JPH0145642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence control device used when signals are exchanged between an existing control panel and an additional control panel in a control panel housing a relay sequence circuit or the like.

[Technical background of the invention]

During the plant construction stage, it is often necessary to pass contact signals from an existing control panel to an additional control panel, or vice versa.

Conventionally, such cases have generally been dealt with by the following means.

(1) Prepare the contact signals required on the expansion side in advance on the existing side, up to the terminal block of the existing panel.

This situation is shown in FIG. In FIG. 1, reference numeral 10 indicates an existing control panel, and a contact signal 13 of a relay coil 12 is prepared in advance up to a terminal block 11 as a contact signal to be passed to an additional control panel 20. The expansion control panel 20 draws this contact signal 13 into its terminal block 21 and incorporates it into necessary sequence logic.

(2) If the existing side needs to receive signals from the expansion side, provide a spare terminal block on the existing side.
This situation is shown in FIG. In FIG. 2, reference numeral 20 indicates an additional control panel, and a contact signal 23 of a relay coil 22 is prepared in advance up to the terminal block 21 as a contact signal to be passed to the existing control panel 10. Existing control panel 1
0 draws this contact signal 23 into its terminal block 11 and incorporates it into the necessary sequence logic.

In other words, the extension side sequence can be manufactured in such a way that the extension side only needs to receive the contact signal from the existing sequence, but the existing side must receive the contact signal of the extension side sequence before making any modifications. Therefore, it is necessary to modify the existing panel (point A) as shown in Figure 3. FIG. 3a shows an example before modification of the existing panel, FIG. 3b shows an example in which the expansion side signals are inserted in series in the existing panel sequence, and FIG. 3c shows an example in which they are also inserted in parallel.

[Problems with background technology]

The following problems arise when adding wiring to such a conventional configuration.

In case (2), the existing facility will need to be modified in conjunction with the expansion. There is no problem if the operation of the existing unit can be stopped during expansion, but when adding more operating units to a plant, it is generally desirable to continue operating the existing operating units to maintain availability. However, operations on the existing side will have to be suspended until construction on the expansion side is completed.

In case (1), if the existing side continues to operate during the expansion as described in the previous paragraph, contact operation on the existing side may become a disturbance on the expansion side before the expansion work is completed.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sequence control device that eliminates the drawbacks of the conventional system and allows easy addition of operation units without causing any disturbance to the sequence control.

[Summary of the invention]

The outline for achieving the purpose of this application is to provide a relay terminal board between the existing control panel and the expansion control panel, which has a switching switch that allows mutual transmission and reception of signals, and to bypass the relay terminal board. By sending and receiving signals between the existing control panel and the expansion control panel, the expansion can be carried out without stopping the operation of the existing control panel.
Moreover, it is an object of the present invention to provide a sequence control device that prevents signals from a control panel on the expansion side before construction is completed from disturbing signals on the existing side during continued operation.

[Embodiments of the invention]

An embodiment of the present application will be described below with reference to FIGS. 4 and 5.

Figure 4 shows the relay coil 12 of the existing control panel 10.
This is a configuration in which the contact signals 131 and 132 are passed to the additional control panel 20 via the relay terminal board 30.

The existing control panel 10 is previously equipped with a relay 12 that responds to the contacts 16 passed to the additional control panel 20. This relay 12 has two circuits of first and second normally open contacts 131 and 132, one normally open contact 131
is between terminals AB, and the other normally open contact 132 is between terminals C and
The configuration is such that the terminals of D are connected in advance.

The relay terminal board 30 has, for example, eight terminals A, B, C...H, and a first and second terminal when expanding one unit.
switch circuits 31 and 32, the first switch circuit 31 has a lock, and the first fixed contact 31
2 to the A terminal, the second fixed contact 311 to the B and F terminals, and the keyed movable contact 310 to the E terminal. The second switch circuit 32 has a key, and has a fixed contact 321 connected to a C terminal, and a movable contact 320 with a key connected to a G terminal. Note that the D and H terminals are short-circuited.

The expansion control panel 20 includes two relays 24, 25,
Two normally open contacts 26, 27 and A, B, C, D
The first normally open contact 26 is placed between the terminal A and one of the power sources, the first relay coil 24 is placed between the terminal B and the other side of the power source, and the first normally open contact 26 is placed between the terminal B and the other side of the power source. The terminal is connected to one end of the power source, the second normally open contact is connected between one end of the power source and the D terminal, and the second relay coil 25 is connected between the D terminal and the other end of the power source. Connecting.

In the connection between the existing control panel 10, the relay terminal board 30, and the expansion control panel 20, the terminals A, B, C, and D of the existing control panel 10 are connected to the terminals A, B, C, and D of the relay terminal board 30.
Relay terminal board 30 corresponding to each terminal of B, C, and D
The E, F, G, and H terminals are connected to the A, B, C, and D terminals of the expansion control panel 20, respectively.

It should be noted that it will be more convenient if the relay terminal board 30 is built into the existing control board 10 in case of expansion at a later date. It is not necessarily necessary to provide a relay terminal board on the existing control panel.

Next, the operation of such a configuration will be explained.

Keyed movable contact 310 of the first switch circuit 31
Fold it toward the A terminal side. The first relay 24 of the additional control panel 20 is connected between the power supplies of the additional control panel when the logical product of the contact 26 of the additional control panel and the relay contact 131 of the existing control panel is established. Therefore, the control contact signal 16 of the existing control panel 10 is transmitted to the control panel 20 on the expansion side. The sequence of the expansion side control panel is operated by incorporating the control contacts of the existing control panel into the sequence.

Keyed movable contact 310 of the first switch circuit 31
By switching from the A terminal to the B and F terminals, the existing control panel 10 and the additional control panel 20 are disconnected. Therefore, the existing control panel 10 is the expansion control panel 2.
The additional control panel 20 is not affected by the sequence operation of the existing control panel 10. In other words, the expansion control panel 20
Even during the operation of the existing control panel 10, disturbances generated when the existing control panel 10 is modified will not affect the signals of the existing control panel 10. The reverse is also true.

Next, the operation of the second switch circuit 32 will be explained. As shown in the figure, in the open state, the second relay 25 operates in response to the opening and closing of the control contact 27 of the additional control panel 20. When the movable part of the switch circuit 32 is closed, the second relay 25 is activated every time the logical OR between the control contact 27 of the additional control panel 20 and the existing control contact 132 is established. Therefore, if it is used as a contact point of the second switch circuit 32, the sequence operation of the additional control panel 20 and the sequence operation of the existing control panel 10 are separated. Sequential operation of individual control panels is possible without mutual interference. If the switch contact is closed, the expansion control panel 20
The relay 25 operates every time the logical sum of the control contact 27 on the expansion side and the control contact 132 on the existing side is logically ORed. The sequence system of the additional control panel 20 is operated by taking in the contacts of the existing control panel during sequence operation. Signals were exchanged.

FIG. 5 shows the relay coil 22 of the expansion control panel 20.
This is a configuration for passing the contact signal 27' to the existing control panel 10 via the relay terminal board 30.

The existing control panel 10 includes first and second relays 14 and 15 that receive contact signals 231 and 232 from the additional control panel 20, and first and second normally open contacts 17 and 1.
8 and A, B, C, and D terminals, the first normally open contact 17 is connected between the A terminal and one of the power sources, and the first relay coil 14 is connected between the B terminal and one of the power sources. The terminal C is connected to one end of the power supply, the second normally open contact is connected between one end of the power supply and the terminal D, and the second relay coil 15 is connected to the terminal D and the other end of the power supply. Connect in advance between each end.

The relay terminal board 30 has, for example, eight terminals A, B, C, D...H, and first and second switch circuits 33 and 34 in one unit expansion, and the first switch circuit 33 has a first The fixed contact 331 is connected to the E terminal, the second fixed contact 332 is connected to the B and F terminals, and the keyed movable contact 330 is connected to the A terminal. The second switch circuit 34 has a fixed contact 341
is connected to the G terminal, and the keyed movable contact 340 is connected to the C terminal. Note that the D and H terminals are short-circuited.

The additional control panel 20 is previously equipped with a relay 22 and four terminals A, B, C, and D that respond to the contact 27' passing to the existing control panel 10. This relay 22 is 2
It has first and second normally open contacts of the circuit, one normally open contact 231 is pre-connected between terminals A and B, and the other normally open contact 232 is connected between terminals C and D, respectively. composition.

In the connection between the existing control panel 10, the relay terminal board 30, and the expansion control panel 20, the terminals A, B, C, and D of the existing control panel 10 are connected to the terminals A, B, C, and D of the relay terminal board 30. The E, F, G, and H terminals of the relay terminal board 30 correspond to the terminals of the expansion control board 20.
Connect them to the A, B, C, and D terminals of the

Next, the operation of the device having such a configuration will be explained.

If the first and second switch circuits 33 and 34 of the relay terminal board 30 are in the contact state as shown in the figure, the sequence control of the existing control panel 10 and the control of the expansion are performed by the action of the switch circuit of the relay terminal board 30. Board 2
0 sequence control becomes disconnected.
In other words, the existing control panel 10 and the expansion side control panel 20
Each can be operated independently.

Next, when the switch states of the first and second switch circuits 33 and 34 of the relay terminal board 30 are set to the dotted line state, the first relay 14 of the existing control board 10 receives the control contact signal 17 of the existing side and the control of the expansion side. A logical AND operation is performed on the contact signal 231, and a response is taken every time it is established. The second relay 15 responds each time a logical OR operation is performed on the control contact signal 18 on the existing side and the control contact signal 232 on the expansion side. That is, the control contact signal on the expansion side can be given to the existing control panel depending on the switch state of the switch circuit of the relay terminal board.

As described above, in this application, the sequence control system of the existing control panel and the sequence control system of the expansion control panel are combined or separated by controlling the relay terminal board to exchange and bypass signals between the existing control panel and the expansion control panel. Because of this configuration, even during expansion work, the changeover switch 31 and the open/close switch 32 can avoid the influence of tests on the expansion side alone on the existing side. Further, in the present invention, the operation of the existing side alone can be continued by using the changeover switch 33 and the open/close switch 34 even before the expansion work is implemented. Furthermore, the present invention allows continued operation without being affected by expansion work. By continuing this operation, the present application has a very large effect of improving the operating rate and facility utilization rate.

If the present application is adopted, the expansion side can simply switch the switch 31 and the open/close switch 32 during the unit test to eliminate disturbances caused by the contact signal operation of the existing side during continuous operation.
can be eliminated by

In addition, by using a keyed switch used in the relay terminal board of the present invention, operational safety can be maintained.

The present application can be modified in various ways as described below, regardless of the embodiments shown in FIGS. 4 and 5.

(1) The switching switches and open/close switches on the relay terminal board do not have to be installed individually, but may be turned on and off at the same time.

Also, depending on the contact signal, a switch or an open/close switch may be turned on and off at a plurality of points using relay contacts.

(2) If it is necessary to amplify the number of contacts of signals exchanged between the existing control panel and the additional control panel, a single relay may be used to receive the signals.

(3) For the keyed switch on the relay terminal board, a normal switch may be used and the housing door of the relay terminal board may be locked.

(4) Connections between the relay terminal board and the existing control board, and between the relay terminal board and the additional control board, are not limited to terminal block connections, and may be made using connectors.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the relationship between the conventional existing control panel and the expanded control panel, and Figure 3 shows the relationship between the conventional existing control panel and the expanded control panel, from a to b, c.
FIGS. 4 and 5, which show the relationships that have been improved over time, are diagrams showing the configuration of the apparatus of the present invention in a block configuration. 10... Existing control panel, 20... Expansion control panel, 30...
Relay terminal board, 12, 14, 15, 22, 24, 2
5... Relay coil, 31, 32, 33, 34... Switch circuit.

Claims (1)

[Claims] 1. A control panel A having a function of connecting a relay coil to a power source via a first normally open contact and energizing the relay coil by closing the first normally open contact. In the one for connecting the control panel B with new conditions for controlling the relay coil, one terminal of the first normally open contact is connected to the power supply, and the other is connected to the intermediate terminal as an independent two-way terminal.
one of the two terminals other than the intermediate terminal of the first switching means is connected to a second normally open contact provided on the control panel B. a first circuit, the other contact of the second normally open contact being connected to the other terminal other than the intermediate terminal of the first switching means and also connected to the relay coil; The power source of the control board A is connected to one of the terminals of a fourth contact in parallel with the first normally open contact connected to the coil, and the other terminal of this fourth contact is connected to the control board A. B, the other terminal of the third normally open contact is connected to at least one of the second circuits connected to the relay coil. A sequence control device characterized by: