CN110597050A - Intelligent safe input module - Google Patents
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- CN110597050A CN110597050A CN201910999011.8A CN201910999011A CN110597050A CN 110597050 A CN110597050 A CN 110597050A CN 201910999011 A CN201910999011 A CN 201910999011A CN 110597050 A CN110597050 A CN 110597050A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
- G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
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Abstract
An intelligent safety input module comprises a submodule A, a submodule B and a fault rejection module which are the same and independent; the sub-module A comprises a first acquisition module and a first logic processing module, and the sub-module B comprises a second acquisition module and a second logic processing module; the first logic processing module and the second logic processing module respectively receive the acquired data sent by the first acquisition module and the second acquisition module and respectively send dynamic test control codes to the first acquisition module and the second acquisition module; and the fault rejection module receives the dynamic pulse signals output by the first logic processing module and the second processing module. The intelligent processing means enhances the means of system acquisition control and fault detection, and shortens the response time of fault rejection. The independent fault rejection circuit avoids the influence on the whole system when software and hardware of the input module have faults, and ensures the fault safety guidance of the module. And by means of comprehensive fault detection, the fault detection coverage rate is improved.
Description
Technical Field
The invention relates to the field of computer security and technology, in particular to an intelligent security input module.
Background
The safety input module is an important component of a safety computer system, is an interface for the system to acquire information, and is a basis for ensuring the safe and reliable operation of the system. The non-safety input module only focuses on filtering, preprocessing and signal transformation of the acquired signals, and the input module is required to work reliably and acquire accurately without focusing on the consequences of module failure. Besides reliable work and accurate collection, the safety input module also considers the safety guidance of the collected value when the module internal member fails, for example, the collected signal lamp is collected, the collected value is 'red lamp' or 'green lamp' when the safety input module normally works, and the collected value is 'red lamp' or 'failure' when the input module fails, and the situation that the 'red lamp' is collected as 'green lamp' due to circuit failure should not occur.
The realization of the safety input module generally needs to meet the requirements of three aspects, namely, the physical, functional and flow sufficient independence; the effectiveness of the failure detection and rejection mechanism; the method has good protection effect on any static faults of software and hardware including error retention. The drawbacks of the design implementation of the security input module are also generally manifested in the three aspects mentioned above: physical or electromagnetic coupling connection exists among all sub items, and external common mode interference is introduced without effective protection; the fault detection coverage is insufficient, and the rejection circuit cannot ensure that the system is effectively guided to the safe side due to self failure; static data acquisition and insertion value detection modes are used, and static faults of software and hardware cannot be effectively protected.
Disclosure of Invention
In order to solve the above problems, the present invention provides an intelligent security input module.
The object of the invention is achieved in the following way:
an intelligent safety input module comprises a submodule A, a submodule B and a fault rejection module which are the same and independent; the sub-module A comprises a first acquisition module and a first logic processing module, and the sub-module B comprises a second acquisition module and a second logic processing module; the first logic processing module and the second logic processing module communicate through an isolated synchronous check channel and respectively communicate with the control layer; the first logic processing module and the second logic processing module respectively receive the acquired data sent by the first acquisition module and the second acquisition module and respectively send dynamic test control codes to the first acquisition module and the second acquisition module; and the fault rejection module receives the dynamic pulse signals output by the first logic processing module and the second logic processing module and is used for outputting power supply on-off control to the first logic processing module and the second logic processing module.
The first logic processing module comprises a CPU-1 sub-processing unit, a first communication driving isolation module, a first fault detection module and a first acquisition logic switching control module, wherein the first communication driving isolation module, the first fault detection module and the first acquisition logic switching control module are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, and a second communication driving isolation module, a second fault detection module and a second acquisition logic switching control module which are connected with the CPU-2 sub-processing unit.
The first communication driving isolation module and the second communication driving isolation module respectively comprise a network controller and a network transformer connected with the network controller; the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are connected with a network controller through RMII interfaces, and the network controller is connected with a network transformer; the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the network transformer and then communicate with the control layer, receive control layer commands and transmit collected data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the isolated CAN transceiver, the verification and check of data between the sub-modules are realized.
The first fault detection module and the second fault detection module respectively comprise a CPU self-detection module and a power management chip for detecting IO power supply voltage, CPU core power supply voltage and a clock of the CPU, LTC2991 is used for monitoring circuit voltage and current, an MAX31826 chip is used for detecting temperature, and the CPU self-detection module comprises RAM, FLASH, voltage and clock monitoring.
The fault rejection module comprises a first photoelectric isolation connected with the CPU-1 sub-processing unit and a second photoelectric isolation connected with the CPU-2 sub-processing unit, wherein the output of the first photoelectric isolation is connected with the input of the rectifying circuit, the output of the rectifying circuit is connected with the second photoelectric isolation to provide a power supply for the rectifying circuit, the output of the second photoelectric isolation is connected with the fault relay K1, and when the CPU-1 sub-processing unit and the CPU-2 sub-processing unit output dynamic pulse signals, the fault relay K1 is electrically attracted to control the normally open contact of the fault relay K1 connected with the power supplies of the first output module and the second output module respectively, so as to control the on-off of the power supply.
The first acquisition module comprises a first preprocessing circuit, a first signal acquisition and conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition transformation circuit and a second isolation circuit; the collected signals sequentially pass through a preprocessing circuit, a signal collecting and converting circuit and an isolating circuit.
The preprocessing circuit comprises a first resistor R1, a second resistor R2, a fourth capacitor C4 and a third diode VD3 respectively, the input end of the second resistor is connected with one end of the first resistor, the output end of the second resistor is connected with one end of the fourth capacitor and the cathode of the fourth diode respectively, and the other end of the fourth capacitor and the anode of the fourth diode are connected and connected with the other end of the first resistor respectively; the isolation circuit and the signal acquisition circuit comprise two photoelectric isolations and two phase inverters, wherein one photoelectric isolated input is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the phase inverter G1, the other photoelectric isolated input is connected with the acquisition logic switching control circuit through the phase inverter G2, and the output is connected with the preprocessing circuit.
And the acquisition ports of the first acquisition module and the second acquisition module are provided with an EMC protection circuit.
The invention has the beneficial effects that: 1. the intelligent processing means enhances the means of system acquisition control and fault detection, and shortens the response time of fault rejection.
2. The independent fault rejection circuit avoids the influence on the whole system when software and hardware of the input module have faults, and ensures the fault safety guidance of the module.
3. And by means of comprehensive fault detection, the fault detection coverage rate is improved.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic block diagram provided by an embodiment of the invention.
Fig. 3 is a flow chart of the operation of the present invention.
Fig. 4 is a circuit diagram of a communication driver isolation module of the present invention.
Fig. 5 is a circuit diagram of a fault rejection module.
Fig. 6 is a circuit diagram of a fault detection circuit.
Fig. 7 is a circuit diagram of an acquisition module.
Fig. 8 is an EMC protection circuit diagram.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
An intelligent safety input module comprises a submodule A, a submodule B and a fault rejection module which are the same and independent; the sub-module A comprises a first acquisition module and a first logic processing module, and the sub-module B comprises a second acquisition module and a second logic processing module; the first acquisition module and the second acquisition module respectively acquire input signals and respectively transmit the received input signals to the first logic processing module and the second logic processing module; the first logic processing module and the second logic processing module respectively send dynamic test control codes to the first acquisition module and the second acquisition module; the first logic processing module and the second logic processing module communicate through an isolated synchronous check channel, and respectively communicate with the control layer to be responsible for safety communication, data acquisition processing and control with the control layer; and the fault rejection module receives the dynamic pulse signals output by the first logic processing module and the second logic processing module and is used for outputting power supply on-off control to the first logic processing module and the second logic processing module.
The first logic processing module comprises a CPU-1 sub-processing unit, a first communication driving isolation module, a first fault detection module and a first acquisition logic switching control module, wherein the first communication driving isolation module, the first fault detection module and the first acquisition logic switching control module are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, and a second communication driving isolation module, a second fault detection module and a second acquisition logic switching control module which are connected with the CPU-2 sub-processing unit.
The first communication driving isolation module and the second communication driving isolation module respectively comprise a network controller and a network transformer connected with the network controller; the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are connected with a network controller (KSZ 8863) through RMII interfaces, and the network controller is connected with a network transformer (HX1198 NL); the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the network transformer and then communicate with the control layer, receive control layer commands and transmit collected data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by an isolation CAN transceiver LTM2889, the verification and check of data between sub-modules are realized.
The first fault detection module and the second fault detection module respectively adopt a power management chip TPS65381 to detect IO power supply voltage of a CPU, CPU core power supply voltage and a clock, adopt LTC2991 to monitor circuit voltage and current, and adopt an MAX31826 chip to detect temperature. The CPU-1 sub-processing unit and the CPU-2 sub-processing unit both adopt a safe CPU chip TMS570LS3173, and also comprise CPU self-detection, wherein self-diagnosis is mainly carried out by software, for example, the safe CPU chip TMS570LS3173 is selected, the internal part of the chip provides a means for hardware detection, and the software can judge the fault state of a related module by using a fault detection mechanism thereof, and the software self-diagnosis is the prior art.
The fault rejection module comprises a first photoelectric isolation connected with the CPU-1 sub-processing unit and a second photoelectric isolation connected with the CPU-2 sub-processing unit, wherein the output of the first photoelectric isolation is connected with the input of the rectifying circuit, the output of the rectifying circuit is connected with the second photoelectric isolation to provide a power supply for the rectifying circuit, the output of the second photoelectric isolation is connected with the fault relay K1, and when the CPU-1 sub-processing unit and the CPU-2 sub-processing unit output dynamic pulse signals, the fault relay K1 is electrically attracted to control the normally open contact of the fault relay K1 connected with the power supply of the first communication driving isolation module and the second communication driving isolation module respectively, so as to control the on-off of the power supply. The dynamic pulse output by the CPU-1 is subjected to photoelectric isolation and then drives a rear-stage rectifying circuit to provide a power supply for a photoelectric isolation part in the rectifying circuit controlled by the dynamic pulse output by the CPU-2, only under the condition that 2 paths of dynamic pulses exist, the fault relay K1 is electrified and attracted, a control contact of the fault relay K1 supplies power for the first communication driving isolation circuit and the second communication driving isolation circuit, any sub-module is in fault, the dynamic pulse is removed, and the first communication driving isolation circuit and the second communication driving isolation circuit lose power, so that the input module is ensured not to influence the work of a control layer or send wrong data acquisition information to the control layer. The lower part of the circuit is a return detection circuit which detects the working state of a fault relay by using the residual nodes of the relay K1, and sends the working state to the CPU-1 and the CPU-2 to confirm the state of the relay after photoelectric isolation.
The first acquisition module comprises a first preprocessing circuit, a first signal acquisition and conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition transformation circuit and a second isolation circuit; the collected signals sequentially pass through a preprocessing circuit, a signal collecting and converting circuit and an isolating circuit.
The first preprocessing circuit and the second preprocessing circuit respectively comprise a first resistor R1, a second resistor R2, a fourth capacitor C4 and a third diode VD3, the input end of the second resistor is connected with one end of the first resistor, the output end of the second resistor is respectively connected with one end of the fourth capacitor and the cathode of the fourth diode, and the other end of the fourth capacitor and the anode of the fourth diode are respectively connected with the other end of the first resistor; the first isolation circuit and the first signal acquisition circuit, and the second isolation circuit and the second acquisition circuit respectively comprise two photoelectric isolations and two phase inverters, wherein one photoelectric isolated input is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the phase inverter G1, the other photoelectric isolated input is connected with the acquisition logic switching control circuit through the phase inverter G2, and the output is connected with the preprocessing circuit. As shown in fig. 7, the acquisition and conversion of the acquisition module circuit for digital input signals are actually completed by the optical couplers OP1, OP2, G1 and G2, and the code-sending output pulse is driven by G2, then the OP1 and OP2 are controlled to convert the digital input signals into pulse signals recognizable to the CPU, and the pulse signals are shaped by G1 and then transmitted to the CPU for processing.
The acquisition ports of the first acquisition module and the second acquisition module are provided with an ENC protection circuit, and input port signals are subjected to suppression on interference signals through a voltage dependent resistor and a TVS (transient suppression diode), and are connected to the rear-stage acquisition module through L1 and C3 filtering, so that external interference caused by electromagnetism, static electricity, a power supply, external input and output and the like is prevented.
The rectifying circuit comprises a transformer, a capacitor C1, a capacitor C2, a diode VD1 and a diode VD 2; one end of a capacitor C1 is connected with the cathode of a diode VD1 and the anode of a diode VD2 respectively, the cathode of a diode VD2 is connected with one end of a capacitor C2, the other end of a capacitor C2 is connected with the anode of a diode VD1, the anode of a diode VD1 is connected with one end of a secondary winding of the transformer, and the other end of the capacitor C1 is connected with the other end of the secondary winding of the transformer.
The work flow of the intelligent safety output module is as follows: the power-on-fault detection circuit detects the working state of voltage, current, temperature, clock, etc. -normal-CPU subunit (CPU-1 and CPU-2) is powered-CPU subunit detects its related RAM, working state of communication-normal-detects the working state of collection part-normal-detects the power supply state of input signal-normal-sends dynamic pulse to fault rejection module-connects communication drive isolation module power-receives control layer command-data collection-transmits collected data. And periodically detecting the state of the circuit in the period, sending the self fault state when a fault condition occurs, stopping sending dynamic pulses to the fault rejection circuit when the fault condition is serious, cutting off the power supply of a communication driving part, and guiding to a safe state.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (8)
1. An intelligent security input module, its characterized in that: the system comprises two identical and independent sub-modules A and B and a fault rejection module; the sub-module A comprises a first acquisition module and a first logic processing module, and the sub-module B comprises a second acquisition module and a second logic processing module; the first logic processing module and the second logic processing module communicate through an isolated synchronous check channel and respectively communicate with the control layer; the first logic processing module and the second logic processing module respectively receive the acquired data sent by the first acquisition module and the second acquisition module and respectively send dynamic test control codes to the first acquisition module and the second acquisition module; and the fault rejection module receives the dynamic pulse signals output by the first logic processing module and the second logic processing module and is used for outputting power supply on-off control to the first logic processing module and the second logic processing module.
2. The intelligent secure input module of claim 1, wherein: the first logic processing module comprises a CPU-1 sub-processing unit, a first communication driving isolation module, a first fault detection module and a first acquisition logic switching control module, wherein the first communication driving isolation module, the first fault detection module and the first acquisition logic switching control module are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, and a second communication driving isolation module, a second fault detection module and a second acquisition logic switching control module which are connected with the CPU-2 sub-processing unit.
3. The intelligent secure input module of claim 2, wherein: the first communication driving isolation module and the second communication driving isolation module respectively comprise a network controller and a network transformer connected with the network controller; the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are connected with a network controller through RMII interfaces, and the network controller is connected with a network transformer; the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the network transformer and then communicate with the control layer, receive control layer commands and transmit collected data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the isolated CAN transceiver, the verification and check of data between the sub-modules are realized.
4. The intelligent secure input module of claim 2, wherein: the first fault detection module and the second fault detection module respectively comprise a CPU self-detection module and a power management chip for detecting IO power supply voltage, CPU core power supply voltage and a clock of the CPU, LTC2991 is used for monitoring circuit voltage and current, an MAX31826 chip is used for detecting temperature, and the CPU self-detection module comprises RAM, FLASH, voltage and clock monitoring.
5. The intelligent secure input module of claim 1, wherein: the fault rejection module comprises a first photoelectric isolation connected with the CPU-1 sub-processing unit and a second photoelectric isolation connected with the CPU-2 sub-processing unit, wherein the output of the first photoelectric isolation is connected with the input of the rectifying circuit, the output of the rectifying circuit is connected with the second photoelectric isolation to provide a power supply for the rectifying circuit, the output of the second photoelectric isolation is connected with the fault relay (K1), and when the CPU-1 sub-processing unit and the CPU-2 sub-processing unit output dynamic pulse signals, the fault relay (K1) is electrified and attracted to control the normally open contact of the fault relay (K1) respectively connected with the power supplies of the first output module and the second output module to control the on-off of the power supply.
6. The intelligent secure input module of claim 1, wherein: the first acquisition module comprises a first preprocessing circuit, a first signal acquisition and conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition transformation circuit and a second isolation circuit; the collected signals sequentially pass through a preprocessing circuit, a signal collecting and converting circuit and an isolating circuit.
7. The intelligent secure input module of claim 6, wherein: the preprocessing circuit comprises a first resistor (R1), a second resistor (R2), a fourth capacitor (C4) and a third diode (VD 3), wherein the input end of the second resistor is connected with one end of the first resistor, the output end of the second resistor is connected with one end of the fourth capacitor and the cathode of the fourth diode, and the other end of the fourth capacitor and the anode of the fourth diode are connected and connected with the other end of the first resistor; the isolation circuit and the signal acquisition circuit comprise two photoelectric isolations and two phase inverters, wherein one photoelectric isolated input is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the phase inverter G1, the other photoelectric isolated input is connected with the acquisition logic switching control circuit through the phase inverter G2, and the output is connected with the preprocessing circuit.
8. The intelligent secure input module of claim 1, wherein: and the acquisition ports of the first acquisition module and the second acquisition module are provided with an EMC protection circuit.
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Cited By (1)
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| CN112327147A (en) * | 2020-09-14 | 2021-02-05 | 南京铁道职业技术学院 | Input circuit for signal safety equipment |
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