CN110597050B - Intelligent safety input module - Google Patents
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- CN110597050B CN110597050B CN201910999011.8A CN201910999011A CN110597050B CN 110597050 B CN110597050 B CN 110597050B CN 201910999011 A CN201910999011 A CN 201910999011A CN 110597050 B CN110597050 B CN 110597050B
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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 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 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; the fault rejection module receives 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 the software and hardware of the input module are in fault, and ensures the fault safety guiding of the module. And the comprehensive fault detection means improves the fault detection coverage rate.
Description
Technical Field
The invention relates to the field of computer safety and technology, in particular to an intelligent safety input module.
Background
The safety input module is an important component of the 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 unsafe input module only focuses on the filtering, preprocessing and signal conversion of the collected signals, and the input module is required to work reliably and collect accurately, and does not focus on the consequences of module faults. The safety input module not only reliably works and accurately collects, but also considers the safety guidance of the collection value when the internal components of the module are in fault, such as the collection of signal lamps, the collection value is red light or green light according to the difference of information input during normal operation, and the information collection value is red light or fault when the input module is in fault, so that the condition that the red light is collected as green light due to circuit fault does not occur.
The implementation of the security input module generally needs to meet the requirements of three aspects, namely physical, functional and sufficient independence in flow; the validity of the fault detection and rejection mechanism; the protection device has good protection effect on any software and hardware static faults including errors. The drawbacks of the design implementation of the security input module are also generally manifested in the three aspects described above: physical or electromagnetic coupling connection exists among the sub-items, and external common mode interference is introduced without effective protection; the failure detection coverage is insufficient, and the rejection circuit cannot ensure that the system is effectively guided to the safety 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 view of 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 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 are communicated through an isolated synchronous check channel and are respectively communicated 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; the fault rejection module receives dynamic pulse signals output by the first logic processing module and the second processing module and is used for outputting power on-off control of 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 drive isolation module, a first fault detection module and a first acquisition logic switching control module which are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, a second communication drive 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 an RMII interface, 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 are communicated with the control layer, and the CPU-1 sub-processing unit receives the command of the control layer and transmits the acquired data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated through the isolation CAN transceiver, verification and check of data among sub-modules are realized.
The first fault detection module and the second fault detection module respectively comprise CPU self detection and detection of IO power supply voltage, CPU core power supply voltage and clock of the CPU by adopting a power management chip, monitoring of circuit voltage and current by adopting LTC2991, detection of temperature by adopting MAX31826 chip, and CPU self detection 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 power 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, and 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 is controlled to control the on-off of the power supply.
The first acquisition module comprises a first preprocessing circuit, a first signal acquisition conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition conversion and a second isolation circuit; the acquisition signals sequentially pass through a preprocessing circuit, a signal acquisition conversion circuit and an isolation circuit.
The preprocessing circuit comprises a first resistor R1, a second resistor R2, a fourth capacitor C4 and a third diode VD3 respectively, 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 respectively, and the other end of the fourth capacitor and the anode of the fourth diode are connected with the other end of the first resistor respectively; the isolation circuit and the signal acquisition circuit comprise two photoelectric isolators and two inverters, wherein one photoelectric isolator is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the inverter G1, and the other photoelectric isolator is connected with the acquisition logic switching control circuit through the inverter G2, and the output is connected with the preprocessing circuit.
The acquisition ports of the first acquisition module and the second acquisition module are provided with EMC protection circuits.
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 the software and hardware of the input module are in fault, and ensures the fault safety guiding of the module.
3. And the comprehensive fault detection means improves the fault detection coverage rate.
Drawings
Fig. 1 is a functional block diagram of the present invention.
Fig. 2 is a functional block diagram provided by an embodiment of the present invention.
Fig. 3 is a flow chart of the operation of the present invention.
Fig. 4 is a circuit diagram of a communication drive 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 invention will be described in further detail with reference to the drawings and the detailed description.
An intelligent safety input module 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 acquisition module and the second acquisition module acquire input signals respectively and transmit the received input signals to the first logic processing module and the second logic processing module respectively; 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 are communicated through an isolated synchronous check channel and are respectively communicated with the control layer, and are responsible for safety communication with the control layer, data acquisition processing and control; the fault rejection module receives dynamic pulse signals output by the first logic processing module and the second processing module and is used for outputting power on-off control of 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 drive isolation module, a first fault detection module and a first acquisition logic switching control module which are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, a second communication drive 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 an RMII interface, and the network controller is connected with a network transformer (HX 1198 NL); the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated by the network transformer and then are communicated with the control layer, and the CPU-1 sub-processing unit receives the command of the control layer and transmits the acquired data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated through an isolating CAN transceiver LTM2889, verification and check of data among sub-modules are realized.
The first fault detection module and the second fault detection module both adopt a power management chip TPS65381 to detect IO power supply voltage of a CPU, CPU core power supply voltage and a clock, adopt an LTC2991 to monitor circuit voltage and current, and adopt a MAX31826 chip to detect temperature. The CPU-1 sub-processing unit and the CPU-2 sub-processing unit are both selected from a safe CPU chip TMS570LS3173, and also comprise CPU self-detection, and mainly rely on software for self-diagnosis, for example, the safe CPU chip TMS570LS3173 is selected, the inside of the chip provides a means for hardware detection, and the software can judge the fault state of a related module by utilizing a fault detection mechanism, so that the software self-diagnosis is in 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 power 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 and connected with a normally open contact of the fault relay K1 which is respectively connected with the power supplies of the first communication driving isolation module and the second communication driving isolation module, and the on-off of the power supply is controlled. The dynamic pulse output by the CPU-1 is subjected to photoelectric isolation and then drives a rectifying circuit at a later stage to provide power for a photoelectric isolation part in the rectifying circuit controlled by the dynamic pulse output by the CPU-2, and only under the condition that 2 paths of dynamic pulses exist, the fault relay K1 is electrified and closed, a control contact of the fault relay K1 supplies power for the first communication driving isolating circuit and the second communication driving isolating circuit, any submodule is in fault, the dynamic pulse is removed, and the first communication driving isolating circuit and the second communication driving isolating circuit lose electricity, so that the input module is ensured not to influence the work of a control layer or send error data acquisition information to the control layer. The lower part of the circuit is a rechecking circuit which detects the working state of the fault relay by using the residual node of the relay K1, and sends the working state of the fault relay to the CPU-1 and the CPU-2 for confirming the state of the fault relay after photoelectric isolation.
The first acquisition module comprises a first preprocessing circuit, a first signal acquisition conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition conversion and a second isolation circuit; the acquisition signals sequentially pass through a preprocessing circuit, a signal acquisition conversion circuit and an isolation 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, the first signal acquisition circuit, the second isolation circuit and the second acquisition circuit respectively comprise two photoelectric isolators and two inverters, wherein one photoelectric isolator is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the inverter G1, and the other photoelectric isolator is connected with the acquisition logic switching control circuit through the inverter G2, and the output is connected with the preprocessing circuit. As shown in fig. 7, the acquisition and conversion of the digital input signal are actually completed by optocouplers OP1, OP2 and G1, G2, and after the code output pulse is driven by G2, the digital input signal is controlled to be converted into a pulse signal recognizable by the CPU by OP1, shaped by G1 and transmitted to the CPU for processing.
The acquisition ports of the first acquisition module and the second acquisition module are provided with ENC protection circuits, input port signals are used for suppressing interference signals through piezoresistors and TVSs (transient suppression diodes), and the signals are connected to the rear-stage acquisition module through L1 and C3 filtering, so that external interference caused by electromagnetism, static electricity, power supply, external input and output and the like is prevented.
The rectification circuit comprises a transformer, a capacitor C1, a capacitor C2, a diode VD1 and a diode VD2; one end of a capacitor C1 is connected with the cathode of the diode VD1 and the anode of the diode VD2 respectively, the cathode of the diode VD2 is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the anode of the diode VD1, the anode of the diode VD1 is connected with one end of a transformer secondary winding, and the other end of the capacitor C1 is connected with the other end of the transformer secondary winding.
The working flow of the intelligent safety output module is as follows: the power-on-fault detection circuit detects the working states of voltage, current, temperature, clock and the like, namely normal, the CPU subunits (CPU-1 and CPU-2) are powered on, the CPU subunits detect the related RAM and the working states of communication, normal, detect the working states of a collecting part, normal, detect the power supply state of an input signal, normal, send dynamic pulses to a fault rejection module, switch on the power supply of a communication driving isolation module, receive the command of a control layer, collect data and transmit collected data. And (3) periodically detecting the state of the circuit during the period, sending the self fault state when the fault condition occurs, and stopping sending the dynamic pulse to the fault rejecting circuit when the fault condition is serious, cutting off the power supply of the communication driving part and guiding the communication driving part to a safe state.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several changes and modifications can be made without departing from the general inventive concept, and these should also be regarded as the scope of the invention.
Claims (6)
1. An intelligent safe input module which is 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 are communicated through an isolated synchronous check channel and are respectively communicated 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; the fault rejection module receives dynamic pulse signals output by the first logic processing module and the second processing module and is used for outputting power on-off control of 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 drive isolation module, a first fault detection module and a first acquisition logic switching control module which are connected with the CPU-1 sub-processing unit; the second logic processing module comprises a CPU-2 sub-processing unit, a second communication drive 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 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 power 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 and controls the normally open contact of the fault relay (K1) respectively connected with the power supplies of the first communication driving isolation module and the second communication driving isolation module to control the on-off of the power supply.
2. The intelligent security input module of claim 1, 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 an RMII interface, 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 are communicated with the control layer, and the CPU-1 sub-processing unit receives the command of the control layer and transmits the acquired data; meanwhile, after CAN control signals of the CPU-1 sub-processing unit and the CPU-2 sub-processing unit are isolated through the isolation CAN transceiver, verification and check of data among sub-modules are realized.
3. The intelligent security input module of claim 1, wherein: the first fault detection module and the second fault detection module respectively comprise CPU self detection and detection of IO power supply voltage, CPU core power supply voltage and clock of the CPU by adopting a power management chip, monitoring of circuit voltage and current by adopting LTC2991, detection of temperature by adopting MAX31826 chip, and CPU self detection comprises RAM, FLASH, voltage and clock monitoring.
4. The intelligent security input module of claim 1, wherein: the first acquisition module comprises a first preprocessing circuit, a first signal acquisition conversion circuit and a first isolation circuit; the second acquisition module comprises a second preprocessing circuit, a second signal acquisition conversion and a second isolation circuit; the acquisition signals sequentially pass through a preprocessing circuit, a signal acquisition conversion circuit and an isolation circuit.
5. The intelligent security input module of claim 4, wherein: the pretreatment circuit comprises a first resistor (R1), a second resistor (R2), a fourth capacitor (C4) and a third diode (VD 3) respectively, 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 third diode respectively, and the other end of the fourth capacitor and the anode of the third diode are connected with the other end of the first resistor respectively; the isolation circuit and the signal acquisition circuit comprise two photoelectric isolators and two inverters, wherein one photoelectric isolator is connected with the signal preprocessing circuit, the output is connected with the acquisition logic switching control circuit through the inverter G1, and the other photoelectric isolator is connected with the acquisition logic switching control circuit through the inverter G2, and the output is connected with the preprocessing circuit.
6. The intelligent security input module of claim 1, wherein: the acquisition ports of the first acquisition module and the second acquisition module are provided with EMC protection circuits.
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