PLC’s were used to replace. This was original way that factories to be wired.
This is the standard language that PLC’s are programed. Based on electromagnetic relay control.
The program that controls the processing of data in a system.
The set general-purpose instructions available with a given controller. In general, different machines have different types.
A type of PLC that has different plug-in options. That could include CPU, digital inputs, analog inputs and other types.
The part of the PLC that controls the activity. Could also be considered the brain.
A type of nonvolatile memory. This type of memory is used for the default program in a PLC.
Refers to there being one of 2 states “on or off”.
A type of module that can read input signals that swing between negative and positive.
This type of memory can retain stored information when power is removed accidentally or intentionally.
This type of memory has some security, due to not being easy to change. One type uses ultraviolent light to erase it.
Down
Are output devices that convert electrical signals, then changing the physical conditions of equipment.
A type of module that only reads input signals in the positive direction.
The smallest distinguishable increment into which a quantity is divided.
Are used to distinguish actual external devices that exist and must be physically wired.
This type of memory will lose stored information when power is removed accidentally or intentionally.
A memory that has the flexibility as RAM. It is non-volatile but can be electrically overwritten.
A command that causes a PLC to perform one specific operation. The user enters a combination of instructions into the PLC’s memory to form a unique application program.
Also called closed architecture. It means that it is specific to a company brand, whether that is software, hardware or both. For example, in order to use Allen Bradley PLC’s you need software from that company.
This type of PLC has a set number of inputs and outputs.
A type of volatile memory. This type of memory is used so that information can be written into or read from the memory. Considered to be temporary.
The part of a PLC which data and instructions are stored either temporarily or semi-permanently. Based on electromagnetic relays wiring.
This type of signal is not limited to on or off. It ranges between 2 set points.
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