JP2001084009A - Redundant process input/output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by surely executing the transfer of driving right to the stand-by side of a redundant process I/O device without generating an error even when the driving side is pulled out by a hot-line. SOLUTION: In the redundant process I/O device, hot-line maintaining signal terminals 16 are arranged near to terminals for inputting/outputting a process signal in each of connectors 11I, 11M, these terminals 16 are monitored by a microprocessor 911. At the time of judging that the driving side of the redundant process I/O device is pulled out by a hot-line, the processor 911 gives up the driving right and allows the stand-by side to succeed processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly reliable distributed control system, and more particularly to a duplex system for an input / output device that directly interfaces with a process.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional example of a distributed control system. In the figure, 1 is a man-machine interface device (MMI), 2 is a control LAN, and 31 to 3n are controllers. As shown in the figure, the distributed control system connects a plurality of distributed controllers (several tens in the case of a large scale) with controllers 31 to 3n via a control LAN 2, and connects one to several controllers. It is managed by the man-machine interface device 1.

FIG. 7 shows a configuration example of the controller shown in FIG. 7 is a control MPU, 5 is an IO link, 6
1 to 6n are process input devices (also called IO shelves)
It is. That is, the control MPU performs an operation for process control, and a plurality of (for example, 32) units are distributed and installed.
Exchanges data with the input device via the IO link. The input device is connected to 4-20mA transmitter and various sensors,
A / D conversion of the process signal of the field device is performed,
The digital amount which is the A / D conversion value is notified to the transmission control module.

[0004] Generally, a controller is required to have high reliability. FIG. 8 shows an example of high reliability of the controller. 4A and 4B in FIG. 8 are control MPUs, 5A and 5
B is an IO link, and 61 to 6n are input devices. That is, the control MPU and the IO link are duplicated, and the process input devices 61 to 6n are connected to the IO links 5A and 5B.

FIG. 9 shows an example of the configuration of an input device corresponding to a dual control MPU and IO link. 5A and 5B are IO
A link, 7A and 7B are transmission control modules, 8 is an IO bus, and 91 to 9n are input modules. The transmission control modules 7A and 7B interface with the IO links 5A and 5B and the IO bus 8, and relay data between a control MPU (not shown) and the input module. On the other hand, the input module directly interfaces with the process. In this example, the transmission control module is duplicated corresponding to the duplication of the control MPU and the IO link, and the transmission control module is switched corresponding to the switching of the operation / standby of the control MPU and the IO link. I have.

FIG. 10 shows a configuration example of an input device in which an input module and an IO bus are duplicated in addition to the transmission control module. Reference numeral 61 denotes an IO shelf, which has mounting slots for two transmission control modules 7A and 7B and 16 input modules, and one IO shelf accommodates 16 input devices. 8A and 8B are IO buses, and 91A and 91B to 98A and 98B are input modules. Here, slot numbers 00 and 01, 02 and 0
The input modules 91, 92... 98 of the same type are mounted on 3,. The pair of A and B has one working and one waiting,
Both are connected to the process. Input signals from the process are input to both the operation and the standby, and data transmission to the transmission control module is performed by both the operation and the standby.

FIG. 11 shows a configuration example of an IO shelf. In the figure, 9 is an input module, 10 is a motherboard, 11 is a connector, and 12 is a process terminal block. The motherboard 10 has various signal lines (lines) or terminals, 13 is a power signal line, 14 is a mounting slot number line, 15 is a process signal line, and a connector 11.
Is input to the input module 9 via That is, IO
The shelf has an integrated structure of a terminal block 12 to which a process signal is connected and the motherboard 10. The power supply signal line 13 and the signal lines 14 from the terminal block
Wiring such as the O bus 8 is provided, and the transmission control module and the IO
The module is connected to the motherboard via the connector. A process signal line 15 is connected to the terminal block by an instrumentation cable or the like.

[0008]

However, FIG.
When the active side of the duplicated input module is pulled out by a hot line (hot line out) in the configuration of (1), in order to prevent the fluctuation of the input data during the switching of the duplexing, when the active side is pulled out, for example, as shown in FIG. As described above, when the signal of the process signal line 15 connected to the process is dropped, the operating side must abandon the operating right.

However, in the case of FIG.
Since the signal from the power supply line 13 is still input to the input module even if the signal of No. 5 is dropped, there arises a problem that the operating module cannot give up the operating right. Also, the input module must be detachable with a hot wire, but for example, when the standby side input module is hot-plugged and the connector to the motherboard is not completely inserted, the standby side input module is activated. In spite of this, when the signal from the power supply line 13 is input, the operation is started, and there is a disadvantage that both of them are operated. Accordingly, it is an object of the present invention to improve the reliability by avoiding a malfunction when the active module is pulled out with a hot wire or the standby module is hot-plugged.

[0010]

According to the first aspect of the present invention, an input / output module is connected to a control MPU via an IO link, and the input / output module is controlled via an IO bus. A transmission control module, and an IO shelf having a terminal block and a motherboard to which a process signal is connected and accommodating the input / output module and the transmission control module, wherein the input / output module is provided in adjacent mounting slots of the IO shelf. In a redundant process input / output device in which one of the input / output module pairs is operated and the other is on standby, a terminal for live line maintenance is provided near a connector for inputting / outputting the process signal, If the monitoring of this terminal indicates that the active module has been pulled out in a live state, the active By taking over abandoned and the process to the standby side right, characterized by preventing the fluctuation of the input and output data in the switch.

According to a second aspect of the present invention, an input / output module, a transmission control module connected to a control MPU via an IO link, and controlling the input / output module via an IO bus, a terminal block to which a process signal is connected, and a motherboard And an IO shelf for accommodating the input / output module and the transmission control module. The input / output module is mounted in adjacent mounting slots of the IO shelf, and one of the input / output module pairs is operated, and the other is operated. In a redundant process input / output device that is duplexed as a standby, a terminal for hot wire maintenance is provided near a connector for inputting and outputting the process signal, and this terminal is monitored together with the number of the mounting slot, and the standby side is monitored. Detected that the state of this terminal and the number of the mounting slot did not change for a certain period of time during live insertion It allows, characterized in that to prevent the start-up malfunction during hot-line maintenance launch as a standby.

[0012]

FIG. 1 is a structural view showing an embodiment of the present invention, FIG. 2 is a structural sectional view showing an IO shelf used in FIG. 1, and FIG. FIG. 4 is a front view showing various connector terminals of the IO shelf used in FIG. That is, as is clear from FIGS. 2 and 4, the vicinity of the line or the terminal 15 for inputting the process signal of the connector 11 is provided.
It is characterized in that a line or terminal 16 for hot wire maintenance is provided. The terminal 16 is normally at an effective level (low level), and it is assumed that the input module 9 is securely connected to the motherboard 10 in this state. Note that this terminal 16
Is 0 V inside the motherboard 10 as shown in FIG.
, And is pulled up to 5 V inside the input module 9 as shown in FIG.

In FIG. 1, the connector on the motherboard side is connected to 11
M and the connector on the input module side are shown as 11I, respectively. The microprocessor 911 is connected to this terminal 1
For example, when the input module 9 is removed from the motherboard 10 as shown in FIG.
The microprocessor 911 determines that the active module has been pulled out in the live state because the terminal 16 changes from the valid level (low level) to the invalid level (high level). Then, the microprocessor 911 sets the MST
By making the C signal invalid (low level), the operating side relinquishes the operating right and takes over the processing to the standby side, thereby preventing fluctuation of input / output data during switching. Although FIG. 1 includes a JK flip-flop, various gates, a watchdog timer monitoring circuit, a reset pulse generation circuit, and the like, the description is omitted because it is not directly related to the present invention.

As described above, the hot-line maintenance line or terminal 16 provided near the line or terminal 15 for inputting the process signal of the connector 11 is also used when the standby side is hot-plugged. Can be. That is, this terminal is monitored by the microprocessor 911 together with the mounting slot number 14, and when it is detected that the state of this terminal (valid state) and the mounting slot number do not change for a fixed time (for example, one second), the corresponding MSTC If the signal is made valid (high level) and the M / S signal is confirmed to be low level, and then started up as a standby unit, it is possible to prevent the startup malfunction of conventional hot-line maintenance. It becomes possible.

The number of the mounting slot is represented by four terminals as shown in FIGS. 4 to 6, and the input module recognizes its own mounting slot number from the state of 1, 0 of each terminal, and recognizes this. The transmission control module 7A shown in FIG.
7B together with the input data. Since there are 0 to 15 mounting slots as in FIG.
Is expressed, for example, all four terminals are “0”, and when expressing the slot 15, for example, all four terminals are “1”. Although the input device has mainly been described above, the present invention can be similarly applied to the output device by simply reading “input” as “output”.

[0016]

According to the present invention, it is possible to prevent fluctuations in input / output data during switching even when the active module is pulled out with a hot wire, and even when the standby module is hot-plugged. Startup malfunction can be prevented,
Stable operation offers the advantage of further increased reliability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a structural sectional view showing an example of an IO shelf used in FIG.

FIG. 3 is an explanatory diagram illustrating a case where a module is attached and detached in FIG. 2;

FIG. 4 is a front view showing various connector terminals of the module used in FIG. 1;

FIG. 5 is an explanatory diagram of an applied voltage in the connection connector.

FIG. 6 is a schematic configuration diagram illustrating an example of a distributed control system.

FIG. 7 is a block diagram illustrating a configuration example of a controller.

FIG. 8 is a block diagram illustrating a configuration example of a redundant controller.

FIG. 9 is a block diagram illustrating an example of a process input device.

FIG. 10 is a block diagram showing another example of the process input device.

11 is a structural sectional view showing an example of an IO shelf used in FIG.

FIG. 12 is an explanatory diagram illustrating a case where a module is attached and detached in FIG. 11;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Man-machine interface device (MMI), 2 ... Control LAN, 31-3n ... Controller, 4 ... Control MP
U, 5 ... IO link, 61-6n ... Process input device (IO shelf), 7A, 7B ... Transmission control module,
8, 8A, 8B: IO bus, 9, 91 to 9n: Process input module, 10: Motherboard, 11: Connection connector, 12: Process terminal block, 13: Power supply terminal, 14
... Slot number terminal, 15 ... Process signal terminal, 1
6 Active maintenance terminal, 911 Microprocessor.

Claims (2)

[Claims] 1. An input / output module, a control MPU and an IO
A transmission control module that is connected by a link and controls the input / output module via an IO bus, and an IO shelf that has a terminal block and a motherboard to which a process signal is connected and houses the input / output module and the transmission control module. A redundant process input / output device comprising: an input / output module mounted in adjacent mounting slots of the IO shelf; one of the input / output module pairs is operated, and the other is in a standby state. Provide a hot-line maintenance terminal near the input / output connector.If monitoring of this terminal indicates that the active module has been pulled out in the hot-line state,
A redundant process input / output device wherein the operating side relinquishes the operating right and takes over the processing to the standby side, thereby preventing fluctuations in input / output data during switching. 2. An input / output module, a control MPU and an IO.
A transmission control module that is connected by a link and controls the input / output module via an IO bus, and an IO shelf that has a terminal block and a motherboard to which a process signal is connected and houses the input / output module and the transmission control module. A redundant process input / output device comprising: an input / output module mounted in adjacent mounting slots of the IO shelf; one of the input / output module pairs is operated, and the other is in a standby state. Provide a terminal for hot wire maintenance near the input / output connector, monitor this terminal together with the number of the mounting slot, and make sure that the state of this terminal and the number of the mounting slot do not change for a certain period of time when the standby side is hot-plugged. If a fault is detected, start up as a standby to prevent startup malfunctions during hot-line maintenance. And a redundant process input / output device.