Omron OS32C Series User Manual page 160

Appendix
Example 3. Create a third zone specifically for relaying the transition.
A third zone set (in the following diagram, Zone set C) is defined that is the combination of both Zone set A
and Zone set B. Using this mechanism, the zone set change is achieved by first changing from Zone set A to
Zone set C (which effectively begins monitoring Zone set B while continuing to monitor Zone set A) and then
changing from Zone set C to Zone set B. This allows the timing of the two different zone set switches to be
more flexible and easier to design.
Zone set B
Zone set B
OS32C
Zone set C
Fig. 7-10 The third zone set that relays switching (example 3).
The first switch (Zone set A to Zone set C) should be setup to meet the same criteria defined previously for
specifying t relative to t
start
The second switch (Zone set C to Zone set B) should be setup so that t
switch, is guaranteed to be earlier than t
OS32C
140
User's Manual
Zone set C
Danger Area during
zone set switching
NOT APPLICABLE
OS32C
Resulting zones
OS32C
New
OS32C
, in this case t
DangerZoneB
relative to t
min
Zone set A
Zone set A
.
DangerZoneC
EndZoneA
of this second switch.
start
, which is relative to the first