JPH05233031A - Mechanism for exchanging data between fa controller and controlled object - Google Patents

Abstract

PURPOSE:To easily and economically realize an interface between an FA controller (sequencer) and various equipments such as a temperature gauge or the like. CONSTITUTION:A serial interface to connect plural temperature gauges 50a-50n is provided on the side of a sequencer 20, and correspondent data bases 30 are provided in this serial interface and the respective temperature gauges. Further, access can be performed to the data base 30 in the interface by operating and referring to the internal relay from the sequencer according to a ladder program. The data base transfer is executed in a fixed period independently of the ladder grogram.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data exchange mechanism between an FA controller and a controlled object, and more particularly to a data interface between a sequencer and a plurality of temperature controllers (hereinafter, simply referred to as temperature controllers).

[0002]

2. Description of the Related Art With the diversification and intelligentization of various processing / assembling machines, FA controllers with self-sustaining ability to perform information processing as well as equipment control have come to be used. FIG. 4 is a diagram showing a configuration of a first example of a data exchange system with a temperature controller, which is developed by the applicant of the present application and uses an FA controller which also performs information processing. 2 shows the software configuration, and (a) shows the software configuration. In this conventional example, in terms of hardware, the sequencer main body 1 includes a serial communication module 2 and is connected to a plurality of temperature controllers 4a to 4d by a serial communication line (RS232C or the like). In terms of software, the sequencer 1 is operated by the ladder program (ladder sequence) 5, and the data exchange between the temperature controller and the sequencer is performed by the interface dedicated B
It is designed to be performed by ASIC (communication interface software).

The shared memory 6 is a memory that can be accessed by both the ladder program 5 and the BASIC program 7, and temporarily stores temperature controller data (PV, SV, alarm contact information, etc.). Ladder program 5
Operates and refers to the data of the temperature controller stored in this shared memory as needed. In addition, the BASIC program 7 periodically takes up temperature controller data, writes it in a predetermined area in the shared memory 6, and when the contents stored in the shared memory are rewritten by the ladder program 5, the data is temperature controlled. It has a function to send to a total of 4. Further, the communication line 3 exchanges data by ASCII character data.

FIG. 5 is a diagram showing a configuration of a second example of a data exchange system with a temperature controller, which uses an FA controller which also performs information processing. (A) shows a hardware configuration and (A) ) Indicates the software configuration. This example
As shown in (a), on the sequencer side, an AI (analog input) module, an AO (analog output) module,
A DI (digital input) module and a DO (digital output module) are provided in parallel, and as shown in (a), each is exclusively used for inputting and outputting a specific signal relating to the temperature controller.

[0005]

Among the above-mentioned conventional techniques, the one shown in FIG. 4 requires interface software with the temperature controller on the sequencer side. This interface software is a ladder program that is application software for operating a sequencer (simple, continuous execution of a series of instructions at the same level
Different from the one that realizes a predetermined operation), because it is written in a high-level language such as BASIC, the usage and handling will be large, which will impose a heavy burden on the user who is familiar with the sequencer. There is a problem.

Further, if the technique of FIG. 5 is used, the load on the ladder program is reduced, but a transmission error occurs in analog transmission, and if the number of temperature controllers connected to the sequencer is increased, the number of modules is increased by that amount and wiring is increased. There is a problem that the number also increases. The present invention has been made based on such consideration, and an object thereof is to easily and economically realize an interface between a device such as a temperature controller and a sequencer (FA controller). ..

[0007]

The outline of the typical one of the present invention is as follows. The PLC side has a serial interface for exchanging data with the temperature controller.
Multiple temperature controllers are connected to one serial interface. Further, this serial interface has a database corresponding to the temperature controllers for the number of connected units, and can be accessed from the sequencer side as an input relay and an output relay by a ladder program. Further, a database corresponding to the database of the sequencer is provided for each temperature controller of each channel, and this database and the database of the sequencer exchange data at regular intervals independently of the ladder program.

[0008]

In terms of hardware, a plurality of devices such as temperature controllers can be connected to one serial interface provided in the sequencer, the interface configuration is simplified, and the number of wires is reduced. Connection becomes easy. In terms of software, a database that supports both the sequencer side and the device side such as the temperature controller is provided, and the database transfer method with an independent cycle is adopted. By treating it as an access by the ladder program regarded as an input / output relay, the interface program in a high-level language becomes unnecessary.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of an embodiment of a data exchange mechanism (dedicated interface between a sequencer and a temperature controller) between an FA controller and a controlled object according to the present invention. The sequencer main body 20 has a serial interface 90 in addition to the CPU and I / O module. The serial interface 90 has a database 30.
And a transceiver 40. The transmitter 40 is connected to the n temperature controllers 50a to 5 through the communication line 100.
0n is connected. Each of the temperature controllers 50a to 50n has a transmission / reception unit 60, a database 70, and a control unit 80.

The sequencer main body 20 regards this as an access to an input / output relay and accesses the database 30 by a ladder program. On the temperature controllers 50a to 50n side, access to the database is controlled by the control unit 80. Further, the transmission / reception units 40 and 60 are designed to exchange databases at regular intervals independently of the ladder program of the sequencer.

FIG. 2 is a diagram showing the configuration of a more specific embodiment in which four temperature controllers are connected to the sequencer. The database 30 in the serial interface 90 for exchanging data with each temperature controller has a form corresponding to each temperature controller, and the data sucked up by the sequencer from each temperature controller is transferred to each channel (CH). Each) is treated as a 24-point input relay. The breakdown is that 12 points are treated as PV values, 12 points as status signals of the temperature controller, and 2 points among them are contact information (A1, A2) of alarms 1 and 2, in particular.

Further, from the sequencer 20, temperature controllers 50a ...
Data set to 50n for each channel (CH)
It is treated as an output relay of 24 points, of which 12 points are the RSP value, 12 points are the mode switching signal of the temperature controller, and one of them is RUN / RESET (R /
S) mode signal. Each temperature controller 50a-50n
Inside, there are databases 70a to 70d corresponding to the database 30 in the serial interface 90, and when the control units 80a to 80d execute control calculation in the temperature controller, those databases 70a to 70d.
You can freely access d.

When viewed from the serial interface 100 connecting the sequencer and the temperature controller, the sequencer serves as a master station and the temperature controller serves as a slave station, and the transmitter / receivers 40, 60a-60 are provided.
By the function of d, data is exchanged at a constant cycle independently of the ladder program on the sequencer side. The PV output device 100 of each channel (CH) is connected to the digital output module (DO) on the sequencer side, whereby the data sucked from the temperature controller can be displayed. In addition, the digital input module (DI),
Digital switch 1 for remote SP setting of each channel
10 is connected so that a control target value for the temperature controller can be set. The display on the PV display 100 and the setting of the SP value using the digital switch 110 are as follows.
This can be realized by executing the ladder program in steps 201 to 208 shown in FIG.

As described above, according to this embodiment, the PV, SP, alarm contact information and the like of the temperature controller can be exchanged by operating and referring to the internal relay by the ladder program from the sequencer.

[0015]

As described above, according to the present invention, the sequencer is provided with a serial interface capable of connecting a plurality of devices such as temperature controllers, and the devices such as temperature controllers and this interface are independent. The data transfer method of the cycle is adopted, and since it can be operated and referred to as an input relay and an output relay in the sequencer, the data in the temperature controller can be handled only by the ladder program in the sequencer. is there. Further, there is an effect that only one interface on the sequencer side is required and wiring is easy.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of an embodiment of a data exchange mechanism (dedicated interface between a sequencer and a temperature controller) between an FA controller and a controlled object of the present invention.

FIG. 2 is a diagram showing a configuration of a more specific embodiment in which four temperature controllers are connected to a sequencer.

FIG. 3 is a diagram showing an example of a ladder program for displaying on a PV display 100 and setting an SP value using a digital switch 110 in the embodiment of FIG.

FIG. 4 is a diagram showing a configuration of a first conventional example of a data exchange system with a temperature controller, which is developed by the applicant of the present application and uses an FA controller which also performs information processing; Indicates a hardware configuration, and (a) indicates a software configuration.

FIG. 5 is a diagram showing a configuration of a second conventional example of a data exchange system with a temperature controller using an FA controller that also performs information processing, where (A) shows a hardware configuration, and (A).
Indicates the software configuration.

[Explanation of symbols]

 20 Sequencer main body 30 Database 40, 60 Transmitter / receiver 50 Temperature controller 70 Database 80 Temperature controller controller 100 Communication line

Claims (1)

[Claims] 1. A FA controller (20) and this FA
A data exchange mechanism with a device (50) to be controlled by the controller, wherein the FA controller is a serial interface means (90) for exchanging data with the device to be controlled.
The device (50a to 50n) to be controlled (n is a natural number of 2 or more) (50a to 50n) is connected to the serial interface means (90) through the serial communication line (100). And n channels are formed by the connection, and the serial interface means (90) has a database (30) corresponding to the device to be controlled of each channel. The FA controller itself regards this database as a plurality of input relays or output relays provided for each channel, executes access by the ladder sequence, and inputs / outputs data to / from the database. On the other hand, the device to be controlled of each channel is connected to the serial interface of the FA controller. A database (70) for each channel for exchanging data with the database in the communication means, and an execution means (80) for accessing the database for each channel are provided, and further, a serial interface of the FA controller. The database (30) in the means and the database (70) for each channel in each device are designed to mutually exchange data independently of the ladder sequence of the FA controller main body. And F
A data exchange mechanism between the A controller and the controlled object.