JPS648960B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a remote monitoring and control device, especially its monitoring and control device.
Related to display devices.

As a test function of the remote monitoring and control device, there is a so-called inversion test in which all display signals from the controlled station are inverted and tested by an inversion test "on" operation on the control center side device. This reversal test is mainly performed to check lamp burnout and operation of the flicker calculation circuit, but during the execution of such a test, a state change (hereinafter also referred to as a state change) may occur in the monitoring equipment. In this case, it is necessary to immediately stop the test and notify the control center of this fact. However, since the control center has only one memory for displaying the status, when the actual input signal is received, the status of the signal inverted by the inversion operation and the actual status change are displayed. Since the state of the inverted signal matches, the state change is determined to be "No" for the item for which a state change was actually detected at the controlled station, and conversely, the state change is determined to be "Yes" for the item for which the state has not changed. I have to decide,
As a result, all display lamps except for the item whose status has changed will flicker. For this reason,
Conventionally, in order to find the item or device where a change in status occurred, the flicker was stopped by pressing the flicker stop button, and the status of the indicator lamp before the reversal test was recorded in advance, and the status and flicker were stopped. The drawback was that it required a complicated and time-consuming process to compare the state of each item one by one with the current state.

The present invention has been made under such circumstances, and provides a monitoring/display device that can easily and quickly detect changes in the status of monitored items without requiring the above-mentioned complicated and time-consuming operations. The purpose is to

Its feature is that it is equipped with a storage device that stores the state of the monitoring point before the start of the reversal test, and when a change in state is detected at the controlled station during the reversal test, normal state change detection is performed as a condition. Instead of invalidating it, the contents of the storage device are compared with the status of the monitoring point, and the display lamp is flickered only when a change in status is detected.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of this invention.
FIG. 2 is a time chart for explaining the operation of FIG. 1.

In FIG. 1, 1 is a controlled station consisting of an input circuit 11 and an inversion test control circuit 12, and 2 is a control station consisting of an input memory 21, holding memories 22, 23, a state change detection circuit 24, a flicker calculation circuit 25, etc. be. In addition, AN3 is an AND gate, SW1
is the reversal test "on" switch, SW2 is the reversal test "off" switch, SW3 is the flicker stop switch,
In addition, EX1 and EX2 in the state change detection circuit 24 are exclusive OR circuits, AN1 and AN2 are AND gates,
T is an input terminal for an inverted test signal.

Normally, external signals from a plurality of devices, devices, etc. are received and stored in the input memory 21 of the control center 2 via the controlled center 1 . The holding memory 22 holds the previous state of the input memory 21. Therefore, when a change in state occurs in an external device, etc., it is detected by the exclusive OR circuit EX1 in the state change detection circuit 24, and the AND The signal is applied to the flicker calculation circuit 25 via the gate AN1. Fritzka calculation circuit 25
calculates the flicker cycle etc. for display, selects the lamp corresponding to the device etc. in which the condition has changed, and displays the flicker.

At this point, turn on the reversal test to perform the reversal test.
When the switch SW1 is turned on, the reversal test command signal is transmitted to the controlled station 1 and the reversal test control circuit 1
2 works. As a result, the state of the external input applied via the input circuit 11 is inverted and applied to the input memory 21 of the control center 2 via the transmission path. At this time, the state immediately before entering the inversion test state is held in the holding memory 22, and the contents are transferred to the holding memory 22 via the AND gate AN3 at the same time that the inversion test "on" switch SW1 is turned on.
3, the state immediately before the start of the reversal test is stored in the holding memory 23. When the inverted information is input to the input memory 21, the state of the memory 21 and the state of the holding memory 22 are compared in the state change detection circuit 24, and if a mismatch is detected, that is, a change in state is detected, the flicker calculation circuit 25 An output L is generated to cause the indicator lamp to flicker. Thereafter, the contents of the memory 21 are transferred to the holding memory 22.
Therefore, the holding memory 22 always holds the state of the input memory 21 immediately before being updated. Note that if the flicker stop switch SW3 is turned on while the display lamp is flickering, the flickering will stop.

Here, the operation will be explained with reference also to FIG.

Now, when the reversal test "on" switch SW1 is turned on at time t _p as shown in Fig. 2A to perform the reversal test, this signal is transmitted to the controlled station 1, so
The controlled station 1 returns a response signal to the signal as shown in FIG. 2D. Note that this response signal is sent to the control center 2.
Since the signal is sent back asynchronously with the response signal, the control station 2 turns on the inversion test signal as shown in Figure 2 E after a predetermined delay time (time t _d corresponding to one display cycle) from the response signal. and is applied to the state change detection circuit 24 via the terminal T. On the other hand, the switch
When SW1 is turned on, if the states of external equipment or devices A and B are "0" and "0", respectively, as shown in FIG. being second
As shown in FIGS. F and G, the signals become "1" and "1" and are sent to the input memory 21 and stored. At this time, the holding memory 22 is the input memory 2 immediately before starting the inversion test.
1, that is, the states "0" and "0" of the input devices or devices A and B, the exclusive OR circuit EX1 of the state change detection circuit 24 is established. At this point, the inversion test signal is not turned on as shown in Fig. 2 (E), so the AND gate AN1 is established, and the response is applied to external equipment or devices A and B via the flicker calculation circuit 25. The display lamp flickers as shown in Figure 2. In FIG. 2, ``chi'' and ``ri'' respectively indicate the contents of the memory 22 after a change in the state of external equipment or devices A and B has been detected, that is, the contents of the memory 22 immediately after being updated by the input memory 21. be. Similarly, null indicates the contents of the memory 22, that is, the contents of the memory 23, which are transferred at the same time as the switch SW1 is pressed.

In this way, the reversal test signal is turned on, and at time _t1 during the reversal test, if a state change as shown in FIG. The occurrence of a state change in any external device or device B is detected by the state change detecting means. As a result, in the controlled station 1, the reversal test control circuit 12 is disabled and the reversal test is stopped, and in order to also cancel the reversal test at the control station 2, the response signal shown in FIG. is transmitted to the control center 2. The state change detection means in the controlled station 1 is provided simply to detect a change in the state of the external equipment or device B and to stop the reversal test, and is used in the device configured to perform the reversal test. is normally installed. Therefore,
The state change detection means in the controlled station 1 is completely unrelated to the state change detection circuit 24 which is capable of detecting items of state change in the control station 2. In the control station 2, after confirming the response signal "0" and after a predetermined delay time _td , the inversion test signal is set to "0" as shown in FIG. Since the inversion test is canceled, the status signal from the external device is sent to the input memory 21 without being inverted, but at this time, the holding memory 22 retains the state during the inversion test, so the status signal from the external device is sent to the input memory 21 without being inverted. When the contents of the memory 22 and the contents of the input memory 21 are compared, the display of the equipment or device in which the condition has actually changed does not flicker, but only the display of the device without the change in condition flickers, which is inconvenient. . Therefore, in the present invention, by using the delayed inversion test signal, the state change detection by the input memory 21 and the holding memory 22 is disabled, and instead, the memory 23, which holds the contents immediately before the start of the inversion test, is used. and input memory 2
By comparing the contents with 1 in the exclusive OR circuit EX2, the device or device in which the state has actually changed is detected, and the flicker calculation circuit 25 flickers the corresponding lamp. That is, in this case, as shown in FIG. 2B, no change has occurred in external device A, so the contents of memories 21 and
Since they match as "0" as shown in Figures F and N, there is no flicker display as shown in Figure 2 O, whereas a change occurs in the external device B and as shown in Figure 2 T and R. 1”, “0”, so a mismatch is detected,
It will flicker as shown in Figure 2. In addition,
As described above, the flicker is stopped by operating the flicker stop switch SW3 as shown in FIG. 2(f).

As described above, according to the present invention, only the display corresponding to the external device or device in which a state change occurred during the reversal test is flickered, so that it is possible to easily and quickly check the display that corresponds to the external device or device in which a state change has occurred during the reversal test. To,
Moreover, it has the advantage of being able to be found accurately.

The present invention can be applied not only to the above-mentioned remote monitoring and control device, but also to a display monitoring panel for monitoring and displaying equipment, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of this invention.
FIG. 2 is a time chart for explaining the operation. Description of symbols 1... Controlled station, 11... Input circuit, 12... Inversion test control circuit, 2... Control station,
21...Input memory, 22, 23...Holding memory, 24...State change detection circuit, 25...Flicker operation circuit, EX1, EX2...Exclusive OR circuit, AN1 to AN3...And gate, T... ...Signal input terminal during reversal test.

Claims (1)

[Claims] 1 A device that receives and temporarily stores information from a controlled facility that monitors the status of multiple devices or equipment (hereinafter referred to as equipment, etc.) and inverts and transmits the status information when an inverted test signal is received. 1 storage means, a second storage means for storing the previous value of the first storage means until it is updated with the current new information, and the second storage means when the inverted test signal is received; a third storage means for reading and retaining the contents of the means; a first comparison means for comparing the contents of the first and second storage means; and a second comparison means for comparing the contents of the first and third storage means. a display means for flickeringly displaying the status of each of the devices, etc. based on the output of each of the comparison means; and a display device for discontinuing the inversion test at least when a state change actually occurs in the device, etc. during the inversion test. Additionally, control means is provided for disabling the output of the first comparison means for a predetermined period of time and monitoring and displaying the output through the second comparison means and the display means, so that a state change actually occurs during the reversal test. A monitoring/display device characterized by flickering only a display means corresponding to a device, etc. to facilitate identification.