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JC-120MC
System command 123
System command 160
System command 161
System command 170
Jetter AG
Activate - Wait for communication
Effect:
The controller cyclically checks for communication requests from external
partners for 1 to 2 ms.
Advantage:
External communication partners get a faster reply from the controller.
Disadvantage:
Application program processing takes slightly longer.
Deactivate - Task switch on I/O access
Effect:
While the controller is accessing modules on the JX2 or JX3 system bus,
other tasks of the application program are not processed.
Advantage:
The controller executes I/O accesses as fast as possible.
Disadvantage:
As certain I/O accesses are significantly slower than access to internal
variables, response time of other tasks may increase.
Activate - Task switch on I/O access
Effect:
While the controller is accessing modules on the JX2 or JX3 system bus, it
processes the other tasks of the application program.
Advantage:
The execution time of certain I/O accesses which may be relatively long does
not affect the response time of other tasks.
Disadvantage:
The run time of the other tasks influences the execution time of several
I/O accesses.
Deactivate - Resume task time slot
Effect:
When a normal application task has been interrupted by a cyclic task or the
Ethernet system bus publisher, processing the following application task is
resumed. The remaining time of the time slot of the interrupted task lapses for
one cycle.
Programming
289
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