Siemens SIMATIC CM35 Manual page 69

Data Communication with the CM35
Order of
evaluation
Start
Change in
DO byte?
No
Change in
coordination
byte?
No
Conclude processing
4-22
When the CM35 recognizes that new data have been written in its address
area, the DO byte and the coordination byte are evaluated in the following
order.
Yes
Start/stop
byte
Yes
enable = 1?
Consistency
bit = 1?
Conclude processing
Note
Remember that either a change in the DO byte or a change in the coordina-
tion byte is evaluated.
Yes
No
parameter block
Yes
No
(4) J31069-D0416-U001-A5-7618
Evaluate DO
byte and
conclude proc-
essing.
Evaluate
start/stop byte
and conclude
processing.
Evaluate
and conclude
processing.
CM35 Counter Module