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The programmable logic controller or Programmable Logic Controller (PLC) is a computer industry specialist in home management of industrial process control equipment required by a plant's control systems, industrial safety, with the study of time reaction, and the movement of the output response of the system, processing parameters that allow you to "adjust" the answer with feedback or negative feedback, and then going to modulate the output of the actuator.
A more secure alternative is the use of redundant CPUs within one system or the operation of several systems between their cluster (cluster) so as to contribute all the elaboration of the same application. In the case where the systems connected to cluster are in their turn of type SMP this configuration takes the name of Massive Parallel Processor (MPP).
The structure of the PLC is adjusted according to the process to be automated, when designing the control system, cards are chosen to fit sizes Electric.
The CPU of the controller is a card based on a complex programmable logic with basic functionality of storage and access to the I / O, as well as bootloader and with an area of ​​memory available to the user program, during normal operation, the PLC communicates with all the tabs connected to the BUS transferring and receiving data.


CPU-F (Fail-safe)
Fail-safe controllers are used to ensure the functional safety of plant or machinery, they meet the high security requirements and comply with standards: EN 954-1 up to Cat. 4, IEC 62061 up to SIL 3 and EN ISO 13849-1 up to PL e.
The simultaneous treatment of the standard and safety program means that a single CPU and enough to handle both tasks.


Reduction of stock-keeping, the coexistence of standard and safety programs in same controller, a transmission PROFIBUS or PROFINET standard means of communication and security SIL3/Category 4.
More flexibility: the logic of security features is a software based rather than hard-wired logic of implementation ensuring the security complex.