JP2004310592A - Logging processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable logging without stopping a logging device and a leak of device data. <P>SOLUTION: The logging processor is equipped with a PLC 20 having a temporary memory in the form of ring buffer where the device data 24 of a function block 21 are logged, and a personal computer 10 which has a program part 12 and a memory part 11, is electrically connected to the PLC 20, and stores the logging data from the temporary memory 25 in the memory part 11. While the temporary memory 25 is outputting logging data of a specified size to the memory part 11 all together, it logs new device data from the function block 21 in a second area other than a first area which stores the data of the specified size, and logs in the second area so as not to overwrite the new device data which has been logged earlier by new data to be logged later. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a logging processing device, and more particularly to a logging processing device that repeatedly performs a process of collectively reading logging data.
[0002]
[Prior art]
Conventionally, in a logging processing device (data transmission system) in which a receiving-side data communication terminal device such as a personal computer and a transmitting-side data communication terminal device such as a PLC (Programmable Logic Controller) are connected via a network or the like, a receiving-side data communication terminal device or the like is used. Since the time required for data transmission between the transmitting-side data communication terminals is slower than the program execution cycle in the transmitting-side data communication terminal, all changes in device data in the transmitting-side data communication terminal can be changed. Could not be read. For this reason, there has been a problem in that logging (discharge processing) data from the transmitting data communication device to the receiving data communication device is leaked.
[0003]
Therefore, in a logging processing device (communication data recording device) described in Patent Document 1, device data in a PLC (computer main body) to be logged is stored in a temporary memory (cyclic buffer) provided in the PLC, and a failure occurs. When the logging data reaches a predetermined number only when the error occurs, the logging data when the failure occurs is output to a memory (external storage device) in the receiving data terminal device and recorded.
[0004]
[Patent Document 1]
JP-A-3-235454 (pages 3 and 4)
[0005]
[Problems to be solved by the invention]
However, in the logging processing device described in Patent Document 1, while logging data reaching a predetermined number is output to a memory in the receiving data communication terminal device and recorded, the logging data is temporarily received by the logging data in the memory. A new logging process needs to be temporarily interrupted in the PLC so that the logging data that has not yet been output to the memory in the side data terminal device is overwritten by the new logging data and is not deleted. For this reason, there was a problem that logging data was leaked.
[0006]
The present invention has been made in view of the above, and an object of the present invention is to provide a logging processing device that logs device data without stopping the logging processing device without omission.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, in a logging processing device according to the present invention, a function block in which a circuit block repeatedly used in a sequence program is made into parts and device data of the function block are logged. A PLC having a first memory unit in a ring buffer format, and a program unit, a second memory unit, and an input unit for inputting logging conditions. And a receiving data communication terminal device for storing the logging data from the first memory unit in the memory unit of the first embodiment, wherein the first memory unit stores the logging data of a predetermined size in the second memory unit. While outputting the data collectively, a second area other than the first area storing the data of the predetermined size is used. The logging new device data from the function block, and wherein the logging to said second region so as not to overwrite the new device data logging after the new device data logging previously.
[0008]
According to the present invention, while the logging data of the predetermined size stored in the first area of the first memory unit is collectively output to the second memory unit, the data other than the first area of the first memory unit is output. Since the size sufficient to log new device data in the second area is calculated, logging data that is not output to the second memory unit is not overwritten by new logging data.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a logging device according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by the embodiment. An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a logging device according to an embodiment of the present invention.
[0010]
The logging device is configured by directly connecting a receiving-side data communication terminal device including the personal computer 10 and a PLC (Programmable Logic Controller) 20 or by connecting them via a network.
[0011]
The PLC 20 includes a function block (hereinafter, referred to as FB) 21, a temporary memory 25, a read completion flag 22, and a read permission flag 23.
[0012]
The FB 21 is a component of a circuit block that is repeatedly used in the sequence program, and turns on the read permission flag 23 after N device data 24, which will be described later, is logged in the temporary memory 25.
[0013]
The temporary memory 25 logs the device data of the FB 21 in a ring buffer (circulating buffer) format. When the logging data (logged device data) reaches a predetermined N number of items to be described later, the temporary memory 25 collectively collects the data. The data is read (output) by the memory unit 11 of the computer 10. Also, while the memory unit 11 is reading the logging data of the temporary memory 25, the temporary memory 25 uses the area of the memory area of the temporary memory 25 other than the area used for the N pieces of logging data to store the data of the FB 21. Log device data.
[0014]
The read completion flag 22 is a device that turns on the flag in response to an instruction from the program unit 12 in the personal computer 10 after the memory unit 11 in the personal computer 10 completes reading the logging data from the temporary memory 25. The flag is turned off immediately before the memory unit 11 reads out the N pieces of logging data from the temporary memory 25, and the memory unit 11 starts reading the logging data from the temporary memory 25. Therefore, the read completion flag is turned off only when the memory unit 11 is reading the logging data from the temporary memory 25, and is turned on otherwise.
[0015]
The read permission flag 23 is a device that is turned on by the FB 21 when the device data logged in the temporary memory 25 reaches a predetermined number, and transmits this to the program unit 12 of the personal computer 10. After the memory unit 11 finishes reading the logging data from the temporary memory 25, the program unit 12 transmits an instruction to the PLC 20 to turn off the flag.
[0016]
The personal computer 10 includes an input unit including a memory unit 11, a program unit 12, and, for example, logging condition setting screens 13 to 16. The memory unit 11 collectively reads and stores predetermined N pieces of logging data stored in the temporary memory 25 of the PLC 20. The program section 12 receives the read permission of the temporary memory 25 transmitted from the read permission flag 23 of the PLC 20, and causes the memory section 11 to read the logging data of the temporary memory 25. In addition, when the memory unit 11 completes reading the predetermined number of pieces of logging data from the temporary memory 25, the program unit 12 transmits the completion of the reading to the PLC 20. The logging condition setting screens 13 to 16 are screens for inputting the logging conditions determined by the user, and the program unit 12 performs predetermined N calculations based on the input logging conditions.
[0017]
A logging processing method according to the present embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing a part of the logging processing method according to the embodiment of the present invention. Before performing the logging process, the user sets logging conditions using the logging condition setting screens 13 to 16 provided in the personal computer 10 (step S100).
[0018]
FIG. 3 is a diagram showing an example of a logging condition setting screen for inputting logging conditions according to the embodiment of the present invention. FIGS. 3A and 3B are diagrams schematically showing a logging condition setting screen when a personal computer and a PLC are directly connected. The user sets the type of communication port required between the personal computer 10 and the PLC 20 and the type of required logging device on the logging condition setting screen 13 shown in FIG. Here, a case where the connection unit for communication between the personal computer 10 and the PLC 20 is set to COM1 is shown, and a case where the type of a logging device to be logged is set to D100 is shown.
[0019]
Next, the communication speed between the memory unit 11 of the personal computer 10 and the temporary memory 25 of the PLC 20 and the time interval at which the temporary memory 25 logs device data of the FB 21 are shown on the logging condition setting screen 14 shown in FIG. A logging interval, a single logging data size indicating the size of data to be logged once from the FB 21 by the temporary memory 25, and a total temporary memory size indicating a data size that can be stored in the temporary memory 25 are set. Here, a case is shown where the communication speed is set to 9600 bps, the logging interval is set to 1000 ms, the logging data memory size for one time is set to 2 bytes, and the total temporary memory size is set to 1024 bytes. As described above, since the communication speed can be freely set, even when the network medium of the personal computer 10 and the PLC 20 is changed, the optimum logging condition is set by changing the communication speed setting. It becomes possible.
[0020]
FIGS. 3C and 3D are diagrams schematically showing a logging condition setting screen when the personal computer and the PLC are connected via a network in which the communication speed changes. The user sets an IP address indicating a number for identifying the PLC 20 on the network and the above-described logging device on the logging condition setting screen 15 shown in FIG. Here, a case is shown where the number for identifying the PLC 20 on the network is 10.97.29.99.
[0021]
Furthermore, the communication speed set on the logging condition setting screen 16 shown in FIG. 3D is different from the communication speed set on the logging condition setting screen 14, and the memory unit 11 of the personal computer 10 stores the communication speed from the temporary memory 25 of the PLC 20. The time taken to actually read the logging data and the size of the actually read logging data are measured one or more times, the communication speed is calculated each time, and the communication speed is determined by the average value of the calculated communication speeds. Here, a case where the average value of the communication speed is 1.78 Mbps is shown. As described above, even in the logging process in an environment in which the communication speed changes, if the communication speed changes, the communication speed, the logging interval, the logging data size at one time, and the total temporary memory size are re-entered. Optimum logging conditions can be obtained.
[0022]
Next, based on the logging conditions set in step S100, when the number of pieces of logging data stored in temporary memory 25 is reached, memory unit 11 of personal computer 10 should read logging data from temporary memory 25 of PLC 20. Or the program unit 12 calculates and transmits the calculation result to the FB 21 of the PLC 20 (step S110). Thereafter, an internal device (not shown) used by the FB 21 of the PLC 20 as a flag for starting logging is turned on, and the logging process is started.
[0023]
Here, a description will be given of a method of calculating the optimum number of logging data (hereinafter, referred to as the number of reading of logging data) N, which is collectively read from the temporary memory 25 of the PLC 20 by the memory unit 11 of the personal computer 10. While the memory unit 11 is reading the logging data in the temporary memory 25, the logging data is read from the temporary memory 25 before the device data to be newly logged from the FB 21 is read into the memory unit 11 while the memory unit 11 is reading the logging data from the temporary memory 25. It is calculated on the condition that data is not overwritten. Assuming that the size of the logging data at one time is Qbyte and the number of readings of the logging data is N (N is a natural number), the logging data that the memory unit 11 of the personal computer 10 collectively reads from the temporary memory 25 of the PLC 20 is (Q × N). byte. When the total temporary memory size of the entire memory area of the temporary memory 25 is Zbyte, the remaining temporary memory (hereinafter, the remaining temporary memory 25 except the size of the logging data being read by the memory unit 11 of the personal computer 10 from the temporary memory 25) is used. The memory size of “temporary memory” is (Z− (Q × N)) bytes.
[0024]
If the communication speed when the memory unit 11 of the personal computer 10 reads the logging data from the temporary memory 25 of the PLC 20 is Sbit / sec, the communication speed is (S / 8) × (1/1) because 8 bits = 1 byte. 1000) bytes / msec. The logging data size that the memory unit 11 of the personal computer 10 collectively reads from the temporary memory 25 of the PLC 20 is Q × Nbytes, and the time required to read the data is Q × N × (8 / S) × 1000 msec. . If the logging interval is Tmsec, while the memory unit 11 of the personal computer 10 is reading the logging data from the temporary memory 25 of the PLC 20, data logged from the FB 21 to the temporary memory 25 (hereinafter, logging data during reading) ) Is (8QN / S) × 1000 × (1 / T) × Qbyte.
[0025]
Therefore, while the memory unit 11 is reading the logging data from the temporary memory 25, the logging data reading required for the size of the logging data to be logged from the FB 21 to the remaining temporary memory 25 becomes smaller than the size of the remaining temporary memory. The condition of the number N is
(8QN / S) × 1000 × (1 / T) × Q <Z− (Q × N) Equation (1)
Can be obtained from
[0026]
N that satisfies the expression (1) indicates that while the memory unit 11 is reading the logging data in the temporary memory 25, the temporary memory 25 stores the temporary memory 25 before the device data to be newly logged from the FB 21 is read into the memory unit 11. This is the condition that the logging data in is not overwritten.
[0027]
For example, when Equation (1) is applied to the case of the above-described communication speed of 9600 bits / sec, a logging interval of 1000 ms, a single logging data size of 2 bytes, and a total temporary memory size of 1024 bytes, when N is a natural number of 511 or less, Equation (1) ). Therefore, when one to 511 device data are logged in the temporary memory 25 and the memory unit 11 collectively reads one to 511 logging data from the temporary memory 25, this reading is performed. In the meantime, the temporary memory 25 does not overwrite the logging data in the temporary memory 25 before being read out to the memory unit 11 by the device data newly logged from the FB 21. If N is less than 1, the logging condition needs to be changed.
[0028]
Next, when the logging interval is T, a sequence program for turning on the reading permission flag 23 when the number of reading of the logging data reaches the calculated N is created and written into the PLC 20 (step S120). If the sequence program at this time is created by the FB 21, the sequence program can be repeatedly used.
[0029]
FIG. 4 is a flowchart showing a part of the logging processing method according to the embodiment of the present invention. After the above-described sequence program is written to the FB 21, device data is logged from the FB 21 to the temporary memory 25 (step S200). Thereafter, when the number of pieces of logging data recorded in the temporary memory 25 reaches N of the number of pieces of reading of logging data calculated in step S110 (step S210), the reading permission flag 23 is turned on (step S220). The read permission flag 23 is turned on in response to an instruction from the FB 21 after the N device data in the FB 21 are logged in the temporary memory 25.
[0030]
Here, after confirming that the read completion flag 22 in the PLC 20 is on (step S230), the read completion flag 22 is turned off (step S240), and the memory unit 11 stores the N pieces of logging data from the temporary memory 25. They are read out at once (step S250). During this reading process, the logging data in the FB 21 is logged in the remaining memory area of the temporary memory 25 other than the memory area used by the personal computer 10 for reading the N items.
[0031]
Next, when the memory unit 11 finishes reading out the N pieces of logging data, the reading completion flag 22 is turned on (step S260), and the reading permission flag 23 is turned off (step S270). When the read completion flag 22 is turned on, the memory unit 11 indicates a standby state in which the logging data of the temporary memory 25 can be read, and when the read permission flag 23 is turned off, the logging data in the temporary memory 25 does not reach N records. It will be. Steps S200 to S270 are repeated until the user performs an operation to stop the processing (step S280).
[0032]
As described above, according to the embodiment, the entire temporary memory area (size) of the temporary memory 25 is divided into an area (size) for N pieces of logging data and another area (size). Even when 11 is reading the logging data for the N records in the temporary memory 25 collectively, it is possible to log the device data of the FB 21 to an area other than the area for the N records in the temporary memory 25. Further, the time for the memory unit 11 to read out the N pieces of logging data in the temporary memory 25 collectively is set shorter than the time for logging new device data of the FB 21 to an area other than the area of the N pieces of temporary memory 25. While the memory unit 11 is reading the N pieces of logging data in the temporary memory 25, the data to be logged in the remaining area of the temporary memory 25 is overwritten by the logging data before being read out to the memory unit 11. It will not be erased. Therefore, it is possible to obtain logging data without omission according to the time transition without stopping the logging device for the repeated logging processing.
[0033]
【The invention's effect】
As described above, according to the present invention, there is an effect that it is possible to obtain logging data without omission according to a temporal transition without stopping the logging processing device with respect to the repeatedly performed logging processing.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a logging device according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a part of a logging processing method according to the embodiment of the present invention;
FIG. 3 is a diagram illustrating an example of a logging condition setting screen according to the embodiment of the present invention;
FIG. 4 is a flowchart showing a part of a logging processing method according to the embodiment of the present invention;
[Explanation of symbols]
Reference Signs List 10 personal computer, 11 memory unit, 12 program unit, 13-16 logging condition setting screen, 20 PLC, 21 FB, 22 read completion flag, 23 read permission flag, 24 device data, 25 temporary memory.

Claims (2)

A PLC having a function block in which circuit blocks repeatedly used in a sequence program are made into parts and a first memory unit in a ring buffer format in which device data of the function block is logged; a program unit; a second memory unit; A receiving data communication terminal device that has an input unit for inputting a logging condition and is electrically connected to the PLC and stores logging data from the first memory unit in the second memory unit; In the logging processing device,
The first memory unit stores the function data in a second area other than the first area storing the predetermined size data while simultaneously outputting logging data of the predetermined size to the second memory unit. A logging processing apparatus for logging new device data from a block and logging to the second area so that the previously logged new device data is not overwritten by new device data to be logged later. The program unit includes a communication speed between the receiving side data communication terminal device and the PLC, a logging time interval from the function block to the first memory unit, and logging at one time from the function block to the first memory unit. The logging processing device according to claim 1, wherein the predetermined size is calculated from a data size of the first memory unit and a total memory size of the first memory unit.

Images