JPH0644726B2 - Supervisory control system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a supervisory control system, and more particularly to a supervisory control system such as a CATV (cable television) system.

Since the relay amplifier with status monitor in the CATV system is installed over a wide area geographically, each relay amplifier is concentrated at the center from the viewpoint of reducing the influence on the entire CATV system such as early detection of failure occurrence of the relay amplifier and preventive maintenance. It is indispensable to monitor, and the pilot output level of the downstream trunk line of each relay amplifier, the pilot output level of the upstream trunk line, the AC input voltage, the DC output voltage / current, the temperature inside the housing, The open / closed state of the housing, the open / closed state of the bridger switch, and the open / close control are monitored.

However, since this relay amplifier is normally operated for 24 hours outdoors in bad environmental conditions such as exposure to wind and rain, malfunction occurs due to the occurrence of water immersion inside the housing of the relay amplifier,
Although there is a case where the function is stopped, the conventional relay amplifier with a status monitor has a drawback in that it does not have a function of monitoring the state of water ingress into the housing.

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional ones, and to provide a monitoring and control system capable of monitoring the occurrence of water ingress into a housing and detecting it early. With the goal.

Configuration of the Invention A supervisory control system according to the present invention is a supervisory control system including a center station and a plurality of relay amplifiers housed in mutually different housings and transmitting and receiving to and from the center station. A humidity sensor for detecting the humidity inside the housing, a comparing means for quantizing the detected value of the humidity sensor and comparing it with a preset humidity value, and the humidity inside the housing exceeds the humidity value by this comparison result. Means for sending alarm information to the center station in response to the fact that it is indicated that each of the plurality of relay amplifiers is provided.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a humidity information monitoring unit in a relay amplifier in a supervisory control system according to an embodiment of the present invention. In the figure, this humidity information monitoring unit drives the humidity sensor 1 for detecting the humidity inside the housing and the humidity sensor 1,
A detection circuit 2 which sends out a DC voltage compared with the humidity detected by the humidity sensor 1 as an output signal, a status monitor CPU (central processing unit) 3 which takes in status information 4,
The demodulator 6 includes a modulator 5 that transmits and receives data to and from a center (not shown).

Since the temperature inside the relay amplifier is usually higher than the outside, the humidity is lower than the outside. Further, since the case is hermetically sealed, the humidity is maintained at a constant value. However, when water is flooded into the housing due to insufficient closure of the housing lid, the flooded water evaporates, causing an abnormal increase in humidity inside the housing.

When the humidity sensor 1 detects this abnormal increase in humidity inside the housing, the humidity sensor 1 sends the detected humidity to the detection circuit 2. The detection circuit 2 sends a DC voltage proportional to this humidity to the status monitor CPU 3 as an output signal. In the status monitor CPU3, this DC voltage is
/ D (analog / digital) conversion is performed, and the digitally converted humidity is compared with a humidity tolerance value preset in the status monitor CPU 3 in advance. When the comparison result shows that the humidity is equal to or more than the allowable humidity value, the status monitor CPU 3 detects the humidity abnormality, flags the alarm information, and sends the humidity abnormality alarm information to the center through the modulator 5. This alarm information flag is the status monitor CP
It is held until U3 is reset.

FIG. 2 is a block diagram of a supervisory control system according to an embodiment of the present invention. In the figure, 7 is a relay amplifier with a status monitor including a humidity information monitoring unit, and an address is set in each relay amplifier 7. 8 is the head end,
Reference numeral 9 is a supervisory control device including a communication control part. Polling by assigning an address from the supervisory controller 9 is sequentially performed to each relay amplifier 7. The relay amplifier 7 having the address matching the address part in the polling data returns the alarm information from the internal status monitor CPU.

In this way, by adding the small and light humidity sensor 1 and the detection circuit 2 inside the conventional relay amplifier 7 with a status monitor, it becomes possible to centrally monitor the occurrence of water ingress to the relay amplifier 7 by the sensor, which causes a failure. It is possible to detect the relay amplifier 7 that has caused the error at an early stage, and thus it is possible to take fault prevention measures by the mote monitoring.

Although the relay amplifier with the status monitor in the CATV system has been described in the embodiment of the present invention, the present invention may be applied to a system including a relay amplifier such as a telephone line, and is not limited to the CATV system.

As described above, according to the present invention, when the humidity inside the housing indicates a predetermined value or more, the alarm information is transmitted to monitor the occurrence of water ingress into the housing. There is an effect that it is possible to provide a supervisory control system that can detect this at an early stage.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a humidity information monitoring unit in a relay amplifier in a supervisory control system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a supervisory control system according to an embodiment of the present invention. Is. Explanation of symbols of main parts 1 ... Humidity sensor 2 ... Detection circuit 3 ... Status monitor CPU

Claims (1)

[Claims] 1. A monitor and control system comprising a center station and a plurality of relay amplifiers housed in different housings and transmitting and receiving to and from the center station, wherein the humidity inside the housing is A humidity sensor for detecting the humidity, a comparing means for quantizing the detection value of the humidity sensor and comparing the humidity value with a preset humidity value, and the comparison result shows that the humidity inside the casing exceeds the humidity value. And a means for transmitting alarm information to the center station in response to the notification, provided to each of the plurality of relay amplifiers.