JPH054379Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a terminal unit for a food plant.

[Prior Art] The present applicant has proposed a communication control system for a fluid control valve as shown in FIG.
No. 185431, reference).

In FIG. 2, 1 is an external control device, 2 is a central unit, 3 is a terminal unit, and 4 is a fluid control valve, which is installed near the fluid control valve 4 in the central unit 2 via an optical fiber line 5. A plurality of terminal units 3 are connected in a loop.

The central unit 2 includes a data transmitting means for converting control information including control commands and terminal addresses based on the control output from the external control device 1 into serial optical signals and repeatedly transmitting the serial optical signals to the optical fiber line 5, and a final terminal. It has data receiving means for receiving the optical signal from the unit 3, decoding and outputting information indicating the operating state of the terminal equipment contained in the received data.

On the other hand, each of the terminal units 3 receives the optical signal obtained through the optical fiber line 5, converts it into received light data, and serially converts the received light data in synchronization with the detection of the end of reception of the received data. A data transmitting/receiving means converts the data into an optical signal and outputs it to the optical fiber line 5 at the subsequent stage, and when the own address is determined from the received light data, a control signal corresponding to the control command bit of the received light data is sent to the fluid control valve 4. an address discriminating means to output, and a data change in which, when the address discriminating means discriminates the own address, the control command bit of the received light data is changed to information on the terminal operating state by the fluid control valve 4, and the data is transmitted by the transmitting/receiving means. has the means and.

Therefore, when this system determines its own address, it controls the fluid control valve 4 according to the control command bit of the received data, and at the same time controls the operating state of the terminal equipment using the communication data.
I am trying to display it in

[Problem that the invention aims to solve] In such a communication control system, internal
It is necessary to check the test status of the ROM and RAM when turning on the power, the connection status of the optical cable, the operating status of the solenoid valve, and the status of the limit switch that detects the opening and closing of the valve. It is necessary to set the address and transmission output to the next stage.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a terminal unit incorporating a power lamp, a bulb operating lamp, a limit switch operating lamp, a manual switch, and a setting switch.

[Means for Solving the Problems] In order to achieve the above object, the present invention inputs a control signal sent from a central unit and opens/closes the valve according to the control signal when the control signal matches the own address. Inside the terminal unit, which controls the valve status into a control signal and sends it to the central unit, there are power lamps and solenoid valves that display the internal RAM and ROM test status and optical fiber connection status when the power is turned on. Built-in valve operating lamp to display the excitation status of the light limit switch, limit switch operating lamp to indicate the optical limit switch status, manual switch to manually operate the solenoid valve, and setting switch to set the self address and transmission output to the next stage. It is something.

[Function] In the present invention, a power lamp, a valve operation lamp, a limit switch operation lamp, a manual switch, and a setting switch are built into the terminal unit, so that the following functions can be achieved.

The power lamp lights up to indicate normal operation, and blinks to indicate errors in the internal ROM or RAM or an inability to receive optical signals.

The valve operation lamp can be lit to indicate the energized state of the solenoid valve.

The status of the limit switch can be displayed by turning it on or off depending on the limit switch.

When turned on, the manual switch energizes the solenoid valve, allowing the valve to be fully open or fully closed.

A setting switch can be used to set the own address and the transmission output to the next stage.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

First, to explain the configuration, in Figure 1, 1
1 is a terminal unit used in a food plant, and the terminal unit 11 receives an optical signal obtained through an optical fiber line, converts it into received light data, and converts the received light in synchronization with the detection of the end of reception of the received data. A data transmitting/receiving means serially converts data into an optical signal and outputs it to a subsequent optical fiber line, and when the self address is determined from the received light data, a control signal corresponding to the control command bit of the received light data is address discriminating means for outputting to the control valve; and when the address discriminating means discriminates its own address, the control command bit of the received light data is changed to information on the terminal operating state by the fluid control valve, and the information is transmitted by the transmitting/receiving means. data changing means, and is constructed as shown in FIG. 3 of Japanese Patent Application Laid-open No. 185431/1983.

Further, a printed circuit board 13 is housed inside the terminal unit 11, and the printed circuit board 13 includes power terminals 14, 15, a power lamp 16, a valve operation lamp 17, a receiving optical connector 18, and a manual switch 1.
9, a limit operation switching pin 20, a limit switch operation lamp 21, a transmission optical connector 22, a setting switch 23, an optical limit switch 27, etc. are provided. Further, a solenoid valve 25 is provided on the support plate 24. Note that 26 is a waterproof cable clamp.

The power lamp 16 lights up during normal operation, and blinks when there is an error caused by a test when the internal ROM or RAM is turned on, or when the optical fiber is disconnected and cannot receive an optical signal.

The valve operation lamp 17 lights up when the solenoid valve 25 is energized, and goes out when it is not energized.

The limit switch operation switching pin 20 sets whether the optical limit switch 27 is on or off when light is blocked.

The limit switch actuating lamp 21 is turned on when light is blocked, and is turned off when light is not blocked, or is turned off when light is blocked, and is turned on when light is not blocked.

The manual switch 19 is used to manually turn on the solenoid valve 25. When the lever 28 is pushed toward the printed circuit board, it is turned on and the valve operation lamp 17 lights up. Normally, the lever 28 is turned off by tilting it toward the solenoid valve side.

The setting switch 23 uses switches 1 to 6 to set its own address, and uses switch 8 to set the transmission output to the next stage. Switch 7 is not used.

In this way, the power lamp 16, valve operation lamp, and limit switch operation lamp 21 display the test status of the internal ROM and RAM when the power is turned on, the connection status of the optical fiber, the excitation status of the solenoid valve 25, and the status of the optical limit switch 27. In addition, the solenoid valve 25 can be operated by the manual switch 19, and the setting switch 23 can be used to set the self-address and the transmission output to the next stage.

[Effects of the invention] As explained above, according to the invention, a power lamp, a valve operation lamp, a limit switch operation lamp, a manual switch, and a setting switch are built into the terminal unit, making it possible to test the internal RAM and ROM. It can display the status, optical fiber connection status, solenoid valve excitation status, and optical limit switch status, and can also manually operate the solenoid valve, and can also display its own address and the next stage. Transmission power can be set.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. In the figure, 11...terminal unit, 13...printed circuit board, 14, 15...power terminal, 16...power lamp, 17...bulb operation lamp, 18...
Reception optical connector, 19...Manual switch, 20
... Limit operation switching pin, 21 ... Limit switch operation lamp, 22 ... Optical connector for transmission,
23...Setting switch, 24...Support plate,
25...Solenoid valve, 26...Waterproof cable lamp, 27...Optical limit switch.

Claims (1)

[Scope of utility model registration request] A terminal unit that inputs a control signal sent from the central unit, controls the opening and closing of the valve according to the control signal when it matches its own address, and also replaces the valve status with a control signal and sends it to the central unit. Inside, there is a power lamp that displays the internal RAM and ROM test status and optical fiber connection status when the power is turned on.
Valve operation lamp that displays the excitation state of the solenoid valve,
A terminal unit for a food plant characterized by having a built-in limit switch operating lamp that indicates the status of an optical limit switch, a manual switch that manually operates a solenoid valve, and a setting switch that sets its own address and transmission output to the next stage. .