by Armando Chacon | Jan 17, 2021 | Control Engineering
Electromagnetic Control Relays An electrical relay is a magnetic switch. It uses electromagnetism to switch contacts. A relay will usually have only one coil but may have any number of different contacts. Reference Video-Electromagnetic Control Relays With no current...
by Armando Chacon | Jan 3, 2021 | Control Engineering
Memory is the element that stores information, programs, and data in a PLC. The user memory of a PLC includes space for the user program as well as addressable memory locations for storage of data. Data are stored in memory locations by a process called writing. Data...
by Armando Chacon | Dec 31, 2020 | Control Engineering
Many different types of I/O modules have been developed to meet special needs. HIGH-SPEED COUNTER MODULE The high-speed counter module is used to provide an interface for applications requiring counter speeds that surpass the capability of the PLC ladder program....
by Armando Chacon | Dec 27, 2020 | Control Engineering
Discrete devices are inputs and outputs that have only two states: on and off. In comparison, analog devices represent physical quantities that can have an infinite number of values. Typical analog inputs and outputs vary from 0 to 20 milliamps, 4 to 20 milliamps, or...
by Armando Chacon | Dec 25, 2020 | Control Engineering
The most common type of I/O interface module is the discrete type. This type of interface connects field input devices of the ON/OFF nature such as selector switches, pushbuttons, and limit switches. Likewise, output control is limited to devices such as lights,...
