by Armando Chacon | Dec 21, 2020 | Control Engineering
The input/output (I/O) section of a PLC is the section to which all field devices are connected and provides the interface between them and the CPU. Input/output arrangements are built into a fixed PLC while modular types use external I/O modules that plug into the...
by Armando Chacon | Dec 14, 2020 | Control Engineering
The criteria used in categorizing PLCs include functionality, number of inputs and outputs, cost, physical size, and in some cases the brand requirements from the client. You can look as example the omron table for selecting a PLC. Of these, the I/O count is the most...
by Armando Chacon | Dec 12, 2020 | Control Engineering
Consider the simple process control problem illustrated. Here a mixer motor is to be used to automatically stir the liquid in a vat when the temperature and pressure reach preset values. In addition, direct manual operation of the motor is provided by means of a...
by Armando Chacon | Dec 7, 2020 | Control Engineering
A typical PLC can be divided into parts, these are the central processing unit (CPU), the input/output (I/O) section, the power supply, and the programming device. Input/output (I/O) section The I/O system forms the interface by which field devices are connected to...
by Armando Chacon | Dec 7, 2020 | Control Engineering
The programmable controller has eliminated much of the hardwiring associated with conventional relay control circuits. Other benefits include easy programming and installation, high control speed, network compatibility, troubleshooting and testing convenience, and...
