KR20030004982A - Pio control apparatus - Google Patents

Abstract

PURPOSE: To obtain a PIO controller to dispense with reconnection of a PIO signal by appropriating the existing PIO, application of which is enabled for facility update with short stop time by enabling switching and connection of only new and old controller parts and to realize reduction of time and expenses required in construction for the facility update of a plant controller. CONSTITUTION: The PIO controller is provided with a control circuit 20a with which a plurality of I/O cards 24, 25 are connected, a memory 20b, a bus changeover switch 14 to be turned ON/OFF by the control circuit 20a and two I/O bus cable 23 to be selected via the bus changeover switch 14, the control circuit 20a is selectively switched and connected with two different plant controllers 21, 22 via the bus changeover switch 14 and the two I/O bus cables 23.

Description

PIO CONTROL APPARATUS

The present invention records a process input / output (hereinafter referred to as "PIO") of a plant controller that is applied to a distributed control system that performs process control (control of input signals such as switches and sensors installed in plants and output signals such as relay valves). Control device In particular, it relates to a PIO control device having a switching function for two plant controllers.

Conventionally, when updating a plant controller connected to a PIO control apparatus with a new plant controller newly installed from an existing plant controller, it is necessary to stop the plant equipment for a long time.

That is, when updating the plant controller, it is necessary to stop the facility, switch the connection of the PIO signal to the new plant controller, and adjust the software of the new plant controller (hereinafter referred to as "S / W").

If the PIO signal of the existing plant controller needs to be monitored by the new plant controller, the cable must be cut once, the PIO signal must be amplified by a relay, etc. There is.

In addition, it is necessary to change the S / W of the new plant controller during the transition transition period during and after the plant controller update, and to create two types of S / W during the transition period and after the transition.

As the conventional PIO control device changes the connection of the PIO signal to the new plant controller when the plant controller is renewed as described above, it is necessary to stop the plant equipment for a long time and require a large construction period and cost. There was this.

If it is necessary to motor the PIO signal, it is necessary to cut the cable, amplify the PIO signal with a relay, etc., and then reapply the cable. Therefore, there has been a problem that a huge cost and a period are required.

In addition, the S / W adjustment of the new plant controller needs to be executed within a limited period of time, such as when the installation is stopped, at the time of plant controller update, and there are many restrictions, and two kinds of S / W corresponding to the transition period and after switching are required. There was a problem that cost a lot of time, such as cost, air test.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by adding the switching function of the plant controller, the existing PIO is useful without changing the line of the PIO, making switching between two new and different plant controllers easy and long-term. The objective is to obtain a PIO control device that avoids equipment shutdown and does not require replacement of PIO signals.

In addition, the present invention significantly shortens the S / W adjustment time of the new plant controller by adding a function of monitoring the PIO input signal of the existing plant controller, and during the transition period to the new plant controller and after switching. The objective is to obtain a PIO control device that does not require a change in / W.

The PIO control device according to the present invention includes a control circuit to which a plurality of I / O cards are connected, a memory connected to the control circuit, a bus switch switch in which ON / OFF is switched by the control circuit, and a bus switch switch. Two IO bus cables are selected, and the control circuit is selectively switched to two different plant controllers via a bus changeover switch and two IO bus cables.

In addition, the two plant controllers of the PIO control apparatus according to the present invention include an existing plant controller and a newly installed plant controller, and the control circuit is the first PIO of the existing plant controller that is operating while selecting the existing plant controller. First PIO storage means for storing an input signal in a memory, and first monitoring means for transmitting data in the memory to the new plant controller and for monitoring the first PIO input signal in the new plant controller.

In addition, the control circuit of the PIO control apparatus according to the present invention includes a second PIO storage means for storing two PIO signals output from the new plant controller in a memory during selection of the existing plant controller.

In addition, the PIO control apparatus according to the present invention includes a nonvolatile memory connected to the memory, and the control circuit determines the presence or absence of the guard for determining whether the I / O card is present by accessing the I / O card when the new plant controller is started. And card data storage means for storing the response signal from the I / O card in the nonvolatile memory when the presence / absence of the I / O card is determined, and a second for transmitting and monitoring only the card data having the response signal to the newly plant controller. It is equipped with the monitoring means of.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an entire system of a PIO control device with a switching function according to a first embodiment of the present invention.

Fig. 2 is a block diagram illustrating the equipment update procedure of the plant controller to which Embodiment 1 of the present invention is applied.

Fig. 3 is a block diagram for explaining the equipment update procedure of the plant controller to which Embodiment 1 of the present invention is applied.

4 is a block diagram for explaining the equipment update procedure of the plant controller to which Embodiment 1 of the present invention is applied.

Fig. 5 is a block diagram showing an entire system of a PIO control device with a switching function according to a second embodiment of the present invention.

Fig. 6 is a block diagram for explaining the startup procedure of the new plant controller according to the fourth embodiment of the present invention.

Fig. 7 is a block diagram for explaining the startup procedure of the new plant controller according to the fourth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

14.Bus changeover switch, 20. PIO controller,

20a. Control circuit, 20b. Memory,

21. existing plant controllers; 22. New Plant Controller,

21a, 22a. Program, 23. Io bus cable,

24 I / O card, 25. Midyear I / O card,

20c. Nonvolatile memory,

Embodiment 1

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 1 of this invention is described in detail, referring drawings.

1 is a block diagram schematically showing a first embodiment of the present invention.

In Fig. 1, the control circuit 20a of the PIO control device 20 includes switching control means for controlling the switching of the IO buses of two different plant controllers (to be described later), and an I / O card connected to the mid-range IO bus ( Storage means for storing in the information memory 20b of the following).

The IO bus connection connector 11 connects the IO bus cable (to be described later) of the existing plant controller to the control circuit 20a.

The connector 12 for connecting the IO bus connects the IO bus cable (to be described later) of the new plant controller to the control circuit 20a.

The bus changeover switch 14 is switched to selectively activate either of the connectors 11 and 12 under the control of the control circuit 20a.

The connector 15, 16 for the intermediate IO bus connection connects an IO bus cable (to be described later) to the control circuit 20a in order to neutralize the I / O card to the PIO control device 20.

Next, operation | movement by Embodiment 1 of this invention shown in FIG. 1 is demonstrated.

First, the control circuit 20a reads the ON / OFF state of the bus changeover switch 14, connects the connector 11 for connecting the IO bus of the existing plant controller, and the connector 12 for connecting the IO bus of the new plant controller. And which one is connected to the connectors 15 and 16 for the intermediate IO bus connection.

At this time, the new plant controller side is selected when the bus selector switch 14 is ON, as described later, and the existing plant controller side is selected when the bus selector switch 14 is OFF.

Next, with reference to FIGS. 2-4, the plant controller update procedure using the PIO control apparatus with a switching function by Embodiment 1 of this invention is demonstrated.

2-4 is a block diagram showing the plant controller update procedure using Embodiment 1 of this invention, and the same code | symbol is attached | subjected about the same thing as the above-mentioned (refer FIG. 1) at an angle, and detailed description is abbreviate | omitted.

FIG. 2 is a connection state to the existing plant controller 21, FIG. 3 is a state at the time of parallel adjustment with the existing plant controller 21 and the new plant controller 22 connected, and FIG. 4 is a selection of the new plant controller 22. The status (program adjustment completion status) is displayed respectively.

In FIG. 3, the existing plant controller 21 and the newly installed plant controller 22 are connected to the control circuit 20a in the PIO control device 20.

In addition, the existing plant controller 21 and the new plant controller 22 own the respective programs 21a and 22a.

The control circuit 20a in the PIO controller device 20 is connected to the I / O card 24 and the center I / O card 25 via the IO bus cable 23.

In addition, the control circuit 20a is connected to the plant controller 21 or 22 via the bus changeover switch 14 and the IO bus cable 23.

The memory 20b and a plurality of I / O cards 24 and 25 are connected to the control circuit 20a.

The control circuit 20a switches ON / OFF of the bus selector switch 14 to select two IO bus cables 23 and through the bus selector switch 14 and two IO bus cables 23. It is selectively switched to two other plant controllers 21 and 22.

First, in the existing state of FIG. 2, the existing PIO control device 20A is connected to the I / O card 24 and, via the IO bus cable 23, the existing plant controller 21 and the mid-range I / O card. It is connected to (25).

Here, in FIG. 2, in order to set it as the structure at the time of the parallel run of FIG. 3 in an existing state, the existing PIO control apparatus 20A is replaced with the PIO control apparatus 20, and a new plant controller 22 is newly installed. do.

At this time, as shown in FIG. 3, the bus selector switch 14 is in the OFF state, and the existing plant controller 21 is connected to the control circuit 20a.

In this state, during the operation by the existing plant controller 21, the program 22a of the new plant controller 22 is adjusted to perform parallel run adjustment.

When the adjustment of the program 22a is completed, as shown in Fig. 4, the existing plant controller 21 is removed from the connection target of the control circuit 20a, and only the new plant controller 22 is connected. Update

In this way, by adding the switching function of the bus switching switch 14 to the PIO control section of the PIO control apparatus 20 with respect to the plant controllers 21 and 22, the new plant controller ( 21) and 22 can be easily switched.

In addition, the configuration of connecting two different plant controllers 21 and 22 eliminates the need to shut down the equipment for a long period of time, and eliminates the need to replace the PIO signals.

In other words, when the equipment is updated from the existing plant controller 21 to the new plant controller 22, it is unnecessary to change the connection of the PIO signal. Therefore, it is applicable to the equipment update with short downtime, and the time required for construction is reduced and the cost is reduced. Reduction can be realized.

Embodiment 2

In addition, although the data storage processing and the monitoring function for the memory 20b are not mentioned in the first embodiment, specifically, the monitoring function is realized by storing data as follows.

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 2 of this invention provided with a monitor function is demonstrated, referring drawings.

Fig. 5 is a block diagram showing a system using Embodiment 2 of the present invention, and the same reference numerals are used to omit the above description for the same components as those described above (see Fig. 3).

In FIG. 5, the control circuit 20a includes PIO storage means for storing the PIO input signal of one existing plant controller 21 in the memory 20b while the existing plant controller 21 is being selected, and the newly plant controller 22. In FIG. ), Monitoring means for transmitting the data in the memory 20 to the new plant controller 22 and sending it to the new plant controller 22.

First, as shown in FIG. 5, when the bus changeover switch 14 is OFF, the control circuit 20a is connected to the existing plant controller 21 via the bus changeover switch 14 and the IO bus cable 23. As shown in FIG.

In this state, the program 21a of the existing plant controller 21 accesses the I / O card 24 and the mid-range I / O card 25 with respect to the control circuit 20a, and the I / O card ( 24) and the input signal (PIO signal) of the mid-range I / O card 25 are transferred to the existing plant controller 21 and stored in the memory 20b.

At this time, when the program 22a of the new plant controller 22 accesses the I / O card 24 and the mid-range I / O card 25, the control circuit 20a returns a value stored in the memory 20b. Via the IO bus cable 23, the new plant controller 22 is conveyed.

Therefore, when the equipment is updated from the existing plant controller 21 to the newly plant controller 22, the PIO input signal of the existing plant controller 21 can be monitored.

As a result, the S / W of the new plant controller 22 can be adjusted, and the S / W back adjustment time and the plant adjustment time of the new plant controller 22 can be significantly reduced even during the facility operation.

In addition, the PIO control device 20 does not affect the access speed of the existing I / O card 24 and the mid-range I / O card 25, and the I / O card 24 and the mid-range I / O card. Since the input signal of (25) is stored in the memory 20b, it can be configured cheaply only by hardware without mounting a microprocessor.

Embodiment 3

In addition, although the PIO output signal (output data recording to memory 20b) by the new plant controller 22 is not mentioned in Embodiment 2, the output data of the new plant controller 22 is specifically recorded as follows. .

Hereinafter, with reference to FIG. 5 mentioned above, Embodiment 3 of this invention which comprised the output data of the new plant controller 22 so that recording was possible is demonstrated.

In this case, the control circuit 20a includes second PIO storage means for storing the PIO signal output from the new plant controller 22 in the memory 20b while the existing plant controller 21 is being selected.

First, as shown in Fig. 5, when the bus changeover switch 14 is in the OFF state, the control circuit 20a is connected to the existing plant controller 21 via the IO bus cable 23.

In this state, even if the program 22a of the new plant controller 22 attempts to write output data (PIO signal) to the I / O card 24 and the mid-range I / O card 25, the PIO control device ( Since the control circuit 20a in 20 is operated by the existing plant controller 21, output data cannot be written to the I / O card 24 and the mid-range I / O card 25. As shown in FIG.

Therefore, when the program 22a of the new plant controller 22 tries to write the output data to the I / O card 24 and the mid-range I / O card 25, the control circuit 20a outputs the output data I. The / O card 24 and the intermediate I / O card 25 are stored in the internal memory 20b without being transferred.

In this way, when the program 22a of the existing plant controller 22 attempts to write the output data to the I / O card 24 and the intermediate I / O card 25, the control circuit 20a outputs the output data I. The / O card 24 and the intermediate I / O card 25 are stored in the internal memory 20b without being transferred.

In this way, when the equipment is updated from the existing plant controller 21 to the new plant controller 22, the output data of the new plant controller 22 can be stored while the existing plant controller 21 is in operation.

Therefore, the program 22a of the new plant controller 22 can output the PIO signal, and the S / W change of the new plant controller 22 is unnecessary during the transition execution period, during the transition and after the transition. The design time and deback time of / W can be greatly reduced.

Embodiment 4

In the first to third embodiments, the storage means for storing the response signals from the I / O card 24 and the I / O card 25 is not mentioned. Specifically, the I / O card 24 and The response signal from the I / O card 25 is stored in the nonvolatile memory.

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 4 of this invention is described, referring drawings.

6 and 7 are block diagrams for explaining the initial start-up operation of the new plant controller 22 according to Embodiment 4 of the present invention. Omit.

FIG. 6 shows a state of initial startup of the newly plant controller 22, and FIG. 7 shows a state of return connection to the existing plant controller 21. As shown in FIG.

6 and 7, the PIO control apparatus 20D includes a nonvolatile memory 20c connected to the control circuit 20a and the memory 20b.

In addition, the control circuit 20a accesses the I / O cards 24 and 25 at the initial startup of the new plant controller 22, and determines whether there is an I / O card, and whether there is an I / O card. Card data storage for storing response signals R1 and R2 from the I / O cards 24 and 25 in the nonvolatile memory 20c when the presence or absence of the O cards 24 and 25 is determined. Means, and second monitor means for transmitting and monitoring only the card data having the response signals R1 and R2 to the new plate controller 22.

First, as shown in FIG. 6, prior to the equipment update, the new plant controller 22 is selected as the connection target to the control circuit 20a by switching the bus switching switch 14 from the OFF state to the ON state.

As a result, the new plant controller 22 is initially started and accesses the I / O card 240 and the mid-range I / O card 25, and the I / O card 24 and the mid-range I / O card 25 Upon determining the presence or absence, the response signals R1 and R2 from the I / O card 24 and the intermediate I / O card 25 are stored in the nonvolatile memory 20c.

That is, the response signals R1 and R2 related to the operation of the new plant controller 22 are stored in the nonvolatile memory 20c by the initial startup of the new plant controller 22.

Hereinafter, as shown in FIG. 7, the bus changeover switch 14 is returned to the OFF state, the existing plant controller 21 is returned to the selected state, and the existing plant controller 21 is started.

At this time, only the card data (response signals R1 and R2 from the I / O card 24 and the mid-range I / O card 25) necessary for the operation of the new plant controller 22 are stored in the nonvolatile memory 20c.

Then, when the new plant controller 22 is started during the facility update, the control circuit 20a starts from the card data (I / O card 24 and the mid-range I / O card 25 stored in the nonvolatile memory 20c). The response signals R1 and R2 to the new plant controller 22.

By installing the nonvolatile memory 20c in this manner, when the equipment is updated from the existing plant controller 21 to the new plant controller 22, the new plant controller 22 is first released from the new plant controller 22. Response signal R1 from the I / O card 24 and the commentary I / O card 25 when the I / O card 24 and the commentary I / O card 25 are accessed to determine the presence of a card. , (R2) can be stored in the nonvolatile memory 20c.

Therefore, at the time of actual facility update, the I / O card 24 and the mid-range I / O card required for the new plant controller 22 at the time when the bus changeover switch 14 is turned on and the new plant controller 22 is selected. Only the input data (response signals R1 and R2) of (25) can be monitored, and the start / stop of the new plant controller 22 can be executed asynchronously with the existing plant controller 21.

As described above, according to the present invention, a control circuit to which a plurality of I / O cards are connected, a memory connected to the control circuit, a bus changeover switch switched ON / OFF by the control circuit, and a bus changeover switch Two IO bus cables are selected, and the control circuit is selectively switched to two different plant controllers via two IO bus cables via a bus changeover switch and two IO bus cables. This eliminates the need to replace the PIO signal, which makes it possible to apply the equipment for short downtimes and to achieve a PIO control device that reduces time required for construction and cost.

According to the present invention, the two plant controllers include an existing plant controller and a newly installed plant controller, and the control circuit is configured to receive the first PIO input signal of the existing plant controller that is being operated while selecting the existing plant controller. 1st PIO storage means for storing in a memory, and 1st monitoring means which transmits the data in memory to a new plant controller, and monitors a 1st PIO input signal with a new plant controller. The PIO input signal can be monitored at the time, and the PIO control device which greatly reduces the S / W debag adjustment time and the plant adjustment time of the new plant controller can be obtained.

According to the present invention, the control circuit is provided with a second PIO storage means for storing the second PIO signal output from the new plant controller in the memory while selecting the existing plant controller. It is not necessary to change the S / W of the new plant controller both during the transition period and after the changeover, so that a PIO control device with a significant reduction in the design time and deback time of the S / W can be obtained.

In addition, the PIO control apparatus according to the present invention is provided with a nonvolatile memory connected to the memory, and the control circuit accesses the I / O card at the start of the new plant controller to determine the presence or absence of the I / O card. And card data storage means for storing the response signal from the I / O card in the nonvolatile memory at the time of determining the presence or absence of the I / O card, and a second system for transmitting and monitoring only the card data having the response signal to the new plant controller. Since a monitoring means is provided, the I / O card is accessed during the initial update of the plant controller, and the response signal from the I / O card is transmitted to the nonvolatile memory when the I / O card is judged. Only the input data of the I / O card that stores and outputs the response signal can be monitored, and the start / stop of the new plant controller is performed asynchronously. The PIO control device capable of the effect obtained.

Claims (3)

A control circuit to which a plurality of I / O cards are connected, a memory connected to the control circuit, a bus changeover switch switched ON / OFF by the control circuit, and two I / Os selected through the bus changeover switch And an O bus cable, wherein the control circuit is selectively switched to two different plant controllers via the bus changeover switch and the two I / O bus cables. The method of claim 1, The two plant controllers include an existing plant controller and a newly installed plant controller, wherein the control circuit is configured to receive a first PIO input signal of the existing plant controller in operation while selecting the existing plant controller. And first monitoring means for transmitting the data in the memory to the new plant controller, and for monitoring the first PIO input signal in the new plant controller. PIO control unit. The method of claim 2, And the control circuit comprises second PIO storage means for storing a second PIO signal output from the new plant controller in the memory while selecting the existing plant controller.