JPH06318968A - Double monitor system for polling - Google Patents

Abstract

PURPOSE:To enable a newly added monitor device to surely select and receive data without overlapping data from another slave device with respect to the double monitor system for polling where double monitor is performed by a monitor controller, which monitors polling on the master side, and the monitor device newly added in parallel. CONSTITUTION:The response data reception part of a newly added monitor device 30 does not have the conventional wired OR constitution but is provided with a detector 31, which branches and receives request data transmitted from a master device 10 to plural slave devices 21 to 2n to detect a desired slave device number on its format, and a selector 32 which is controlled by this detection signal and selects and fetches response data R1 from the arbitrary desired slave device 21 out of response data R1 to Rn from slave devices 21 to 2n.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a parent device of an in-station device transmits a sequence of request data for simultaneous control to a plurality of child devices of communication partners, and each child device receives the request data. It relates to a polling method for requesting transmission of response data of each device, in particular, request data to be transmitted from the parent device to the child devices at the same time and response data to be individually transmitted from each child device to the parent device. Monitoring monitoring device and a dual monitoring system for polling received and monitored by a newly added monitoring device in parallel therewith.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a conventional polling dual monitoring system. Request data S requesting that the parent device 10 receive control data to be simultaneously transmitted to a plurality of n child devices 21 to 2n, and that each child device individually transmits its state data to the parent device 10. Each child device 21 to receive the ₀ sequence
2n and each response data R ₁ from each child device 21 to 2n to the parent device 10
~ The monitoring control network 100 consisting of the monitoring control device 11 of the parent side 10 that receives and monitors R _n is duplicated in the monitoring control device 11 of the parent side 10 and the newly added monitoring device 30A in parallel therewith. It was configured to monitor. The monitoring device 30A newly added to the monitoring control device 11 of the parent side 10 includes a request receiving unit 31A for branching and receiving request data S ₀ to be simultaneously transmitted from the parent side 10 to the child sides 21 to 2n, and each child device. A plurality of n response data R ₁ to R _n individually transmitted from 21 to 2n to the parent device 10 are aggregated into one by a so-called wired OR, and the parent device 10 on the transmitting side arbitrarily selects, for example, the child device 21. By enabling output enable processing, the child device 21
Response data receiving section 32 for selectively receiving response data R ₁ from
Had A and.

[0003]

The response data receiving section 32A in the monitoring device 30A newly added to the monitoring control device 11 on the parent side 10 by the conventional dual monitoring system of polling is as described above.
A plurality of n response data R ₁ to R _n individually transmitted from the respective child devices 21 to 2n to the parent device 10 are integrated into one by a wired OR, and the parent device 10 outputs the data to the desired child device 21. By enabling the enable process, the response data R ₁ from the slave device 21 is selectively received.
All the transmission lines of the response data R ₁ to R _n from 21 to 2n are connected to one by the wired OR of the response data receiving unit 32A, and the response data from the desired child device 21 of the parent device 10 is transmitted. R ₁ wraps around the transmission lines of the response data R ₂ to R _n of the other child devices 22 to _2n and overlaps with a delay, and only the response data R ₁ from the desired child device 21 can be stably received. There was a problem of not having.

An object of the present invention is that the monitoring device 30 newly added to the monitoring control device 11 on the parent side responds to a request from the child device 21 arbitrarily selected by the parent device 10 among the plurality of child devices 21 to 2n. Data R ₁
Is to realize a dual monitoring system of polling that can always selectively receive.

[0005]

The basic structure of claim 1 of the present invention for achieving this object is, as shown in the principle diagram of FIG. 1, a monitoring device 30 newly added to the monitoring control device 11 on the parent side. The response data reception configuration of the conventional response data receiving unit 32A
Multiple wired devices from parent device 10 instead of wired OR of
A detector 31 for branching the request data S ₀ to be transmitted to 21 to 2n and detecting the device number of the child device 21 which the parent device 10 on that format arbitrarily desires, and each child device controlled by the detection signal. From the plural n response data R ₁ to R _n from 21 to 2n, only the response data R ₁ from the desired slave device 21 of the master device 10 is selected and fetched. Constitute.

Alternatively, referring to the configuration diagram of FIG. 2 corresponding to claim 2 of the present invention, the response data reception configuration of the monitoring device 30 newly added to the parent-side monitoring control device 11 is set to the conventional response data. Not the wired OR of the receiver 32A, but each child device 21-
The logical sum circuit 35 outputs the logical OR of a plurality of n response data R ₁ to R _n from 2n and outputs the response data R ₁ from the slave device 21 desired by the parent device 10.

[0007]

In the configuration of FIG. 1 according to claim 1 of the present invention, the detector 31 of the device number of the child device in the monitoring device 30 newly added to the monitoring control device 11 on the parent side, and the parent device 10 each The request data S ₀ of the sequence to be transmitted to the child devices 21 to 2n is branched and received, and the device number of the child device 21 desired by the parent 10 on the format is detected. Then n-1 selector 32, the is controlled by the detection signal of the detector 31, the response data R ₁ child device 21 desired in the response data R ₁ ~ R _n of a plurality n of from the child device 21~2n
Since only the selected device is loaded, each child device 21
All the transmission lines of the response data R ₁ to R _n from ˜2n are connected by a wired OR, and the response data R ₁ from the desired slave device 21 is transmitted to the transmission lines of the other slave devices 22 to 2n. The response data R ₁ that has been wraparound delayed overlaps and becomes unstable, and the adverse effects such as being unable to stably select and receive the response data R ₁ from the desired slave device 21 are eliminated.

In the configuration of FIG. 2 according to claim 2 of the present invention, since the response data receiving section 32 of the monitor device 30 newly added to the monitor control device 11 on the parent side is the logical sum circuit 35, a plurality of n child units are provided. apparatus
Since the OR of the response data R ₁ to R _n separately transmitted from 21 to _2n is ORed, and the response data R ₁ from the corresponding slave device 21 when the parent device 10 transmits a desired control signal is fetched. Similarly to claim 1, the parent device 10 can stably select and receive the response data R ₁ from the desired child device 21.

[0009]

FIG. 3 is a block diagram of the embodiment of claim 1 of the present invention, and FIG. 4 is a block diagram of the embodiment of claim 2 of the present invention. In the configuration of the first embodiment of FIG. 3, the master device 10, which is the master device, uses the control signal output from the polling control unit 11 as the slave device, which is the slave device that is the slave devices of the plurality n of transmission devices 111 to 11n. Request data requesting 21 to 2n to receive the sequence of each control data and send the status data of each device
S ₀ is transmitted all at once, the slave devices 21 to 2n, which are a plurality n of child devices, receive them, and individually transmit the response data R ₁ to R _n to the master device 10 as a parent. And master device 10
The wired OR of the receiving device 12 in the inside consolidates all the transmission paths of the response data R ₁ to R _n into one, and the parent 10 of the transmitting side (each slave device 21 to 2n) arbitrarily by the enable processing the output of the response data R _1, for example, slave device 21 desires to output only the response data R ₁ 1 pieces of in the n transmission lines to said wired OR, the polling control unit 11 Existing monitoring and control network 100 to be monitored by
A monitoring device 30 is newly added for double monitoring. The added monitoring device 30 receives the request data S ₀ transmitted from the master device 10 of the existing monitoring control network 100 to the slave devices 21 to 2n, receives the received data 31 and shapes the waveform. And a polling monitoring unit 33 that monitors the output,
Response data from each slave device 21 to 2n to the master device 10
R ₁ to R _n are branched and received, and the output of the polling monitoring unit 33 outputs the device number of the corresponding slave device 21 in the format of the request data S ₀ from the master device 10 to the slave devices 21 to 2 _n as a selector control signal. N-1 selector 32 to select as
The polling monitoring unit 33 receives the output of the selector 32 and performs waveform shaping, etc., and the polling monitoring unit 33 outputs response data from the desired slave device 21.
And R _1, to confirm the response data R ₁ as compared from the master device 10 outputs the request data S ₀ to the slave devices 21~2n of the receiving device 31. Since no looped connection due to the conventional wired OR occurs in the transmission path of the response data R ₁ to R _n from each slave device 21 to 2n to the master device 10,
Response data R ₁ from the slave device 21 desired by the master device 10
However, it does not wrap around to the transmission paths of the other slave devices 22 to 2n and are not delayed and overlapped, and stable selective reception is possible.

In the configuration of the second embodiment shown in FIG. 4, the first embodiment shown in FIG.
Similar to the configuration of the embodiment, the response data receiving unit 32 of the added monitoring device 30 is configured by a logical sum gate 35 instead of the n-1 selector 32, and each slave device 21 to 2n is connected to the master device. The response data R ₁ to R _n to 10 are branched and input, and the OR processing of them is performed, and the parent device 10 outputs the response data R ₁ from the child device 21 desired. Then, since it is input to the polling monitoring unit 32 through the receiving device 34 such as waveform shaping, in the polling monitoring unit 32, for example, the slave device 21 of the child device which the master device 10 of the parent arbitrarily sends the control signal. It is possible to selectively monitor the response data R ₁ from.

[0011]

As described above, according to the present invention, a new monitoring device is newly added without changing the existing monitoring control network of the polling operation from the parent device to the plurality of child devices, and double monitoring is performed. Therefore, it is possible to obtain the effect of enabling the construction of a monitoring control network with higher reliability. Also, by adopting a configuration in which a monitoring device for double monitoring can be added later, it becomes possible to easily cope with the necessity / unnecessity of double monitoring due to the configuration of the signal route, and reduce the cost of the monitoring control network by polling. The effect of reducing is obtained.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a basic configuration of a dual monitoring system for polling according to claim 1 of the present invention.

FIG. 2 is a configuration diagram of a dual monitoring system for polling according to claim 2 of the present invention.

FIG. 3 is a configuration diagram of a dual monitoring system for polling according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a dual monitoring system for polling according to an embodiment of claim 2 of the present invention.

FIG. 5 is a configuration diagram of a conventional dual monitoring system for polling.

[Explanation of symbols]

10 is a master device which is a parent device of the existing supervisory control network 100, 11 is its polling control unit, 111 to 11n are multiple n transmission devices, 12 is a device for receiving response data from multiple n child devices, 21 2n is a slave device that is a child device of a plurality of n, 30 is a monitoring device added to the master device 10, 31 is a detector that is a detector of the number of any child device in the request data of the parent device 10, and a receiving device, 32 Is an n-1 selector that selects one from a plurality of n response data, 33 is a polling monitoring unit, 34
Is a receiving device, and 35 is a logical sum circuit of a plurality of n response data.

Claims (2)

[Claims] 1. A parent device (10) to a plurality of child devices (21 to 2n)
To the parent side (10) of the request data to be sent simultaneously to the parent device and the response data to be sent individually from each child device to the parent device (1)
1) and a monitoring device (30) newly added in parallel therewith, in the dual monitoring system of polling for receiving and monitoring, the newly added monitoring device (30) has a plurality of parent (10) ( n) child (21 ~ 2
Controlled by the detector (31) for branching and receiving the request data to n) and detecting the number of the desired slave device (21) by the master device (10) on that format. Select (32) the response data (R ₁ ) from the desired slave device (21) among the multiple (n) response data (R _{1 to} R _n ) from each slave device (21 to 2n) ) And a dual polling monitoring system. 2. The newly added monitoring device (30) takes a logical sum of a plurality (n) of response data (R ₁ to R _n ) from each child device (21 to 2n) and acquires the parent device (10). 2. The double monitoring system for polling according to claim 1, further comprising a logical sum circuit (35) for outputting the response data (R ₁ ) from the desired slave device (21).