Technology modules
D300529 0115 - BL67 I/O modules12-70
Singl
e synchronization:
– Active, if parameter byte "synchronization with Z": byte 1, bit 5 = 0.
–
In single synchronization the synchronization with the load value only takes place once
with the first 0 → 1 rising edge at the digital input, after setting the release-bit.
In single synchronization, a reset and a following setting of t
he control bit SYNC_REQ initiates a new
synchronization process. This process is started with the next rising edge 0 → 1 at the digital input.
Figure 12-36:
count signal
reference
frequency
period
internal
release
period
start of
period duration
measurement
actualization
of display
end of
period duration
measurement
1 upper count limit
2 load value
3 lower count limit
4 no synchronization without release
5 release set
6 single synchronization
7 no 2. synchronization
8 stop synchronization
9 start synchronization
10 single synchronization after new release
NOTE
A synchronization with Z during frequency measurement may lead to undefined values for
th
e time of the synchronization process.
Single
synchronization
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