JPH0344196A - Data transmitter - Google Patents

Abstract

PURPOSE:To allow a data transmitter to cope with various load flexibly by mounting an input output circuit for a remote station as a removable auxiliary printed circuit board section. CONSTITUTION:A power supply circuit 36 is arranged on a main printed circuit board 37 being a main circuit while being electrically isolated from a control circuit 33. On the other hand, input output circuits 34, 35 are arranged on an auxiliary printed circuit board 38 being an auxiliary circuit board. The printed circuit boards 37, 38 are mounted removably in a rectangular case 39 and in the connecting state while being mounted. In this case, various kinds of auxiliary printed circuit boards 38 are prepared depending on the input condition of a local control panel connecting to an input circuit 29 or an output condition of a load connecting to an output circuit 30, and a suitable auxiliary printed circuit board 38 is selected depending on the condition and mounted. Thus, the transmitter copes flexibly with various input and output conditions with a low cost.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides control by giving data from a master station to a plurality of remote stations provided for controlling electrical equipment belonging to the same. The present invention relates to a data transmission device configured to perform.

(Prior Art) In this type of data transmission device, a master station and a plurality of remote stations are generally connected via a transfer path, and the master station transfers address data stored in a data memory for transmission to a starting address. Repeats sequential output from to the final address. Address data specifies the stations that are talkers and listeners. According to this address data, the station designated as the talker outputs the current data to the transmission path, and the station designated as the listener outputs the current data to the transmission path. Manually process the data. By repeating such data exchange, data is transmitted between the master station and numerous remote stations. In this case, each remote station controls its own electrical equipment in accordance with manually inputted data, and outputs data indicating the status of the electrical equipment to the transmission line.

This type of data transmission device is used to control electric equipment such as several distributed induction motors, and a remote station centrally operates and monitors these multiple induction motors. It is housed in the center unit and also in the on-site production board placed near each induction motor. The master station housed in the central control unit controls the operation of each induction motor, as well as monitors and protects them, by transmitting data to and from each remote station via a transmission line. . In this case, the remote station consists of circuit parts such as a power supply circuit, a control circuit that processes transmitted and received data, a manual circuit that receives external input signals from the load, and an output circuit that outputs drive signals to drive the load. Since the circuit section is generally specialized depending on the object to be controlled, the circuit section is integrated into the device and is arranged and formed on a single printed circuit board.

(Problem to be solved by the invention) However, in the configuration as described above, when the controlled object changes and the human power conditions of the external input signal or the output conditions of the drive signal change, the circuit section of the remote station ,
Each time, it was necessary to create a new one with a new circuit configuration. That is, for example, human power conditions include contact human power, analog human power, DC human power, etc., and output conditions include relay output, analog output, triac output, etc.
Even if the functions of the remote stations are the same,
There is a problem in that the configuration of input circuits or output circuits becomes complicated depending on the input/output conditions, and as a whole cannot be standardized, resulting in an increase in cost.

Furthermore, since the circuit portion is integrally arranged and formed, there is a problem in that the control circuit driven at a low voltage is easily affected by malfunctions and other adverse effects due to noise from the power supply circuit.

The present invention has been made in view of the above circumstances, and its purpose is to flexibly respond to changes in the input/output conditions of a controlled object at a remote station at a low cost, and to provide a power supply circuit for controlling a control circuit. The purpose of the present invention is to provide a highly reliable data transmission device that prevents the adverse effects of noise, etc.

[Structure of the Invention] (Means for Solving Problems) The present invention provides a master station for data transmission, and a system that controls electrical equipment belonging to itself based on data provided from the master station via a transmission path. The target is a data transmission device consisting of a plurality of remote stations that are equipped to perform external input signals and to receive external input signals, and each of the plurality of remote stations can be controlled to control the electric equipment based on the transmitted data and to control the external input signal. A main circuit board portion having a control circuit for processing input signals, and an auxiliary circuit having an input/output circuit for transmitting and receiving the control output signal and external input signals and provided detachably to the main circuit board portion. The feature is that it is composed of a substrate part.

Further, it is preferable to arrange and form the main circuit board section in a state where the power supply circuit for power feeding and the control circuit are electrically separated.

(Function) According to the data transmission device of the present invention, even if the input/output conditions from the electrical equipment to be controlled to the remote station change, the auxiliary circuit board portion on which the input/output circuit matching the conditions is formed The main circuit board can be fixed by simply replacing it, and the main circuit board can be fixedly provided as a common part without any new configuration. Therefore, it is possible to adjust various input/output conditions at low cost without having to create the whole thing from scratch. can respond flexibly.

In addition, if the main circuit board is arranged so that the power supply circuit and control circuit are electrically separated, noise from the power supply circuit to the control circuit is reduced, preventing adverse effects such as malfunction, and increasing reliability. Improves sex.

(Example) Hereinafter, an example in which the present invention is applied to a system for controlling a plurality of induction motors will be described with reference to the drawings.

First, in FIG. 3 showing the overall block configuration, a plurality of control center remote stations 2 and a plurality of field operation panel remote stations 3 are connected to a master station 1 via a transmission line 4. The master station 1 includes a programmable controller 6 that controls the entire system via the system controller.
(hereinafter abbreviated as PC). The control center 7 is composed of a plurality of units 8 formed in multiple stages, and each of these units 8 is connected to a remote station 2. It is composed of a multifunctional protection relay 9 and an electromagnetic contactor 10. The multifunctional protection relay 9 opens and closes the electromagnetic contactor 10 provided in the main circuit 12 for the induction motor 11 that belongs to itself among the plurality of distributed electrical devices, ie, the induction motor 11. It starts and stops the induction motor 11, and outputs a status signal indicating the operating status of the induction motor 11 to the remote station 2. The on-site operation panel remote station 3 is installed near each of the plurality of induction motors 11, and outputs operation signals for starting and stopping the induction motors 11 as data to a transmission line 4, and transmits them via the transmission line 4. According to the supplied data, a drive signal is output to the outside to turn off the power to a load such as a display lamp (not shown).

FIG. 4 shows the electrical configuration of the master station 1. The CPU 13 that processes data in the master station 1 is composed of, for example, a one-chip microcomputer, and the memory 14 stores operating programs and fixed data.
It is connected to a serial data transmission section 16 connected to the transmission line 4 via a pulse transformer 15, and a control circuit 17 is configured by these components. Further, the CPU 13 is connected to a dual port memory 18 as a transmission data memory connected to the system bus 5, and is thereby provided with address data as well as to the programmable controller 6.
Control data is given from Address data specifies stations that will be talkers and listeners.
Each address data from the first address to the last address of the dual port memory 18 is sequentially outputted and data is transmitted between stations, and this process is repeated. When the serial data transmission unit 17 receives data from the CPU 14, it outputs the data as a serial signal to the transmission path 4 via the pulse transformer 18. On the other hand, when data is provided via the transmission +t84, it outputs the data as a parallel signal to the CPU 14.
Output to.

Figure 5 shows remote station 2 for control center.
The CPU 19 that processes data in the remote station 2 has a serial data transmission unit 22 connected to the transmission line 4 via a memory 20 and a pulse transformer 21, as in the master station 1. These components constitute a control circuit 23. Further, the CPU 19 is connected to a handshake circuit 24 as an input/output circuit, and this handshake circuit 24
When a control signal is given to the multi-mode protection relay 9 via the In addition to controlling the opening and closing of the contactor IO, currents from the current converter 25 and zero-phase current transformer 26 disposed between the main circuit 12 and the induction motor 11 are detected and sent as a status signal to the handshake circuit 24. In addition, the multifunctional protection relay 9 protects the induction motor 11 from overload and overload according to the main circuit current detected by the current converter 25, The induction motor 11 is protected from a ground fault according to the zero-phase current of the circuit 12. Furthermore, the electromagnetic contactor 10
A molded circuit breaker 28 is disposed between the three-phase AC power line 27 and the three-phase AC power line 27 (not shown in FIG. 3).

Now, Figure 1 shows the mortar stainless steel 3 used for work on site.
The CPU 29 that processes data in the remote station 3 has a serial data transmission section 32 connected to the transmission line 4 via the memory 30 and the pulse transformer 31, as in the master station 1. These components constitute a control circuit 33. Further, the CPU 29 is connected to an input circuit 34 and an output circuit 35 which are input/output circuits, and a control signal from a field operation panel (not shown) is input manually via the input circuit, and a control signal (not shown) is inputted via the output circuit 35. Outputs the load drive signal. The power supply circuit 36 supplies the low voltage and high voltage power necessary for each circuit in the remote station 3, and is supplied with power from an external AC power supply.The power supply port 7836 and the control circuit 33 are electrically connected to each other. They are arranged and formed on a main circuit printed circuit board 37 which is a main circuit cutting board part in a separated state,
On the other hand, the input/output circuits 34 and 35 are arranged and formed on an auxiliary circuit printed circuit board 38 which is an auxiliary circuit board part. These printed bases tli237.38 are removably attached to the rectangular case 39, as shown in FIG.
When installed, it is in the connection state described above. in this case,
Manual operation of field control panel to 2 input circuits or 3 output circuits
Various types of auxiliary circuit printed circuit boards 38 are provided depending on the output conditions to the load connected to 0, and the corresponding auxiliary circuit printed circuit board 38 is selected and installed according to the conditions at that time. It looks like this.

According to such a configuration, the master station 1 . remote station 2
Data transmission is performed between and 3 via the transmission path 4,
Each of the remote stations 2 and 3 controls the induction motor 11 belonging to itself according to the given data, and transmits a status signal indicating its operating status as data as necessary. Thereby, the master station 1 can control the operation of the plurality of induction motors 11 and monitor and protect the overall operating state.

In addition, in this case, the induction motor 1 to be controlled
If the input/output conditions differ due to a single model or its control means, the auxiliary circuit printed circuit board 38 in the field operation panel remote station 3 is connected to the input/output circuit 3.
The main circuit printed circuit board 37 can be left as it is, so it is possible to respond flexibly to various input/output conditions at low cost.

Further, since the main circuit printed circuit board 37 in the remote station 3 has the power supply circuit 36 and the control circuit 33 separated from each other, the control circuit 33 is connected to the power supply circuit 33.
6 is reduced, malfunctions are prevented, and reliability and reliability are improved.

In the above embodiment, the case where there are six remote stations is shown, but it is needless to say that the present invention is not limited to this.

Further, in the above embodiment, an example was described in which the present invention is applied to the remote station 3 for a field operation panel, but the present invention is not limited to this, and can also be applied to the remote station 2 for a control center. Various modifications are possible without departing from the spirit of the present invention, such as application to input/output circuits of remote stations of other systems.

[Effects of the Invention] According to the data transmission device according to claim 1, the input/output circuit of the remote station is detachable. 1 (i) Since it is installed as an auxiliary circuit board part, even if the control target is different, select and install the auxiliary circuit board part equipped with the input/output circuit corresponding to the input/output conditions of the control target. Therefore, unlike conventional products, there is no need to newly design and manufacture control circuits and power supply circuits that have common functions, and it is possible to respond flexibly to various loads without increasing costs. It has excellent effects.

According to the data transmission device according to the second aspect, since the control circuit and the power supply circuit of the main circuit board portion are arranged and formed in a separated state, the control circuit is less affected by noises etc. from the power supply circuit. This has the excellent effect of preventing malfunctions and improving reliability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an electrical configuration diagram of a remote station for a field operation panel, FIG. 2 is an external perspective view of the same, FIG. 3 is a block diagram of the overall configuration, and FIG. FIG. 5 is an electrical configuration diagram of the master station, and FIG. 5 is an electrical configuration diagram of the remote station for the control center. In the drawing, 1 is a master station, 2 is a remote station for the control center, 3 is a remote station for the field operation panel, 4 is a transmission line, 5 is a system bus, 6
is a programmable controller, 7 is a control center, 8 is a unit, 9 is a multi-functional ridge type protective relay, 10 is an electromagnetic contactor, 11 is an induction motor (electrical equipment), 13.19
and 29 are CPUs, 16, 22 and 32 are serial data transmission units, 17, 23 and 33 are control circuits, 18 is a dual port memory, 34 and 35 are input circuits and output circuits (
36 is a power supply circuit, 37 is a main circuit printed board (main circuit board part), 38 is an auxiliary circuit printed board (
Auxiliary circuit board section) 37 is a case.

Claims (1)

[Claims] 1. A master station for data transmission, and a plurality of remote stations that control their own electrical equipment based on data provided from the master station via a transmission line and are also equipped to accept external input signals. In the data transmission device, each of the plurality of remote stations includes a main circuit board section having a control circuit that controls the electrical equipment based on the transmitted data and processes the external input signal; 1. A data transmission device comprising: an auxiliary circuit board section that has an input/output circuit for transmitting and receiving control output signals and external input signals, and is detachably attached to the main circuit board section. 2. The data transmission device according to claim 1, wherein the main circuit board section is arranged such that the power supply circuit for power feeding is electrically separated from the control circuit.