JPH04174008A - Sequence controller with operation confirming function - Google Patents

Abstract

PURPOSE:To confirm a contact which changes in state at a glance by providing a processor which compares current and last state data with each other and detects the address of the contact having a change in opening/closing state and a ring buffer stored with the address of the detected contact and the state after the state change together with the time that a timer indicates. CONSTITUTION:The processor 10 reads state data indicating the opening/closing state of the contact out of an input/output module 1 and ORs the current state data exclusively with the last state data stored in an I/O memory 11 for comparative arithmetic to detect the address of the contact which has the change in opening/closing state. The ring buffer 14 is stored with the address of the contact having the change in the opening/closing state and the state of the contact after the state change together with the time that the timer indicates. A CPU 6 sends the data stored in the ring buffer 14 to a personal computer 9 through an interface 8 and displays a timer chart. Consequently, an operation history can be confirmed without omitting data and the contact having the state change can be confirmed at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sequence controller with an operation confirmation function that can confirm the operation history of various sensors, etc.

[Conventional technology]

FIG. 3 is a configuration diagram showing a conventional sequence controller with an operation check function. In the figure, 1 is an input/output module that inputs contacts in various sensors, outputs contacts to various sensors, etc., and 2 is an input/output module. 1 and the CPU 6 and between the input/output module 1 and the processor 3; 3 is a processor that reads status data indicating the open/close states of contacts of various sensors input to the input/output module 1; 4 is an interface when the processor 3 is in operation; RAM is the working memory used; 5 is an I10 table that stores state data read by the processor 3; 6 is a CPU that manages input/output of contacts; 7 is a memory that stores programs for the CPU 6, and A system memory 8 is a working memory used, 8 is an interface between the CPU 6 and a personal computer 9, and 9 is a personal computer that displays status data read by the processor 3 and indicating the open/closed status of the contacts.

Next, the operation will be explained.

Confirmation of the operation of contacts such as various sensors in a conventional sequence controller with an operation confirmation function is performed as follows.

At regular intervals, the processor 3 inputs state data indicating the open/closed states of the contacts from the input/output module 1 and writes the state data to the I10 table 5. Then, the CPU 6 sends the status data written in the I10 table 5 to the personal computer 9 via the interface 8 in response to a command from the personal computer 9, and displays it on the personal computer 9.

[Problem to be solved by the invention]

Conventional sequence controllers with an operation check function are configured as described above, so the amount of information increases as the operation is checked including contacts that do not change state, and it takes time to exchange data between the PC and CPU. In addition, there was a problem that contacts whose state changes earlier than the timing at which the personal computer reads the state data stored in the I10 table may be missed.

This invention was made to solve the above-mentioned problems. By storing only the contacts that have changed state along with the time, it is possible to check the operation history without missing any data, and - visually detect the change in state. The purpose of the present invention is to obtain a sequence controller with an operation confirmation function that can confirm which contacts are present.

[Means for Solving the Problems] A sequence controller with an operation check function according to the present invention uses a processor to read state data indicating the open/closed state of a contact, and compares the current state data with the previous state data. A device that calculates and detects the address of a contact whose open/closed state has changed, and stores in a ring buffer the address of the contact detected by the processor and the state after the state change of that contact, along with the time indicated by the timer. It is.

[Operation J] In the sequence controller with an operation confirmation function in this invention, the processor compares the current state data with the previous state data, detects the address of the contact whose open/closed state has changed, and stores it in the ring buffer. According to
The address of the contact whose open/closed state has changed and the state of the contact after the state change are stored together with the time indicated by the timer.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing a sequence controller with an operation check function according to an embodiment of the present invention. In the figure, the same reference numerals as those in the conventional system indicate the same or corresponding parts, and the explanation thereof will be omitted. 1o reads the status data indicating the open/close status of various sensors inputted to the input/output module 1, compares the current status data with the previous status data, and calculates the status of the contact whose open/close status has changed. A processor 11 detects an address, and after a comparison operation, a processor 1o stores the current status data for the next operation.
0 memory, 12 a mask table that stores specification data that specifies contacts to be monitored in the status data read by the processor 1o, 13 a timer, and 14 a processor 1o.
This is a ring buffer that stores the address of the contact point detected by , and the state after the state change of the contact point, together with the time indicated by the timer 13 .

Next, the operations of the contacts of the various sensors, which will be explained next, are confirmed as follows.

A certain period of time ago, the processor 10 reads the state data indicating the open/closed state of the contact from the input/output module 1, and performs an exclusive OR of the current state data and the previous state data stored in the I10 memory 11. Comparison operation ((current state data)■(previous state data))
Detect the address of the contact whose open/closed state has changed.

Then, in order to detect only the contacts that you want to monitor in the status data (to remove contacts that do not need to be monitored), the data after the above comparison operation and the specified data stored in the mask table 12 are logically combined. Compress the data by multiplying ((data after comparison operation) △ (specified data)).

Next, as a result of the above calculation in the processor 10, if there is a change in the state of the contact to be monitored, as shown in FIG. Write the address and the state of its contacts (for example, "7xQ10"
Write as follows (T indicates that the contact has risen, xQlo indicates the address of the contact). Here, in the ring buffer 14, when writing to the end of the memory is completed, the write pointer returns to the beginning of the memory, so that information can be left endlessly.

Then, in response to a command from the personal computer 9, the CPU 6 sends the data stored in the ring buffer 14 to the personal computer 9 via the interface 8, and displays a time chart on the personal computer 9 to confirm the long-term operation history with no omissions. It makes it possible.

In the above embodiment, the timer is provided independently, but the timer may be built in the processor 10 or the CPU 6.

〔Effect of the invention〕

As described above, according to the present invention, there is a processor that compares and calculates current state data and previous state data and detects the address of a contact whose open/closed state has changed, and the address of the contact detected by the processor. and a ring buffer that stores the state after the state change of the contact along with the time indicated by the timer, so only the contacts whose state has changed are stored in the ring buffer, and the -th point indicates the state change. This has the effect of not only making it possible to check the contact points, but also making it possible to check the long-term operation history without omissions.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a sequence controller with an operation check function according to an embodiment of the present invention, FIG. 2 is a block diagram showing a ring buffer of a sequence controller with an operation check function according to an embodiment of the invention, and FIG. 1 is a configuration diagram showing a conventional sequence controller with an operation confirmation function. 10 is a processor, 13 is a timer, and 14 is a ring buffer. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 2

Claims (1)

[Claims] A processor that reads status data indicating the open/closed status of the contact, compares and calculates the current status data with the previous status data, and detects the address of the contact whose open/closed status has changed; A sequence controller with an operation check function, which is equipped with a ring buffer that stores the address of a contact that has been changed and the state after the state of that contact has changed, together with the time indicated by a timer.