JPH06291750A - Multipoint programmable terminal equipment - Google Patents

Abstract

PURPOSE:To provide a terminal equipment capable of connecting the I/O signals of multipoints just by one equipment and also being operated by the conventional signal format of time division multiplex transmission. CONSTITUTION:This equipment is provided with a terminal interface block 10 and a sequencer 14 and the terminal interface block 10 is provided with a microprocessor MPU 1 for communication processings for storing data for plural channels, transmitting them for the respective channels and also processing control data and the microprocessor MPU 2 for data conversion for converting the data from the sequencer 14 to the data format of the time division multiplex transmission, sending them to the microprocessor MPU 1 for the communication processing and transferring the control data to the sequencer 14. The sequencer 14 is provided with plural I/O units 18 and a sequencer microprocessor MPU for transferring the data from the I/O units 18 to the microprocessor MPU 2 for the data conversion and also transferring the control data from the microprocessor MPU 2 for the data conversion to the I/O units 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a terminal device of a time division multiplex transmission system used for a control system or the like.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a configuration example of a control system using a conventional time division multiplex transmission system.
The central monitoring device 50 and a plurality of terminals 51 are connected by a time division multiplex signal line 52, and the terminals 51 are connected to a control target device (not shown). The central monitoring device 50 and the plurality of terminals 51 communicate with each other in a frame of transmission signals as shown in FIG. That is, from the central monitoring device 50, a communication mode pulse Dm indicating a communication mode (data polling / control data classification), an address pulse Da of the terminal device 51, and control data (ON / OFF command, set value, etc.) control data. The pulse Dc is transmitted. Then, the terminal device 51 of the address pulse Da returns a reply data pulse Dr which is reply data (ON / OFF state signal, alarm signal, temperature information, etc.) received from the control target device (not shown) ( Communication mode = data polling) or accepting a control data pulse Dc (communication mode = control data),
It is designed to be transferred to a control target device (not shown).
Then, when the series of processing is completed, the next frame of communication is started.

[0003]

However, since the amount of data that can be handled in one frame is limited in the format of the transmission signal as shown in FIG. 5, the terminal device 51 uses 1 I / O of the controlled device (not shown). Connected for each signal (input / output signal). Therefore, if the I / O signals are concentrated in one place, a large number of terminals 51 are concentrated, and there is a problem that an error in setting an address, a mismatch in the type of I / O signals, and the like are likely to occur.

The present invention has been made in view of the above circumstances, and one unit can combine I / O signals of multiple points,
Moreover, it is an object of the present invention to provide a terminal device (terminal device) that can be operated in the conventional signal format of time division multiplex transmission.

[0005]

A multipoint programmable terminal device according to the present invention, which is proposed to achieve the above object, is a programmable terminal device used in a control system in which a central monitoring device controls a plurality of controlled devices. A terminal interface block and a sequencer are provided, and in the terminal interface block, a signal coupling unit connected to the central monitoring unit by a time division multiplex signal line and a plurality of channels from a designated address number are provided. A communication processing microprocessor for accumulating reply data for each of the channels, performing multiplex transmission through the signal coupling unit for each channel, and processing control data from the central monitoring device;
A data conversion microprocessor for converting the data from the sequencer into a data format for time division multiplexing transmission and transferring the data to the communication processing microprocessor, and transferring the control data from the communication processing microprocessor to the sequencer. And the sequencer includes a plurality of I's for exchanging signals with the controlled device.
/ O unit and data from the plurality of I / O units and transfers the data to the data conversion microprocessor, and receives control data from the data conversion microprocessor to receive data from the plurality of I / O units. It is configured to include a sequencer microprocessor that transfers data to the relevant I / O unit.

[0006]

In the multipoint programmable terminal device according to the present invention, the terminal interface block and the sequencer are provided, and in the terminal interface block, the data conversion microprocessor uses the data format of the sequencer for time division multiplexing transmission. And the control data from the communication processing microprocessor is transferred to the sequencer. Further, the communication processing microprocessor accumulates reply data for a plurality of channels from the designated address number, multiplex-transmits the data for each channel through the signal coupling unit, and processes the control data from the central monitoring unit. And transfers it to the data conversion microprocessor. Therefore, it is possible to realize a multipoint programmable terminal device capable of combining multipoint I / O signals with one unit and operating in the conventional signal format of time division multiplexing transmission.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a configuration example of essential parts of an embodiment of a multipoint programmable terminal device according to the present invention. In the figure, reference numeral 10 is a terminal interface block, which stores reply data for a plurality of channels from a designated address number, a signal combining unit 12 connected to a central monitoring unit 11 by a time division multiplex signal line 52, and for each channel. The data from the communication processing microprocessor MPU1 for processing the control data from the central monitoring unit 11, the internal memory 13 of the communication processing microprocessor MPU1, and the sequencer 14 are time-divisionally multiplexed with the signal via the signal coupling unit 12. A data conversion microprocessor MPU2 and a data conversion microprocessor MPU2 which transfer the control data from the communication processing microprocessor MPU1 to the sequencer 14 while converting the data into a data format for multiplex transmission and transferring it to the communication processing microprocessor MPU1. Internal Li 15, a microprocessor for shared memory 16 and communicate with the sequencer 14 MPU 1
The address switch 17 is used to set the minimum address.

Reference numeral 18 denotes an I / O unit for exchanging signals with a device to be controlled, and MPU receives data from a plurality of I / O units 18 and transfers it to a data conversion microprocessor MPU2 and at the same time, for data conversion. Receiving the control data from the microprocessor MPU2,
A sequencer microprocessor to be transferred to the O unit 18, 19 is an internal memory of the sequencer microprocessor MPU, and these units configure the sequencer 14.

FIG. 2 is a diagram showing a schematic configuration example of a time division multiplex transmission system using such a multipoint programmable terminal device 20. The operation of each unit of the multipoint programmable terminal device 20 as described above will be described below. The sequencer microprocessor MPU has a unit-slot number of the sequencer 14 (= I / O counted from the CPU unit).
I connected to the position number where the O unit is mounted)
The type of the / O unit (digital / analog, input / output, points, etc.) is recognized, and this connection information is notified to the data conversion microprocessor MPU2 of the terminal interface block 10.

I / O signals (input / output signals) of controlled equipment (not shown) are input / output to / from each I / O unit 18. In the internal memory 19 of the sequencer microprocessor MPU, the storage position (slot) for each I / O unit 18 is predetermined. Therefore, each I / O signal of the control target device (not shown) is stored in a predetermined storage position (slot) of the internal memory 19 by the sequencer microprocessor MPU (at the time of input signal), or the internal memory 19 Is taken out from a predetermined storage position (slot) of (at the time of an output signal) and set in a predetermined I / O unit 18.

The data conversion microprocessor MPU2 of the terminal interface block 10 is notified from the sequencer microprocessor MPU of the connection information of the I / O unit 18 connected to the unit-slot number of the sequencer 14 as described above. , What I in the internal memory 19 of the sequencer microprocessor MPU
It is possible to judge whether the / O signal is arranged. Therefore, the data conversion microprocessor MPU2 takes out the I signal (input signal) in the internal memory 19 through the shared memory 16 by data processing with the sequencer microprocessor MPU, and outputs it to its own internal memory 15 at a constant cycle. Writing is always done.

Data conversion microprocessor MPU2
Converts the I signal written and accumulated in the internal memory 15 into a data format (data unit) (Dr of FIG. 5) of the data format of time division multiplex transmission (FIG. 5),
Internal memory 1 of communication processing microprocessor MPU1
3 to a predetermined channel. For example, if the data amount of one frame (the number of bits of Dr) of the data format shown in FIG. 5 is 4 bits, one 16-point input D
1 captured from the I (digital input) unit
The 6-bit ON / OFF state signal is decomposed into four channels and set in the communication processing microprocessor MPU1. By doing so, it becomes possible to handle signals from the 16-point input DI unit in the conventional data format (FIG. 5).

In the case of an AI (analog input) signal, if the measurement range is, for example, 0 to 4000, it is not possible to reply in one transmission frame. (Without) is used as the digit designation of the numerical value (example: control data = 1
, The first digit when the control data = 2, the second digit when the control data = 2, etc.) are used and 4 frames are spent to return one point of analog information. Therefore, the communication processing microprocessor MPU1 secures a byte capacity for the number of digits for one communication channel.

Data conversion microprocessor MPU2
Knows what kind of control data has been transmitted from the communication processing microprocessor MPU1 to what channel of the address, reads the control data from the communication processing microprocessor MPU1, and uses the internal memory of the sequencer microprocessor MPU. Writing is performed in 19 predetermined storage positions (slots). The sequencer microprocessor MPU takes out the control data written in the internal memory 19 and sets it in a predetermined I / O unit 18.

Microprocessor MPU1 for communication processing
Monitors the transmission frame on the time division multiplex signal line 52, and whether the address pulse Da (FIG. 5) coincides with any of its own addresses from the k channel set by the address switch 17 to the address n. To judge.
Then, if they match, the communication mode pulse Dm (FIG. 5)
Is in the polling mode, the reply data stored in the channel is put on the reply data pulse Dr and sent back to the central monitoring unit 11. When the communication mode pulse Dm is control data, this is notified to the data conversion microprocessor MPU2.

FIG. 3 shows a unit of the sequencer 14 shown in FIG.
The type of the I / O unit 18 connected to the slot numbers (= position numbers where the I / O unit 18 is mounted counting from the CPU unit) 1, 2 and 3 are Di-16 points (digital input 16 points). , Do-16 points (digital output 16 points) and Ai-4 points (analog input 4 points).

In FIG. 3, the sequencer microprocessor MPU recognizes which type of I / O unit 18 is connected to which slot in the internal memory 19 and periodically updates each data in the internal memory 19 (program Cycle). The data is processed in units of words (16 bits in this case). The data conversion microprocessor MPU2 is a sequencer microprocessor M.
Information about which type of I / O unit 18 is connected to which slot in the internal memory 19 is received from the PU. Then, since a Di-16-point unit is connected to one slot, the data of the 0-word address of the internal memory 19 is read and divided into four channels,
Internal memory 1 of communication processing microprocessor MPU1
3 polling area 13 '(x0-3, x4-7, x8
-B, xC-F). (0 to F are hexadecimal numbers)
Further, since the analog unit of Ai-4 points is connected to the 3 slots, the data conversion microprocessor MPU2 first reads the data of the 3 word address,
Digit data (amount that can be transmitted in one transmission frame)
And is set in the polling area 13 '(Ai-1) of the internal memory 13 of the communication processing microprocessor MPU1. Next, the data at the addresses of 4, 5, and 6 words are sequentially read and similarly divided into digit data, and the polling area 13 '(Ai-2, Ai-3,
Ai-4).

On the other hand, when the control data of the k + 6 channel is set from the central monitoring unit 11, the data conversion microprocessor MPU2 uses the control data as y4-7 bits (output 4-7 port) as sequencer data. ), The data in the 1-word address of the internal memory 19 of the sequencer microprocessor MPU is rewritten by this control data.

Microprocessor MPU1 for communication processing
Monitors the transmission frame on the time-division multiplexed signal line 52 to determine whether the address pulse Da (FIG. 5) matches any of its own addresses. If they match, the communication mode pulse Dm (FIG. When 5) is in the polling mode, the reply data stored in the channel is put on the reply data pulse Dr and sent back to the central monitoring unit. When the communication mode pulse Dm is control data, this is notified to the data conversion microprocessor MPU2.

When viewed from the central monitoring apparatus 11, the above-mentioned connection is such that channels k to k + 3 are Di (digital input) terminals, channels k + 4 to k + 7 are Do (digital output) terminals. Ai (analog input) terminals are connected to k + 8 to k + 11, respectively.

[0021]

According to the multipoint programmable terminal device of the present invention, one unit can combine multipoint I / O signals and can operate in the conventional signal format of time division multiplexing transmission. Therefore, the conventional central monitoring device can be used. Also, because it is combined with the existing sequencer,
AND / OR logic data can be easily created, and additional changes of I / O signals can be easily made by additional replacement of I / O units.

[Brief description of drawings]

FIG. 1 is a configuration example diagram of a multipoint programmable terminal device according to the present invention.

FIG. 2 is a configuration example diagram of a control system using the multipoint programmable terminal device of FIG.

FIG. 3 is a diagram for explaining the operation of the multipoint programmable terminal device of FIG.

FIG. 4 is a diagram showing a configuration example of a conventional control system.

FIG. 5 is a diagram showing a data format of time division multiplex transmission.

[Explanation of symbols]

10 ... Terminal Interface Block 11 ... Central Monitoring Device 12 ... Signal Coupling Unit 13 ... Internal Memory of Communication Processing Microprocessor 14 ... Sequencer 15 ... Internal Memory of Data Conversion Microprocessor 17 ... Address switch 18 ... I / O unit 19 ... Sequencer microprocessor internal memory 20 ... Multipoint programmable terminal device 52 ... Time division multiplexed signal line MPU ... Sequencer microprocessor MPU1 ... Microprocessor for communication processing MPU2 ... Microprocessor for data conversion

Claims (1)

[Claims] 1. A central monitoring device is a programmable terminal device used in a control system for controlling a plurality of controlled devices, comprising a terminal interface block and a sequencer, wherein the terminal interface block has the central part. A signal combining unit connected to the monitoring device by a time division multiplex signal line, reply data for a plurality of channels is accumulated from a designated address number, and multiple transmission is performed for each channel through the signal combining unit, and the central portion is also provided. A communication processing microprocessor that processes control data from a monitoring device, and data from the sequencer is converted into a data format for time division multiplex transmission and transferred to the communication processing microprocessor, and the communication processing microprocessor For data conversion that transfers control data from the The sequencer includes a plurality of I / O units for exchanging signals with the control target device, and data from the plurality of I / O units for transfer to the data conversion microprocessor. In addition, the control data from the data conversion microprocessor is received and the plurality of I / Os are received.
A multipoint programmable terminal device comprising a sequencer microprocessor for transferring to the I / O unit of the units.