Siemens SIMATIC CM35 Manual page 108

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CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
Note
When the digital outputs are controlled , the user program must ensure that
active channels (timer running) are not affected.
To prevent a just expired timer from being turned on again accidentally (or a
running timer from being turned off) by control of the outputs, the outputs
should not be controlled unless all timers have expired or have been stopped.
To be noticed by the CM35, the status of the DO byte must have changed by
at least one bit from its last status (see also page 4- - 22).
Timer Operating Mode
7-11

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