Modular safety programmable logic controller

Abstract

The invention discloses a modular safety programmable logic controller comprising a main control module, an input module, an output module and safety modules, wherein the input module is connected to the safety modules, the main control module is connected to the safety modules; the safety modules are connected to the output module; the output module is connected with external safety equipment; the main control module comprises a switch module and a processor module; the processor module comprises a functional block storage unit and a ladder circuit; the switch module at least comprises a switch unit; the switch unit is provided with N pairs of N switches connected with a serial communication line. The switch module and the processor module form a start-type serial communication network, and influences of interaction, crosstalk and ground wire bounce are not considered. The transmission performance of a bus will not be decreased when the number of connection modules is increased. In addition, serial communication lines between each safety module and the switch module and between the processor module and the switch module can serve as multiple parallel circuits, and the optimal data communication capacity is ensured.

Description

technical field [0001] The invention relates to the electrical field, in particular to a programmable logic controller, in particular to a modular safety programmable logic controller. Background technique [0002] In the prior art, in the control system, multiple programmable logic controllers communicate with each other in the way of parallel bus, serial bus or storage relay. However, due to the constraints of the bus structure, as the number of connected modules increases, the transmission performance of multiple programmable logic controllers when data flows into the bus is significantly reduced. Especially in security systems, a reduction in data transfer performance affects the corresponding speed of the security device. Invention content: [0003] The technical problem to be solved by the present invention is to provide a modular safety programmable logic controller. The modular safety programmable logic controller needs to solve the problem of data flow into the b...

AI Technical Summary

Problems solved by technology

However, due to the constraints of the bus structure, as the number of connected modules increases, the transmission performance of multiple programmable logic controllers when data flows into the bus is significantly reduced

Especially in security systems, reduced data transfer performance can affect the corresponding speed of security devices

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