JP2736114B2 - Area allocation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to an area allocating device that allocates each memory area used for transmission to each transmission device of a programmable controller, for example.

(Prior Art) When transmission is performed by connecting each transmission device to a programmable controller, each area of the internal memory of the programmable controller is allocated to these transmission devices. In this case, the input / output register of each transmission device is allocated, and when the memory area is allocated to each transmission device, the address of each memory area is set. As described above, there is a lot of information which cannot be set without knowing the internal details of the transmission device when allocating the memory area to each transmission device. For this reason, the work of allocating the memory area takes a long time, and may be erroneously set.

Further, when the transmission devices of different types are mounted, it is necessary to prevent the addresses of these memory areas from overlapping or the like, which complicates the allocation of the memory areas.

(Problems to be Solved by the Invention) As described above, the allocation of the memory area is complicated and may be set incorrectly.

Therefore, an object of the present invention is to provide an area allocating device that can automatically allocate a memory area to each transmission device.

[Configuration of the Invention] (Means for Solving the Problems) The present invention is directed to assigning each memory area used for transmission to an internal memory to each transmission device connected to a central processing unit of a programmable controller. System setting means for setting information including the type of each transmission device and the number of words to be allocated, and the type and number of words for each transmission device and the like set by the system setting means when the central processing unit is started up. Is read, and the memory area of each transmission device is sequentially allocated to the internal memory according to the preset priority order of each transmission device, and when the transmission device is allocated to the memory area of the internal memory, It is determined whether the memory area has already been allocated to the blocked memory area. When-overlap is the area allocation apparatus characterized by comprising a allocation means for performing the allocation in accordance with priority.

(Operation) With the provision of such means, at the time of activation of the programmable controller, the type of each transmission device, the number of allocated words, and the like are set by the system setting means.
By reading the set number of words to be allocated to each transmission device, the allocating means sequentially allocates each memory area according to the priority of each transmission device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram when a transmission device is mounted on a programmable controller. This system is
A unit (UNIT0) 1 for a CPU (central processing unit), a unit (UNIT1) 2 for system expansion, and a programming device 3 are interconnected. Unit 1
Is provided with a CPU (Central Processing Unit) 4 to which two large-capacity transmission devices (STN1, STN2) 5, 6 are connected. The unit 1 has an internal memory and a memory for storing an allocation program. The transmission devices 5 and 6 are optional. On the other hand, unit 2 has each I / O (input / output) port 7-1
2 and two small-capacity transmission devices 13 and 14 are connected.

The programming device 3 has a function as a system setting means for setting the type of each of the transmission devices 5, 6, 13, 14 and the number of allocated words. The programming device 3 is provided with a CRT display device, and the set contents are displayed on the CRT display device.

The CPU 4 executes the assignment program to read the number of words to be assigned to each of the transmission devices 5, 6, 13, and 14 according to a preset priority, and to sequentially assign each memory area of each of the transmission devices to the internal memory. It becomes what has.

Next, the allocation operation at the time of starting the system configured as described above will be described with reference to the allocation flowchart shown in FIG.

In the programming device 3, each transmission device 5, 6, 13, 14
Is set. FIG. 3 shows a screen of the CRT display device when the setting operation of the number of words in the programming device 3 is completed. In the figure, the slot (SL
OT) indicates the mounting position of each transmission device 5, 6, 13, 14 and each I / O port 7-12 in each unit 1, 2, and OPT indicates that it is optional. [X 01W] is an input device for inputting one word, [Y 02W] is an output device for outputting two words, and [Z 16W] is a transmission device for 16 words.
Therefore, the optional transmission devices 5 and 6 are mounted on the slots (01) and (03) of the unit 1, respectively.
Transmission devices 13 and 14 are mounted in the slots (04) and (05), respectively.

When the setting in the programming device 3 is completed in this way, the CPU 4 reads the setting information of each of the transmission devices 5, 6, 13, and 14 at step s1, that is, the status indicating normal / abnormal and the number of allocated words. In this case, the CPU 4 controls the transmission devices 5, 6, 1
It is read from the setting information of, for example, the transmission device 13 having the highest priority among 3,14. Here, if there is an abnormal transmission device from the setting information, the transmission device is not allocated. Then CP
U4, in step S2, takes out the setting information of the transmission device read in step S1 according to the priority, determines whether there is an allocation request in the area of the internal memory to be allocated, and if there is this request, in step s3 It is determined from the assignment information table whether this area has already been assigned. If the allocation has not been performed, the CPU 4 proceeds to step s4 and allocates the memory area 16 of the transmission device 13 in the internal memory to the number of words to be allocated in the internal memory as shown in FIG. Word setting) Reserve. Next, in step s5, the CPU 4 updates the address of the allocation information table in which the number of words, the talker, the listener, and the like of each transmission device are set, and determines whether the allocation is completed in the next step s6. Therefore, if the allocation has not been completed, the CPU 4 returns to step s2 again and allocates a memory area to the next order, for example, the transmission device 14 according to the priority order. This assignment is performed by executing steps s2 to s4 in the same manner as the assignment of the transmission device 13. Here, in allocating the memory area of the large-capacity transmission devices 5 and 6 to the internal memory, if there is no overlap with the memory area of the previously allocated transmission device, the priority order of each transmission device is determined. Are assigned according to the following. When the allocation is performed in this way, as shown in FIG. 4, each of the memory areas 16, 17, 1 of the transmission devices 5, 6, 13, 14
8,19 are secured. In the case of a large capacity such as each of the transmission devices 5 and 6, in order to share the internal memory, the memory area of the internal memory is divided into blocks, and use prohibition / permission is set for each block and each memory area is set. Are prevented from overlapping.

As described above, in the above-described embodiment, the type and the number of allocated words of each transmission device are set, and the number of words to be allocated and the like of each transmission device are read in accordance with a preset priority, and each memory area of each transmission device is read. Each memory area 16,1 of various transmission devices 5,6,13,14
7, 18, and 19 can be easily assigned without judging the address. Therefore, it is possible to easily and quickly allocate the memory area of each transmission device, and to eliminate erroneous determination.

The present invention is not limited to the above-described embodiment, and may be modified without departing from the gist thereof.

[Effects of the Invention] As described above, according to the present invention, when the central processing unit is activated, each memory area is sequentially allocated to each transmission device according to a preset priority order of each transmission device, and the allocation is overlapped. In this case, the assignment is performed according to the priority order, so that important data can be transmitted quickly and controllability can be improved.

[Brief description of the drawings]

1 to 4 are diagrams for explaining an embodiment of an area allocating device according to the present invention. FIG. 1 is a configuration diagram when applied to a transmission device of a programmable controller, and FIG. FIG. 3 is a diagram showing a display example of each information set by the programmable device, and FIG. 4 is a schematic diagram showing an allocation state of a memory area. 1,2 ... unit, 3 ... programming device, 4 ... C
PU, 5, 6, 13, 14 ... transmission device, 7 to 12 ... I / O port.

Claims (1)

(57) [Claims] 1. An area allocating device for allocating each memory area used for transmission to an internal memory to each transmission device or the like connected to a central processing unit of a programmable controller, wherein the type of each transmission device and System setting means for setting information including the number of words to be allocated, and at the time of starting the central processing unit, read information including the type and the number of words to be allocated of each of the transmission devices set by the system setting means, and set in advance. The memory area of each transmission device is sequentially allocated to the internal memory according to the priority order of each transmission device, and when a large-capacity transmission device is allocated to the memory area of the internal memory, the internal memory is divided into blocks. Memory area
Allocation means for determining whether or not the memory area has already been allocated, and executing allocation in accordance with the priority when the allocation is overlapped, and an allocation means.