STEP7 can not control block

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1) CPU in STOP mode, the status bar displays a red background STOP. Switch the CPU to RUN mode, the status bar turns green background RUN, it can be monitored.

2) not using the CALL instruction block is monitored, block call condition to be monitored is not satisfied, the block being monitored is not executed, you can not monitor it.

3) operating system only monitors the selected block and the block after it. Block does not monitor the selected program before.

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