JPH02210502A - Sequence controller - Google Patents

Abstract

PURPOSE:To attain the smooth switch with an operation using no automatic mode, and to obtain an automatic sequence which is naturally and smoothly accepted by an operator by controlling the transition process of an automatic control sequence according to the open/close state of a valve of a controlled system. CONSTITUTION:A control function 8 performs the sequence control of the state transitions of plural controlled system which are shown in the open/close states VP of a complicated value based on the automatic and manual modes. The execution sequence functions 111 - 11m carry out the open/close sequences of the controlled system based on the state transition command received from the function 8 and the state data received from the state monitor functions 101 - 10n. These functions 101 - 10n monitor the open/close states of the valves of the controlled system and supply the state data VP to the function 8 and the functions 111 - 11m. Thus it is possible to facilitate the switch between the automatic and manual controls and to improve the controllability of a sequence controller.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a sequence control device that manages state transitions of a plurality of controlled objects, each represented by the open/closed states of a plurality of valves, in an automatic mode and a manual mode. Regarding improvement of controllability.

<Conventional technology> An example of the prior art will be explained based on FIG.

C is the central control area and F is the field area. In the central control area C, 1 is an operator's station with a man-machine function, 2 is a control station that communicates with the operator's station and executes Siegen control of the controlled object at the site F, and has an automatic mode function 201 and a manual mode function 202. have

In the field area F, 3.32...3o are a plurality of sequence control devices, for example, a typical example is a filtration pond that is connected continuously, and each controlled object controls the open/closed state of a plurality of valves ( Sequence control is executed in which the control state is changed by changing the valve pattern).

To explain the outline on behalf of the controlled object 31, 41.
...4Ill is a plurality of valves, and in the case of a filtration basin, it is a group of inflow and outflow valves for filtered water and wash water.

51...511 are changeover switches for manual operation on site, and operation signals M V from the control station
i...MVll and manual operating device 61 installed on site
...6Il operation signal F■1...FVl is switched and supplied to each valve. This switch is switched and operated by an operator 7 on site.

<Problems to be Solved by the Invention> Management of Siegen control of a controlled object with such a configuration is managed by a control program in the control station 2, and automatic control is performed based on the control status recognized by the control program. Control 1 Perform manual control. The pattern of the open/close state of the valve is used as interlock or abnormality detection information during control state transition and during processing sequence.

In such control, manual operation is only possible through the program (manually changing the control state of the control program) using the function 202 on the control station side.

However, if, for example, the operator 7 switches the switch 5IIl in the field,
In order to avoid discrepancies between the control state on the control program side and the actual control state, it is necessary to stop the execution of the control program or put it into a control hibernation state when on-site operations are executed, and the procedure for restarting operation is complicated and difficult to control. There are problems in that controllability deteriorates, such as longer interruption periods and more complicated operations.

The present invention aims to provide sequence control management that eliminates these problems.

Means for Solving the Problems> The structural features of the present invention include a management function that manages state transitions of a plurality of controlled objects, each represented by the open/closed states of a plurality of valves, in an automatic mode and a manual mode; An execution sequence function that executes the opening/closing sequence of the valves to be controlled based on state transition commands from this management function and status data from the status monitor function (described later), and an execution sequence function that monitors the opening/closing status of the valves to be controlled to monitor the status data. The present invention also includes a status monitoring function that supplies the above-mentioned management function and execution sequence function.

Function> The management function sequentially controls and manages state transitions of a plurality of control objects, each represented by the open/closed states of a plurality of valves, in an automatic mode and a manual mode.

The execution sequence function executes the valve opening/closing sequence of the controlled object based on the state transition command from the management function and the state data from the state monitor function.

The status monitor function monitors the open/close status of the valve to be controlled and supplies status data to the management function and execution sequence function.

<Embodiment> The feature of the present invention is that even if the control state is changed by on-site operation, the open/closed state of the valve can be recognized, and when the automatic control mode returns, automatic operation can be resumed from that control state.

The present invention will be explained in detail based on FIG.

Elements that are the same as those described in FIG. 1 are given the same reference numerals, and their explanations are omitted, and a description of the features of the present invention will be added.

In the control station 2 of the central control area C, 8 is a management program function operated in automatic 1 manual mode, and transition commands C1...CI are sent to the execution sequence function described later.
Send.

9 is an automatic state transition generation function, and state transition required 10.
...10 is a status monitor function corresponding to 31...3o of each controlled object, which monitors the valve opening/closing status of each controlled object (by inputting a contact signal) and receives real-time status data D, D. Each tube ring program function 8
and notifies the execution sequence function 11.

The management program function 8 sends transition commands C1...CI to the execution sequence functions that send transition request messages.

The execution sequence function 11 executes each control target valve 4'.
...4, it is composed of 111...111 t.

and transmits the operation output MV for opening and closing the valve to each controlled object.

The configuration of the execution sequence function will be explained using 111 as a representative. Basically, it consists of a common idle function 12 and a plurality of state transition execution sequence functions 131...13.

These state transition execution sequence functions 131...13.
are the judgment functions 151...15. that pass under the conditions that the AND gates 141...141 are satisfied. Judgment functions 171...17. are activated from the idle function 12 side via the idle function 12, and information on the completion or interruption of execution passes under the conditions of the OR gates 161...161. is returned to the idle function 12 side via , and activated.

ANDGATE 141...14. The conditions for this are that transition commands 181...181 exist and the valve pattern is a pattern specified by the transition command (OK
) is the case where the output of the check functions 191...19 is OK.

Status data D8 from the status monitor function is referred to to confirm whether the valve pattern is OK.

That is, even if there is a transition command, if the valve pattern that is a condition for executing the transition command does not match the state data DB, the state transition execution sequence will not be activated.

OR gates 161 . . . 16 . which regulate the passage of information regarding completion or interruption of execution. The condition for this is the processing completion notification 201
. . 201 exists, or the output of the check function 211 . . . 21° of an unacceptable valve pattern occurs. That is, if the valve pattern becomes an unacceptable pattern during state transition execution or sequence execution, the sequence execution is stopped and the idle function 12 is activated.

The status data D8 from the status monitor function is also referred to in checking this valve pattern.

With such a configuration, when the idle state function is in the activated state, the transition command C1 from the management program function...
The state transition execution sequence will not work unless a CI arrives. Also, if the control is not set to manual mode, the transition command C1.
...Since C□ is never transmitted, there is no execution of the state transition execution sequence.

Therefore, if the execution sequence function is in an idle state and the state of the controlled object is changed by opening/closing the valve by manual operation by an on-site operator or manual operation from the management program side, and then switching to automatic mode again, the valve pattern will change. If the command conditions are met, the sequence can be executed again.

FIGS. 2 to 4 are flowcharts showing processing procedures for each function. FIG. 2 shows the operating procedure of the management program function 8, which always checks the existence of S in a request message, and if a message exists, refers to the request contents, status data contents, and control mode A to control the object to be controlled. extract,
If there is a corresponding target, a transition command C is sent, and if the target does not exist, an error message is output.

FIG. 3 shows the operation procedure of the automatic state transition generation function 9,
Always checks the request generation conditions, and when a request occurs, determines the type of request, and follows the judgment results in order.Always checks the opening/closing pattern of each controlled valve and sets status data D and DB in real time. do.

<Effects of the Invention> As explained above, according to the present invention, since the transition process of the automatic control sequence is managed according to the open/closed state of the valve to be controlled, operation without using automatic mode and smooth switching are possible. This is an automatic sequence that can be easily accepted by operators accustomed to manual operation or valve pattern recognition.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIGS.
The diagram shows the management program function, automatic state transition generation function,
Flowchart diagram showing the operating procedure of the condition monitor function,
FIG. 5 is a configuration diagram showing an example of the prior art. 2... Control station, 3... Controlled object, 7...
・On-site operator, 8... Management program a female, 9
... automatic state transition generation function, 10 ... state monitor function, 11 ... execution sequence function, 12 ... idle state function, 13 ... state transition execution sequence function, 14 ... AND gate, 15.17... Judgment function, 16... OR gate, 18... Transition command, 19.
...Valve pattern OK check function, 20...Processing completion function, 21...Unallowable valve pattern check function Figure 3 Automatic status compliance function

Claims (1)

[Claims] A management function that manages state transitions of multiple control objects, each represented by the open/closed states of multiple valves, in automatic mode and manual mode, state transition commands from this management function, and state data from the state monitor function described below. an execution sequence function that executes an opening/closing sequence of the valve to be controlled based on the above, and a status monitor function that monitors the opening/closing state of the valve to be controlled and supplies status data to the management function and the execution sequence function. Sequence control device.