JPH01261712A - Monitor system for programmable controller - Google Patents

Abstract

PURPOSE:To prevent data from being lacked and to extremely reduce a delay time by providing a programmable controller with a signal sending means for a binary signal and providing a monitor device with a display means for the binary signal. CONSTITUTION:The programmable controller (PC) 1 reads out data by its CPU 2 and a parallel/serial converter 3 converts the data to a serial signal. A signal to be transmitted as a binary signal among the data read out from the CPU 2 through an output buffer 8. The monitor device 51 drives a LED in a display device 72 by using the binary signal inputted from the output buffer 8 to light up the LED. Thereby, the monitor device 51 inputs also the binary signal in parallel with a serial signal of the data outputted from the PC 1 and displays these signals at real time. Consequently, data to be conventionally lacked due to the rapid scanning time of the PC 1 can be completely monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring system for a programmable controller.

[Prior Art] Conventionally, in this type of monitor system, in order to know the progress of control, failures, etc., as shown in FIG. (hereinafter referred to as a P/S converter) 3, and after performing parallel-to-serial conversion by the P/S converter 3, the numerical data of the register and the coil ON state are sent to the monitor device 53 via the serial transmission line 4. , was sending off data. On the other hand, the monitor device 53
After converting serial data into parallel data using a serial/parallel converter (hereinafter referred to as an S/P converter) 6, and encoding and converting the format of the data using the CPU 12, the display unit 7. It was displayed on.

[Problems to be Solved by the Invention] In the conventional programmable controller monitor system described above, in order to ensure that communication is performed without error,
Data indicating the start of transmission, data indicating the length of transmission, parity data, data indicating the end of transmission, etc. must be added and sent, so information such as whether a certain coil is on or off is sent. Also, the actual VG
Although the amount of information is 1 bit, the data sent to the monitor ranges from a few bytes to several tens of bytes. Parallel/serial conversion takes time, and if the scanning time of the programmable controller 1 is fast, the data is sent to the monitor. Even if an attempt is made to do so, the previous data transmission has not yet been completed, and the current data cannot be transmitted, resulting in data loss.

[Means for Solving the Problems] In the programmable controller monitoring system of the present invention, the programmable controller sends human output data such as a coil to be processed and internal data (hereinafter referred to as control elements) as a binary signal. A monitor device inputs the binary signal and includes display means for displaying the state of the control element in real time.

[Function] If it is possible to send the status of the VJ control element of the programmable controller as a binary signal (1-bit signal), this signal is sent to the monitor device separately from the conventional serial signal. However, since the monitor device side reliably displays the data in real time using a display device (for example, LED, etc.) that is directly driven by this signal, there is no data loss and the delay time can be minimized.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a programmable controller monitor system of the present invention.

The programmable controller 1 reads data by its CPU 2, and the parallel/serial converter 3 converts this data from a parallel signal to a serial signal. Also, of the data read from the CPU 2, data that can be transmitted as a binary signal is sent out via the output buffer 8. The monitor device 5I converts the serial signal inputted from the programmable controller 1 via the serial transmission line 4 into a parallel signal by the S/P converter 6, processes the parallel signal by the CPU 12, and displays it on the display 7I. Perform the necessary display. In parallel with this, the display 7. Drive the LED to light up. Note that power is supplied to the LEDs of the display 72 from the programmable controller 1 via the power line IO.

Therefore, the quintuple monitor device inputs not only the serial signal of the data output from the programmable controller 1 during monitoring but also the binary signal in parallel and displays it in real time. It is possible to monitor all missing data.

FIG. 2 is a block diagram showing the configuration of another embodiment, except that the monitor device 52 is provided with an insulating device 11 on the input side of the display device 72 to insulate the input binary signal from the display device 72. , the configuration and operation are similar to those of the embodiment shown in FIG.

[Effects of the Invention] As explained above, the present invention utilizes the signal sending means for a binary signal provided in the programmable controller and the display means for this binary signal provided in the monitor device to control the inside of the programmable controller. By displaying the status of the element in real time on the monitor device, even if the scanning time is faster, the previous data transmission is not yet completed, and the display of the data held by the programmable controller and the monitor device This eliminates the difficult differences between the two, making it possible to monitor the operation of, for example, a coil that repeatedly turns on and off for each scan, which has the effect of preventing data loss.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the programmable controller monitor system of the present invention, FIG. 2 is a block diagram showing the configuration of another embodiment, and FIG. 3 is a conventional example of the programmable controller monitor system. FIG. 2 is a block diagram showing the configuration of FIG. 1...Programmable controller, 2.12-C
PU. 3...P/S converter, 4...serial transmission line, 5,. 52.53--Monitor device, 6--3/P converter, 71 + 72 ``'' indicator, 8--Output buffer, 9--Transmission line, l O---Power line, 11 ...Insulation device.

Claims (1)

[Scope of Claims] 1. In a programmable controller monitoring system in which serial data output from a programmable controller is displayed after being processed by a monitor device, the programmable controller indicates the status of its built-in control elements with a binary signal. A monitor system for a program controller, characterized in that the monitor device has a signal sending means for sending out a signal, and a monitor device has a display means for inputting the binary signal and displaying the state of the control element in real time.