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Task Features Section 4-1
4-1 Task Features
4-1-1 Overview
CS/CJ-series control operations can be divided by functions, controlled
devices, processes, developers, or any other criteria and each operation can
be programmed in a separate unit called a “task.” Using tasks provides the fol-
lowing advantages:
1,2,3... 1. Programs can be developed simultaneously by several people.
Individually designed program parts can be assembled with very little effort
into a single user program.
2. Programs can be standardized in modules.
More specifically, the following Programming Device functions will be com-
bined to develop programs that are standalone standard modules rather
than programs designed for specific systems (machines, devices). This
means that programs developed separately by several people can be
readily combine.
• Programming using symbols
• Global and local designation of symbols
• Automatic allocation of local symbols to addresses
3. Improved overall response.
Overall response is improved because the system is divided into an overall
control program as well as individual control programs, and only specific
programs will be executed as needed.
4. Easy revision and debugging.
• Debugging is much more efficient because tasks can be developed
separately by several people, and then revised and debugged by indi-
vidual task.
• Maintenance is simple because only the task that needs revising will
be changed in order to make specification or other changes.
• Debugging is more efficient because it is easy to determine whether
an address is specific or global and addresses between programs only
need to be checked once during debugging because symbols are des-
ignated globally or locally and local symbols are allocated automatical-
ly to addresses through Programming Devices.
5. Easy to switch programs.
A task control instruction in the program can be used to execute product-
specific tasks (programs) when changing operation is necessary.
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