JP2001282317A - Plc device in which io setting is variable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PLC device in which IO setting is variable by changing IO setting without changing the OS of the PLC device. SOLUTION: This PLC device 10 is provided with an IO table storage part 11 for storing an IO corresponding table for defining the correspondence of a physical address to a logical address, an IO module 12 for inputting and outputting a signal, and an inputting and outputting part 13 for transmitting and receiving a signal with the IO module 12 and allocating the physical address to the IO module 12. In this case, an IO access part 14 is connected to the IO table storage part 11 so that the IO corresponding table stored in the IO corresponding table storage part 11 can be referred to. A PLC main body part 15 executes prescribed processing cooperatively with the IO access part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an IO setting variable P
The present invention relates to an LC device, and more particularly to a variable IO setting PLC device capable of changing IO settings without changing the OS of the PLC device.

[0002]

2. Description of the Related Art Conventionally, an IO access routine in a PLC device is directly described in an OS of the PLC device.
For example, 16 points of physical address 0x1000 are
It is assigned to the logical addresses X000 to X00F.

[0003]

Due to a minor hardware change, for example, a physical address 0x200
The 16 addresses at address 0 are logical addresses X000 to X00F
To be assigned to
It is necessary to change the OS of the LC device to change the correspondence of the assignment described in the OS.

[0004] The present invention has been made in view of such a point, and without changing the OS of the PLC device, the I / O
It is an object of the present invention to provide an IO setting variable PLC device capable of changing the O setting.

[0005]

According to the present invention, there is provided an IO table storage section for storing an IO correspondence table for defining a correspondence between a physical address and a logical address, and an I / O table for inputting and outputting signals.
An O module, an input / output unit that transmits and receives signals to and from the IO module, and allocates a physical address to the IO module; and an IO table storage unit,
An IO setting comprising: an IO access unit that refers to an IO correspondence table stored in the IO correspondence table storage unit; and a PLC main unit that executes a predetermined process in cooperation with the IO access unit. It is a variable PLC device.

According to the present invention, the IO table storage unit stores an IO correspondence table that defines the correspondence between physical addresses and logical addresses, and the IO access unit stores the IO correspondence table.
Since the configuration is such that the correspondence table is referred to, the IO setting can be changed without changing the OS of the PLC device by changing the IO correspondence table in the IO table storage unit.

[0007] Preferably, an IO table correction unit for correcting the IO correspondence table stored in the IO table storage unit is connected to the IO table storage unit.

Alternatively, preferably, the IO table stored in the IO table storage section is stored in the IO table storage section.
An IO table correction unit for correcting the correspondence table can be connected.

Preferably, the IO table storage section is set in a rewritable second memory area other than the first memory area in which the OS of the PLC main body is stored.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a PL according to an embodiment of the present invention.
It is a block diagram which shows C apparatus. As shown in FIG. 1, a variable IO setting PLC device 10 of the present embodiment includes an IO table storage unit 11 that stores an IO correspondence table 11t that defines a correspondence between a physical address and a logical address, The IO module 12 transmits / receives signals to / from the IO module 12, and transmits a physical address to the IO module 12.
An input / output unit 13 assigned to the module 12.

An IO access unit 14 is connected to the IO table storage unit 11 and the input / output unit 13 and refers to an IO correspondence table 11t stored in the IO correspondence table storage unit 11.

The PLC main unit 15 executes a predetermined process for the input / output unit 13 in cooperation with the IO access unit 14, for example.

FIG. 2 shows a specific example of the IO correspondence table.
As shown in FIG. 2, it is preferable that the BIT position and the ON / OFF polarity are also converted in association with the logical address and the physical address.

Next, the operation of the present embodiment will be described.

When the PLC device 10 executes a predetermined process, the PLC body 15 operates to execute a user program or the like. In this process, a logical address described in a user program or the like is interpreted by the PLC main unit 15.

The PLC main unit 15 includes an IO access unit 14.
The physical address corresponding to the interpreted logical address is stored in the IO correspondence table storage unit 11 in cooperation with
Reference is made from the correspondence table 11t. Then, the input / output unit 1
3, a signal is transmitted / received to / from the IO module 12 assigned to the referenced physical address.

According to the present embodiment, by changing the IO correspondence table 11t of the IO table storage 11, the IO of the PLC body 15 can be changed without changing the OS.
Settings can be easily changed.

As shown in FIG. 1, it is possible to change the IO correspondence table 11t of the IO table storage unit 11 by connecting a personal computer 20 or the like as a peripheral device to the IO table storage unit 11. In this case, the personal computer 20 functions as an IO table correction unit for correcting the IO correspondence table stored in the IO table storage unit 11.

Such an IO table correction unit may be constantly connected to the IO table storage unit 11, or may be connected to the IO table storage unit 11 only when necessary. The IO table storage unit 11
It is preferable that the memory is set in a rewritable memory area (second memory area) other than the memory area (first memory area) in which the OS of the PLC main body 15 is stored.

[0021]

According to the present invention, the IO table storage unit defines an IO that defines a correspondence between a physical address and a logical address.
The IO access unit stores the correspondence table.
Because it is configured to refer to the O correspondence table, IO
By changing the IO correspondence table in the table storage unit, the IO settings can be changed without changing the OS of the PLC device.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a PLC device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of an IO table.

[Explanation of symbols]

 Reference Signs List 10 PLC device 11 IO table storage unit 12 IO module 13 Input / output unit 14 IO access unit 15 PLC main unit 20 PC

Claims (4)

[Claims] An I / O table storage unit for storing an I / O correspondence table for defining a correspondence between a physical address and a logical address; an I / O module for inputting / outputting a signal; And an I / O unit that is connected to the IO table storage unit and refers to an IO correspondence table stored in the IO correspondence table storage unit.
An O access unit, and a P that executes a predetermined process in cooperation with the IO access unit.
An IO setting variable PLC device comprising: an LC main body. 2. The IO table storage unit according to claim 1, wherein an IO table correction unit for correcting an IO correspondence table stored in the IO table storage unit is connected to the IO table storage unit. PLC device with variable IO settings. 3. The IO table storage unit according to claim 1, wherein an IO table correction unit for correcting an IO correspondence table stored in the IO table storage unit can be connected to the IO table storage unit. PLC device with variable IO settings. 4. The I / O table storage section is set in a rewritable second memory area other than the first memory area in which an OS of a PLC main body is stored. 3. The PLC device with variable IO settings according to 1.).