A control system is configured by two-way communication conducted between a controller and a display terminal for displaying an operating state of the controller, and includes a processing time managing unit configured to measure time taken for processing pieces of data received from another end, and obtain from the other end and manage time taken on the other end for processing the pieces of data sent to the other end, and a congestion control unit configured to adjust a data sending amount to the other end per unit time based on the time taken for processing the pieces of data on the other end which are managed by the processing time managing unit.

The invention relates to an input module (32) for a programmable logic controller able to be connected to a plurality of elements of an automated chain, the module (32) comprising: inputs (32A, 32B), each input (32A, 32B) being able to receive the signal from at least one element of the plurality of elements, interfaces (40A, 40B), each interface (40A, 40B) being associated with a single input and comprising at least one output (40A6, 40B6) able to operate in three different states, a test block (42), and a processing sub-module (24) able to compare the state of the output (40A6, 40B6) of each interface (40A, 40B) with the state imposed by the test block (42) and to deduce an operating anomaly of the module (32, 34) therefrom.

A control system is configured by two-way communication conducted between a controller and a display terminal for displaying an operating state of the controller, and includes a processing time managing unit configured to measure time taken for processing pieces of data received from another end, and obtain from the other end and manage time taken on the other end for processing the pieces of data sent to the other end, and a congestion control unit configured to adjust a data sending amount to the other end per unit time based on the time taken for processing the pieces of data on the other end which are managed by the processing time managing unit.