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PLC sequence controller
Sequence ΓÇô an ordered series of symbols, characters, names, events, etc., constituting the structure of the system. The occurrence of subsequent elements results from a specific rule or formula. For example, the sequence determines the order in which the cable wires will be connected to the modular sockets and plugs. Wiring manufacturers use colors to label the sequence.
The term ΓÇÿsequenceΓÇÖ can also be used in association with computers and telecommunications, mainly refers to a constant work in accordance with rules and regulations. On this basis, it can be assumed that ΓÇÿsequence controlΓÇÖ refers to making the device operate in accordance with predetermined rules and conditions.
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Many control applications do not involve analog process variables, that is, the ones which can assume a continuous range of values, but instead variables that are set valued, that is they only assume values belonging to a finite set. The simplest examples of such variables are binary variables, that can have either of two possible values, (such as 1 or 0, on or off, open or closed etc.). These control systems operate by turning on and off switches, motors, valves, and other devices in response to operating conditions and as a function of time. Such systems are referred to as sequence/logic control systems. For example, in the operation of transfer lines and automated assembly machines, sequence control is used to coordinate the various actions of the production system (e.g., transfer of parts, changing of the tool, feeding of the metal cutting tool, etc.).
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Basic sequence control is the combination of the following elements:
- Sequential control
- Conditions control
- Time limit control / counting control
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