Watchdog Timer in PLC

What is a Watchdog Timer in PLC?

Watchdog timer helps to reset the CPU errors which occur during scan time so that the PLC starts working again without any manual reset.

Real-time and historical SCADA Trends

What are Trends in SCADA?

In SCADA graphical display of process data is called Trends. There are two types of Trends. Real-time and Historical trends

DDE Protocol

What is the DDE Protocol?

Dynamic Data Exchange (DDE) Protocol is an interprocess communication system that allows data to be communicated or shared between the devices.

LIFO Instruction in Allen Bradley PLC Programming

LIFO Instruction in PLC

LIFO instruction used in the PLC programming applications that require to store the sequence of data in order and unload it.

Types of Allen Bradley PLC

Types of Allen Bradley PLC

In this article, I will discuss the types of Allen Bradley PLC, which are PLC 5, SLC 500, CompactLogix, ControlLogix, and MicroLogix.