JPH0445318Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a control system, and more particularly, to a control system with expanded control capability in an emergency.

Prior Art Conventionally, a master station and a slave station are connected by a first optical transmission line that transmits commands from the master station to the slave station, and a second optical transmission line that transmits responses from the slave station to the master station. Combined control systems are known.

In such a control system, since the communication direction of the optical transmission line is determined, a light emitter is provided on the master station side of the first optical transmission line, and a light receiver is provided on the slave station side. Furthermore, a light receiver is provided on the master station side of the second optical transmission line, and a light emitter is provided on the slave station side.

Communication is performed using a serial data transmission method, and both the master station and slave station have a circuit for serial data communication.

Problems with the Prior Art In the control system as described above, if the serial data communication circuit on the slave station side breaks down, for example, it will not be possible to properly receive commands sent from the master station side. Additionally, responses cannot be returned normally.

Therefore, in such a case, instead of transmitting the command from the master station as serial data, the command is sent as a signal representing one of the two states of "0" or "1", and the command is sent directly from the master station to the slave station. One possibility is to control the on/off of the side equipment.

However, since the path for transmitting signals from the master station side to the slave station side is only the first optical transmission line, only one device on the slave station side can be controlled. There is a problem with being poor.

Purpose of the invention The purpose of the invention is to provide a control system that allows multiple slave-side devices to be controlled from the master station in an emergency when serial data communication between the master station and slave stations cannot be performed normally. There is a particular thing.

Structure of the invention In the control system of the invention, the light emitter of the master station and the light receiver of the slave station are coupled by a first optical transmission path, and the light receiver of the master station and the light emitter of the slave station are coupled to each other by a second light transmitter. In a control system that controls the operation of equipment belonging to the slave station, a slave station receives a command from an operation switch connected to a master station via a first optical transmission line, and a second An emergency light emitter is provided on the master station side of the optical transmission line, and an emergency light receiver is provided on the slave station side,
When a failure occurs in the communication function of the master station and/or slave station, the emergency light emitter emits initial light and the light is received by the emergency light receiver via the second optical transmission path. Switching to a control mode in which the operating status bypasses the master station and slave stations and is directly transmitted to the equipment via the first optical transmission line and the second optical transmission line, and emits light corresponding to the operating status of the operating switch. The feature of this configuration is that the equipment is directly controlled by parallel signals from the light source and the emergency light emitter.

Operation When the control system is functioning normally, the first optical transmission path becomes a one-way communication path that transmits commands from the master station side to the slave station side. Also the second
The optical transmission line is a one-way transmission line for transmitting responses from the slave station side to the master station side.

However, in the event of an emergency where a communication function failure occurs in the master station and/or slave station, an emergency light emitter on the master station side of the second optical transmission line and an emergency light receiver installed on the slave station side are used. By this, the first
The second optical transmission line serves as a transmission line for directly transmitting commands from the operation switch on the master station side to the equipment on the slave station side.

Therefore, commands from the master station side to the slave station side can use both the first optical transmission line and the second optical transmission line. This allows the operation switch on the master station to directly turn on and off at least two devices on the slave station.

Embodiments Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings. Here, FIG. 1 is a configuration block diagram of a control system according to an embodiment of the present invention, FIG. 2 a is a schematic external view of a photoelectric converter on the master station side of the control system shown in FIG. 1, and FIG. 2 b 2 is a schematic external view of a photoelectric converter on the slave station side of the control system shown in FIG. 1. FIG. Note that the present invention is not limited to the embodiments shown in the figures.

In the control system 1 shown in FIG. 1, a large number of operation switches S1 to Si are connected to a master station 2, and a large number of devices D, which are equipment, are connected to a slave station 3.
1 to DJ are connected. And master station 2
and the slave station 3 connect the first optical fiber 4 and the second
are coupled by an optical fiber 5.

When the master station 2 reads the on/off information of the operation switch S1, it creates serial data as a command to control the on/off of the device D1 on the slave station 3 side, and sends the changeover switch 14 via the solid line path in the diagram. drive the LED 6 and output it to the first optical fiber 4.

The slave station 3 reads the serial data on the first optical fiber 4 via the phototransistor 10, analyzes the command, and outputs it to the device D1 via the solid line side path of the changeover switch 15 in the diagram.
1 on/off control.

Similarly, the master station 2 reads the switch S2, converts the command into serial data, and sends it to the slave station 3. The slave station 3 receives the serial data, analyzes the command, and controls the device D2 on and off.

Furthermore, the master station 2 creates serial data representing commands for the operation switches S3 to Si based on their on/off states, and sends it to the slave station 3. The slave station 3 receives the serial data and issues commands. is analyzed and the devices D3 to Dj are controlled.

Each time the slave station 3 receives a command from the master station 2, it drives the LED 11 and returns a response signal.

The master station 2 receives the response signal sent through the second optical fiber 5 through a phototransistor 8.
to check whether communication is performed normally and commands are transmitted correctly.

The above is the normal operation of the control system 1,
Because commands are transmitted using serial data transmission method,
Although the master station 2 and slave station 3 are only coupled by a first optical fiber 4 and a second optical fiber 5, they can control a large number of devices D1 to Dj.

Next, the operation in an emergency will be explained.

The master station 2 checks the response from the slave station 3 to confirm whether the communication was carried out normally and whether the command was transmitted correctly. and,
For example, if a communication function failure occurs on the slave station 3 side, a correct response will not be received, so an abnormality on the slave station 3 side is detected. In this case, the master station 2 outputs the abnormality detection signal a to the OR gate 17.

Further, the monitoring circuit 18 monitors whether the operation related to the communication function of the master station 2 is normal or abnormal, and if any abnormality is detected, an abnormality signal b is sent to the OR gate 1.
Output to 7.

When the abnormal signal a or b is output, the OR gate 17 outputs an output to the one shot circuit 19, and the one shot circuit 19 outputs the pulse signal c.

When the pulse signal c is output, the OR gate 20
outputs the same signal as that pulse signal, and the emergency
Drive LED7.

When the emergency LED 7 is driven, the corresponding emergency
The LED 7 initially emits light, and the emergency phototransistor 12 provided on the slave station side of the second optical fiber 5 outputs a pulse signal d based on the received light.

The pulse signal d sets the flip-flop 21, and the set output causes the changeover switch 15 to be set.
and 16 are switched to the route on the dashed line side in the figure.

On the other hand, the flip-flop 22 is set by the pulse signal c of the one-shot circuit 19, and the selector switch 14 is thereby switched to the path on the broken line side in the figure.

Also, the set output of the flip-flop 22 causes the AND gates 23 and 24 to operate the operation switch S.
1. Let the on/off state of S2 pass through as it is. For example, turn on operation switch S1,
When "0" is output, the output of the AND gate 23 becomes "0", the output of the OR gate 20 also becomes "0", the emergency LED 7 is not driven, and the emergency phototransistor 12 outputs a "0" signal.
“0” is input to the device D1 via the changeover switch 15. Therefore, the electrical device D1 performs an operation corresponding to the input "0".

Next, when the operation switch S1 is turned off and "1" is output, the AND gate 23 outputs "1",
OR gate 20 outputs "1" and emergency LED
7 is driven, the phototransistor 12 outputs "1", "1" is input to the device D1 via the changeover switch 15, and the device D1 operates according to "1".

That is, even if a failure occurs in the communication function of the master station 2 or slave station 3, the device D1 can be directly turned on and off using the operation switch S1.

Similarly, the output of “0/1” by turning on/off the operation switch S2 is the “0/1” output of the AND gate 24.
1" output through the changeover switch 14.
The LED 6 is turned "off/on", the phototransistor 10 outputs "0/1", and the changeover switch 1
6 is input to the device D2, and the device D2 performs an operation according to “0” or “1”. That is, the device D2 can be turned on and off by the operation switch S2.

In this way, master station 2 and/or slave station 3
In the event of a communication failure, the emergency LED
7 to initially emit light and transfer it to the second optical fiber 5.
By receiving the light at the emergency phototransistor 12 through the light, the operating states of the operation switches S1 and S2 are changed via the first optical fiber 4 and the second optical fiber 5, bypassing the master station 2 and slave station 3. The control mode is switched to a control mode that is directly transmitted to the devices D1 and D2, and the operation switches S1 and S2
LED 6 and emergency LED 7 corresponding to the operating status of
The devices D1 and D2 are directly controlled by parallel signals from the.

FIG. 2a shows the photoelectric converter 9 on the master station side, where the LED 6 is provided corresponding to the first optical fiber 4, and the emergency LED 7 and phototransistor 8 are both provided on the second optical fiber 5. It is set up to correspond.

Further, FIG. 2b shows the photoelectric converter 13 on the slave station side, in which a phototransistor 10 is provided corresponding to the first optical fiber 4, and an LED
11 and an emergency phototransistor 12 are provided to correspond to the second optical fiber 5.

As can be understood from the above explanation, according to this control system 1, when an abnormality occurs in the communication function of the master station 2 or slave station 3, the master station side directly turns on the two devices on the slave station side. - Can be controlled off.

Effects of the invention According to the invention, the light emitter of the master station and the light receiver of the slave station are coupled by the first optical transmission path, and
The light receiver of the master station and the light emitter of the slave station are coupled through a second optical transmission line, and the slave station receives a command from the operation switch connected to the master station through the first optical transmission line. In a control system that controls the operation of equipment belonging to a slave station, an emergency light emitter is provided on the master station side of a second optical transmission line, an emergency light receiver is provided on the slave station side, and the master station and/or slave station When a communication function failure occurs, the emergency light emitter is activated initially and then the second
When the emergency light receiver receives light through the optical transmission line, the operation state of the operation switch is changed directly through the first optical transmission line and the second optical transmission line, bypassing the master station and slave stations. Provided is a control system characterized in that the control mode is switched to a control mode that is transmitted to the equipment at the same time, and the equipment is directly controlled by parallel signals from a light emitter and an emergency light emitter corresponding to the operating state of the operation switch. As a result, if a failure occurs in the communication function of the master station or slave station, it is possible to bypass the master station and slave station and directly control multiple devices on the slave station side using the operation switch on the master station side. become.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram of a control system according to an embodiment of the present invention, FIG. 2a is a schematic external view of a photoelectric converter on the master station side of the control system shown in FIG.
FIG. 2b is a schematic external view of a photoelectric converter on the slave station side of the control system shown in FIG. 1. Explanation of symbols, 1... Control system, 2... Master station, 3... Slave station, 4, 5... Optical fiber, 6, 11... LED, 7... Emergency LED, 8,
10...Phototransistor, 12...Emergency phototransistor, 9, 13...Photoelectric conversion section, 1
4, 15, 16...Selector switch, S1~Si...
Operation switch, D1~Dj...equipment.

Claims (1)

[Scope of claim for utility model registration] The light emitter of the master station and the receiver of the slave station are the first
The light receiver of the master station and the light emitter of the slave station are coupled by a second optical transmission line, and a command from an operation switch connected to the master station is transmitted to the first optical transmission line. In a control system in which a slave station receiving signals via a second optical transmission line controls the operation of equipment belonging to the slave station, an emergency light emitter is provided on the master station side of the second optical transmission line, and an emergency light receiver is provided on the slave station side. When a communication function failure occurs in the master station and/or slave station, the emergency light emitter is initially emitted and the light is received by the emergency light receiver via the second optical transmission path. The operation state of the operation switch is switched to a control mode in which the operation state of the operation switch is directly transmitted to the equipment via the first optical transmission line and the second optical transmission line, bypassing the master station and the slave station, and the operation state of the operation switch is changed to A control system characterized in that equipment is directly controlled by parallel signals from a corresponding light emitting device and an emergency light emitting device.