S., Ypsilanti Resident


Let's Get Started

Give us a call today and Darrell from our service team will follow up with you.


Darrell Kasem, Service Manager

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