CN105759678B - The switching value output module of DCS system - Google Patents
The switching value output module of DCS system Download PDFInfo
- Publication number
- CN105759678B CN105759678B CN201510904735.1A CN201510904735A CN105759678B CN 105759678 B CN105759678 B CN 105759678B CN 201510904735 A CN201510904735 A CN 201510904735A CN 105759678 B CN105759678 B CN 105759678B
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- circuit
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- switching value
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25232—DCS, distributed control system, decentralised control unit
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
- Power Sources (AREA)
- Devices For Supply Of Signal Current (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a kind of switching value output modules of DCS system, including power supply, CPU module, power on delay circuit, telecommunication circuit and digital quantity output channel circuit, the power supply is used to power to entire switching value output module, the CPU module is used to be communicated by the control station of telecommunication circuit and DCS system, the CPU module gives digital output channel circuit for exporting control signal, for digital output channel circuit to be controlled to export on-off model to field device, the power on delay circuit is used to receive reset signal, postpone to be powered to digital output channel circuit.It can record state before reset, consistent before output state can keep and reset after reset.
Description
Technical field
The present invention relates to DCS control systems field, more particularly to a kind of switching value output module of DCS system.
Background technology
In DCS control systems, it is very universal that DO switching value output modules, which use,.It is frequently encountered in the field due to one
A little special circumstances, module need electrification reset, such as module to be broken, and need to change the mold block online or without power supply redundant system
Piezoelectric voltage is too low for a period of time that power module is caused to be stopped for power module damage or industry in, after waiting recoveries normal
Rework etc..Because module resets moment, ordinary circumstance, output channel are faster than CPU, that is to say, that in CPU, there are no complete
Into when initialization, output channel has had value output so that output state is not known after reset, leads to the valve being controlled by
The equipment such as door tamper the danger of work.Conventional method is that, until conditions permit, controlled device bounce carries out again when allowing
The operation of module resets.Shortcoming of the existing technology be when some important application scenarios, only maintenance down
It can carry out the replacement or reset of switching value output module.The line of all channels of module is dismantled, is waited after the completion of operations again
It connects.It or in this way can not timely processing problem or more complicated.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to a kind of switching value output module of DCS system is provided,
State before resetting can be recorded, it is consistent before output state can keep and reset after reset.
The object of the present invention is achieved like this：A kind of switching value output module of DCS system, including power supply, CPU
Module, power on delay circuit, telecommunication circuit and digital quantity output channel circuit, the power supply are used for defeated to entire switching value
Go out module for power supply, the CPU module for being communicated by the control station of telecommunication circuit and DCS system, use by the CPU module
In export control signal give digital output channel circuit, for control digital output channel circuit export on-off model to
Field device, controls the working condition of field device, and the power on delay circuit postpones for receiving reset signal to digital quantity
Output channel power on circuitry.
The power on delay circuit includes first switch pipe Q1, second switch pipe VT13 and several resistance, capacitance, described
The base stage of first switch pipe Q1 is connect with one end of the 10th resistance R10, the other end of the 10th resistance R10 respectively with the 19th resistance
One end of R19, one end of the 19th capacitance C19 and reset signal connection, the other end and the power supply VCC of the 19th resistance R19
Connection, the other end ground connection of the 19th capacitance C19, the emitter of the first switch pipe Q1 connect with power supply VCC, and described the
The one end of the collector of one switching tube Q1 respectively with the base stage of second switch pipe VT13, the 9th resistance R9 is connect, the 9th resistance R9's
The other end is grounded, and the base stage of the second switch pipe VT13 connects respectively with the cathode of one end of the 8th resistance R8, the 42nd capacitance C42
It connects, the other end of the 8th resistance R8, the anode of the 42nd capacitance C42 are connect with power supply VCC, the second switch pipe VT13
Emitter connect with power supply VCC, the collector of second switch pipe VT13 and the power end of digital output channel circuit
Connection.
The first isolation circuit is equipped between the CPU module and telecommunication circuit.
The second isolation circuit is equipped between the CPU module and digital output channel circuit.
It is described since the switching value output module of this DCS system is equipped with power on delay circuit as a result of said program
Power on delay circuit postpones to give digital output channel circuit energization for receiving reset signal.When the switch of this DCS system
When measuring output module electrification reset, the control digital output channel circuit delay of power on delay circuit is powered, and makes digital output
Channel circuit is resetting the period without output, and after the completion of the switching value output module electrification reset of this DCS system, CPU module will
It according to the output state before reset, sends analog value on digital output channel circuit, channel control loop is postponing at this time
Just there is electricity under circuit function, before the output state value after the switching value output module reset of DCS system can be made in this way and resetted
Output state value is identical, and the equipment such as the valve being controlled by is avoided to tamper the danger of work.
The invention will be further described with reference to the accompanying drawings and detailed description.
Description of the drawings
Fig. 1 is the functional block diagram of the switching value output module of the present invention；
Fig. 2 is the circuit diagram of the power on delay circuit of the present invention.
Specific embodiment
Referring to Fig. 1, a kind of switching value output module of DCS system, including power supply, CPU module, power on delay electricity
Road, telecommunication circuit and digital quantity output channel circuit, the power supply is used to power to entire switching value output module, described
CPU module receives the control letter of the control station of DCS system for being communicated by the control station of telecommunication circuit and DCS system
Number.Telecommunication circuit is the circuit to communicate.It can be communicated by its CPU with other intellectual products.Its core is to adopt
Communication chip, such as SP485 etc..It connects 485 buses of outside on one side, connects the isolation circuit on side on one side.The CPU moulds
Block gives digital output channel circuit for exporting control signal, for controlling digital output channel circuit defeated to field device
Go out on-off model.CPU module can export corresponding signal according to the output state value before reset.Digital output channel electricity
Road refers to the DO output signal channels of switching value output module, can be Level output signal or open collector output
Signal etc., effect are to export on-off model to scene.The power on delay circuit postpones for receiving reset signal to number
Measure output channel power on circuitry.When the switching value output module electrification reset of this DCS system, power on delay circuit control number
It measures output channel circuit delay to be powered, makes digital output channel circuit without output, when the switching value output module of this DCS system
After the completion of electrification reset, CPU module send corresponding signal to digital output channel circuit by according to the output state value before reset
On, make DCS system switching value output module reset after output state value with reset before output state value it is identical, avoid by
The equipment such as its valve controlled tamper the danger of work.The first isolation circuit is equipped between the CPU module and telecommunication circuit.It is described
The second isolation circuit is equipped between CPU module and digital output channel circuit.Second isolation circuit is that control signal is carried out
Isolation, the first isolation circuit is that signal of communication is isolated, and communication isolating is that the interference signal being isolated on communication line is allowed to
Core circuit cannot be entered.Control line isolation is to prevent the interference signal on channel from entering internal core circuit.Isolation is common
Have Phototube Coupling and Magnetic isolation.
Referring to Fig. 2, the power on delay circuit include first switch pipe Q1, second switch pipe VT13 and several resistance,
Capacitance, the base stage of the first switch pipe Q1 are connect with one end of the 10th resistance R10, the other end of the 10th resistance R10 respectively with
One end of 19th resistance R19, one end of the 19th capacitance C19 and reset signal connection, the other end of the 19th resistance R19 and power supply
Power supply VCC connections, the other end ground connection of the 19th capacitance C19, emitter and the power supply VCC of the first switch pipe Q1 connect
It connecing, the one end of the collector of the first switch pipe Q1 respectively with the base stage of second switch pipe VT13, the 9th resistance R9 is connect, and the 9th
The other end ground connection of resistance R9, the base stage of the second switch pipe VT13 respectively with one end of the 8th resistance R8, the 42nd capacitance C42
Cathode connection, the other end of the 8th resistance R8, the anode of the 42nd capacitance C42 connect with power supply VCC, and described second opens
The emitter for closing pipe VT13 is connect with power supply VCC, collector and the digital output channel circuit of second switch pipe VT13
Power end connection.
Referring to Fig. 2, reset signal RST（RST comes from the signal of cpu reset circuit in module）It is connect while introducing CPU
It has arrived on the R10 in figure, this signal will make Q1 in the transient switching powered on.As a result can allow on R9 have close to VCC level this
The base level of a level i.e. VT13, it can remain off VT13.It in this way, will be without electricity to the P1 of channel power supply
Pressure, digital output channel circuit will be without output.On the contrary.After the completion of RST resets, Q1 will be closed, and VT13 will be connected, and P1 leads to
Electricity is powered to digital output channel circuit.Meanwhile after the completion of RST resets, CPU will read the output state value before resetting
It is sent on digital output channel circuit, in this way after this process of top, the output valve after switching value output module reset
It will be the value before resetting.
The present invention is not limited solely to above-described embodiment, in the case of without departing substantially from technical solution of the present invention spirit into
The technical solution of row few modifications should fall into protection scope of the present invention.
Claims (4)
1. a kind of switching value output module of DCS system, it is characterised in that：Including power supply, CPU module, power on delay electricity
Road, telecommunication circuit and digital quantity output channel circuit, the power supply is used to power to entire switching value output module, described
For CPU module for being communicated by the control station of telecommunication circuit and DCS system, the CPU module controls signal for exporting
Digital output channel circuit is given, for digital output channel circuit to be controlled to export on-off model；When the switch of DCS system
When measuring output module electrification reset, for the power on delay circuit for receiving reset signal, power on delay circuit controls digital quantity
Output channel circuit delay is powered, and digital output channel circuit is made to reset the period without output, when the switching value of DCS system is defeated
Go out after the completion of module electrification reset, analog value is sent to digital output channel by CPU module by according to the output state before reset
On circuit, channel control loop just has electricity under delay circuit effect at this time, after resetting the switching value output module of DCS system
Output state value with reset before output state value it is identical.
2. switching value output module according to claim 1, it is characterised in that：The power on delay circuit is opened including first
Guan Guan（Q1）, second switch pipe（VT13）And several resistance, capacitance, the first switch pipe（Q1）Base stage and the 10th resistance
（R10）One end connection, the 10th resistance（R10）The other end respectively with the 19th resistance（R19）One end, the 19th capacitance（C19）
One end and reset signal connection, the 19th resistance（R19）The other end and power supply（VCC）Connection, the 19th capacitance（C19）
The other end ground connection, the first switch pipe（Q1）Emitter and power supply（VCC）Connection, the first switch pipe（Q1）
Collector respectively with second switch pipe（VT13）Base stage, the 9th resistance（R9）One end connection, the 9th resistance（R9）It is another
End ground connection, the second switch pipe（VT13）Base stage respectively with the 8th resistance（R8）One end, the 42nd capacitance（C42）Cathode
Connection, the 8th resistance（R8）The other end, the 42nd capacitance（C42）Anode and power supply（VCC）Connection, described second opens
Guan Guan（VT13）Emitter and power supply（VCC）Connection, second switch pipe（VT13）Collector lead to digital output
The power end connection of road circuit.
3. switching value output module according to claim 1, it is characterised in that：Between the CPU module and telecommunication circuit
Equipped with the first isolation circuit.
4. switching value output module according to claim 1, it is characterised in that：The CPU module is led to digital output
The second isolation circuit is equipped between road circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904735.1A CN105759678B (en) | 2015-12-09 | 2015-12-09 | The switching value output module of DCS system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904735.1A CN105759678B (en) | 2015-12-09 | 2015-12-09 | The switching value output module of DCS system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105759678A CN105759678A (en) | 2016-07-13 |
| CN105759678B true CN105759678B (en) | 2018-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510904735.1A Active CN105759678B (en) | 2015-12-09 | 2015-12-09 | The switching value output module of DCS system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376931B (en) * | 2018-04-13 | 2021-05-07 | 沈阳中科博微科技股份有限公司 | Functional safety current output module with high diagnosis coverage rate |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5837724A (en) * | 1981-08-28 | 1983-03-05 | Toshiba Corp | Reset circuit for microprocessor |
| DE3731207A1 (en) * | 1987-07-22 | 1989-03-30 | Honeywell Regelsysteme Gmbh | RESET CIRCUIT FOR MICROPROCESSORS AND COUNTERS |
| CN101764550A (en) * | 2009-11-10 | 2010-06-30 | 贵阳永青仪电科技有限公司 | Integrated protection controller for wireless intelligent motor |
| CN201976079U (en) * | 2011-03-23 | 2011-09-14 | 深圳创维－Rgb电子有限公司 | Resetting circuit and television comprising same |
| CN102761110B (en) * | 2011-04-26 | 2015-04-08 | 温州泓呈祥科技有限公司 | Power supply delay circuit |
| CN202276135U (en) * | 2011-10-24 | 2012-06-13 | 贵阳永青仪电科技有限公司 | Comprehensive protection controller for wireless intelligent motor |
| CN202421854U (en) * | 2011-12-22 | 2012-09-05 | 上海新华控制技术(集团)有限公司 | Triplex level redundancy switching value output module for DCS (data communication system) |
| CN203658808U (en) * | 2013-12-09 | 2014-06-18 | 南京国电环保科技有限公司 | Thermal power plant train sampling intelligence control system |
| CN104378093A (en) * | 2014-11-17 | 2015-02-25 | 锐迪科创微电子（北京）有限公司 | Power-on reset method and circuit using MIPI standard circuit |
| CN204576409U (en) * | 2015-03-26 | 2015-08-19 | 深圳市科陆电子科技股份有限公司 | Power-off restoration control circuit |
| CN205540077U (en) * | 2015-12-09 | 2016-08-31 | 重庆川仪自动化股份有限公司 | switch quantity output device |
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2015
- 2015-12-09 CN CN201510904735.1A patent/CN105759678B/en active Active
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