220
11 DATA LOGGING FUNCTION
11.16 Precautions to Take When Using the Data Logging Function
Data in the CPU module when a device/label is specified
Before starting the data logging, write the following data to the CPU module from the engineering tool.
In the following cases, data cannot be written with CPU Module Logging Configuration Tool.
CPU parameter at the start operation of data logging
When performing data logging in which the local device or local label specifying the program name (execution order) in the
program setting of the CPU parameter is specified, do not change and write the CPU parameter to the CPU module after
writing the data logging setting file. An error occurs during data logging registration after the CPU parameter is written.
Change the internal buffer capacity in the CPU parameter used for data logging before writing the data logging setting file.
Change of the file when a label is specified
Do not perform the following operations after the registration of the data logging setting by starting the data logging or
between the completion of writing the data logging setting file and the registration of the data logging setting.
These operations change assignment of labels, and thus the data logging may not be performed to the specified label. If a file
is changed, perform either of the following operations.
• Import the project of the engineering tool to CPU Module Logging Configuration Tool again, and then write the data logging
setting again.
• Read the file from the CPU module with "Online Data Operation" of the engineering tool. Save the project with the
engineering tool and import the project to CPU Module Logging Configuration Tool again, and then write the data logging
setting again.
Using SD940 (Stop direction at file change on label specification) can prevent the data logging to a different
file.
Turning on the bit of SD940 corresponding to the data logging setting No. being executed generates an error
at the following timings.
• When the data logging is being executed: At writing a program file or global label setting file
• When the data logging is stopped or paused: At the registration of the data logging after a program file or
global label setting file is written
For details on SD940, refer to the following.
Page 860 Latch area
Device/label specification Data required to be written
When a local device is specified The CPU parameter including the program name specified with CPU Module Logging Configuration Tool
When a global label is specified Project data that is read using CPU Module Logging Configuration Tool (global label setting file)
When a local label is specified • Project data that is read using CPU Module Logging Configuration Tool (the program file with the corresponding
program name)
• The CPU parameter including the program name specified with CPU Module Logging Configuration Tool
Device/label specification Description
When a local device is specified • The CPU parameters do not exist in the CPU module.
• The program name specified is not set in the program setting in the CPU parameters.
When a global label is specified • The global label setting file does not exist in the CPU module.
• The global label setting file in the CPU module and the project that is read using CPU Module Logging Configuration
Tool (global label setting file) do not match.
When a local label is specified • The CPU parameters and the program file which has the corresponding program name do not exist in the CPU module.
• The program name is not set in the program setting in the CPU parameters.
• The program file which has the corresponding program name in the CPU module and the project that is read using CPU
Module Logging Configuration Tool (the program file which has the corresponding program name) do not match.
Label specification Description
When a global label is specified Writing the global label setting file where a global label is added, changed, or deleted.
When a local label is specified Writing a program file where a program is changed (including addition, change, and deletion of a local label).
To Next Page
Loading...
