Input module for programmable logic controller
AssigneeSchneider Electric Industries SAS
InventorsGerard GOMEZ, Pascal CHAPIER
Life of this patent
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Abstract
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.
Claims11
An input module for a programmable logic controller able to be connected to a plurality of elements of an automated chain, the input module comprising:
- inputs, each input being able to receive the signal from at least one element of the plurality of elements,
- interfaces, each interface being associated with a single input and comprising at least one output able to operate in three different states:
- a forcing state corresponding to the maximum voltage that the output of the interface is able to deliver,
- a low state corresponding to the minimum voltage that the output of the interface is able to deliver, and
- a read state in which the output of the interface is able to deliver an image of the signal received by the input associated with the considered interface,
- a test block connected to each of the interfaces and able to impose the state of the output of each interface, and
- a processing sub-module able to compare the state of the output of each interface with the state imposed by the test block and to deduce an operating anomaly of the input module therefrom when the state of the output of at least one interface differs from the state imposed by the test block.
A testing method for an input module for a programmable logic controller able to be connected to a plurality of elements of an automated chain, the input module comprising:
- inputs, each input being able to receive the signal from at least one element of the plurality of elements,
- interfaces, each interface being associated with a single input and comprising at least one output able to operate in three different states:
- a forcing state corresponding to the maximum voltage that the output of the interface is able to deliver,
- a low state corresponding to the minimum voltage that the output of the interface is able to deliver, and
- a read state in which the output of the interface is able to deliver an image of the signal received by the input associated with the considered interface,
- a test block connected to each of the interfaces and able to impose the state of the output of each interface, and
- a processing sub-module able to compare the state of the output of each interface with the state imposed by the test block and to deduce an operating anomaly of the input module therefrom when the state of the output of at least one interface differs from the state imposed by the test block,
- the method comprising the following steps:
- imposing a forcing state on each output of each interface,
- verifying the operating state of the input module when a forcing state is imposed on each output of each interface,
- imposing a low state on each output of each interface,
- verifying the operating state of the input module when a low state is imposed on each output of each interface, and
- deducing the operating state of the first input module based on the results of the verification steps.
Dependencies are inferred from the claim text.