Chapter 5. Power Supply / CPU
5-18
• If the RUN mode has been changed into the PAUSE mode while operating with the RUN mode, and then the
operation mode has been changed again into the RUN mode, the operation time spent with the PAUSE mode will
be ignored.
• When setting the execution cycle for a time driven task program, be cautious that execution requests for many time
driven task programs can occur. If four time driven task programs of cycle 2, 4,10 and 20sec are used, four
execution requests will occur every 20 sec and scan time can be momentarily extended.
4) External contact program processing method
In GM7series, it is different from GM1/2/3/4 to use normal digital input task program, not a separate interrupt input
module. The following explains in the case that the task (start-up condition) of a task program has been set to an
external input signal.
(1) Settings that have to be set for the task
• Set the contact No. of input module and priority for the task that will be used as start-up conditions of the task
programs to be executed. Priority will be the task number.
(2) External contact task processing
• The CPU module checks the occurrence of interrupt input every time and executes the task program, which are
designated by the contact at which the signal has been occurred.
(3) Precautions for using an external contact task.
• Input interrupt that is possible to set is up to %IX0.0.0~%IX0.0.7.
• While a task program which are designated by an input module having interrupt input, contact is being executed or
ready for its execution, if an execution request of a task program has been occurred to the same input contact then
the newly invoked task will be ignored, the representative task collision warning flag (_TASK_ERR) will be set to
ON, the detailed system error flag (_TC_BAMP [n], TC_CNT [n] will be set to ON at its corresponding location and
the occurrence time of the external task whose execution request has been congested.
• Execution request for a task program can be accepted only when the operation mode is in the RUN mode. That is,
if the RUN mode has been changed into the PAUSE mode while operating with the RUN mode and the operation
mode has been changed into the RUN mode again, all execution requests occurred during the operation with the
PAUSE mode will be ignored.
5) Internal task program processing method
The following explains the processing method when the task (start-up condition) of a task program has been set to the
contact of direct variable area (l, Q or M) or automatic variable area.
(1) Settings that have to be set for the task.
• Set the contact No. of input module and priority for the task that will be used as start-up conditions of the task
programs to be executed. Priority will be the task number.
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