Driving control circuit and industrial control equipment

Abstract

The invention discloses a driving control circuit and industrial control equipment. The driving control circuit comprises a microprocessor, a signal retaining circuit and a relay driving module, and is characterized in that a control signal end of the microprocessor is connected with a signal input end of the signal retaining circuit, and a signal output end of the signal retaining circuit is connected with a driving trigger end of the relay driving module; the control signal end of the microprocessor outputs control level to the signal retaining circuit, and the signal retaining circuit outputs corresponding driving level to the driving trigger end of the relay driving module according to the received control level so as to trigger the relay driving module to open or disconnect driving output; the signal retaining circuit maintains the level state of the signal input end thereof to be unchanged when reset occurs in the microprocessor; and the microprocessor reads the level state of the control signal end thereof after resetting, and configures the control signal end to be level signals with the state being identical to the read level state to output. The technical scheme disclosed by the invention can ensure the operation reliability of a relay.

Description

technical field

[0001] The invention relates to the field of electronic technology, in particular to a drive control circuit and industrial control equipment. Background technique

[0002] At present, there are a large number of circuits that use MCU output to drive relays in the field of industrial automation control. Usually, in order to improve the driving capability of MCU or protect the safety of MCU, only a driving circuit (or chip or isolated drive) is added between the MCU and the relay. This kind of relay driving method has the following problems: MCU may reset and restart due to external interference or unreliable MCU program design, resulting in no signal output from the driving circuit to the relay, which in turn leads to the release action of the relay being driven, and the reliability of the relay. Sexuality cannot be guaranteed; if the relay is driving a key device at this time, it may even lead to a very serious safety accident. Contents of the invention ...

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