What can a programmable logic controller be used for?
A programmable logic controller ( PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
What are the features of an IDEC logic controller?
Our controllers meet the highest standards for safety, flexibility and value. Whether it is system flexibility, space saving, ease of maintenance or powerful programming features, IDEC’s programmable logic controllers along with exceptional product support will exceed your expectations.
Which is an example of a ladder logic controller?
Example of Simple Ladder Logic, Containing an “or” Condition. When an output is finally reached it becomes “true,” and the PLC activates the output. This allows the PLC to automate a function (e.g., turning a pump on or off) based on set point parameters (e.g., high and low water levels within a tank). 2
Are there any newer formats of ladder logic?
Newer formats, such as state logic and Function Block (which is similar to the way logic is depicted when using digital integrated logic circuits) exist, but they are still not as popular as ladder logic.
What are the different types of PLC controllers?
There are two types of mechanical design for PLC systems. A single box, or a brick is a small programmable controller that fits all units and interfaces into one compact casing, although, typically, additional expansion modules for inputs and outputs are available.
How is a PLC used in a DCS?
The manufacturers of PLCs provide robust, cost-effective discrete I/O modules that can scan discrete data points (sensors) very rapidly. Scan rates much faster than 100 msec are common. The process control modules of a DCS often implement discrete logic, but their discrete I/O capabilities and slow scan rates rarely match that of a PLC.
What kind of logic does a PLC use?
PLCs often use “ladder logic,” a simplistic programming language that is well suited for industrial applications. Ladder logic is based on relay-based logic and can be thought of as a set of connections between inputs (contacts) and outputs (coils). Ladder logic follows a relay function diagram, as shown in Figure 5.2.