Omron OS32C Series User Manual page 47

The Zone Input Switch Tolerance(T
able to start the switching of the inputs.
Besides T and T , there is an additional delay of up to T
tol delay
select inputs is recognized.
Therefore, assuming switching of the inputs starts at t
between t = t + T
min start delay
Monitoring zone set
T
tol
t
Start
switching
Fig. 2-10 Zone set select input switching and zone set switch.
 How To Configure Input Switch Circuitry Timing
Relative to t , the longest time it will take to begin monitoring Zone set B is t
start
account the scanner's response time required to actually detect an object present in Zone set B, the
longest time to turning off the OSSDs relative to t
The critical timing guarantee to be met when changing zone sets is t
circuitry should begin switching the zone set select inputs prior to t
activated early enough to detect an object previously present in the zone set. The amount of time prior
to t to start switching can be derived from t
DangerZoneB
This means the switching circuitry must be configured to begin switching the inputs T
t to ensure safe monitoring of Zone set B, where
DangerZoneB
If t (switching start time) is configured without consideration of T
start
time), object detection within the new safety zone after switching and turning OFF of the safety outputs
may be delayed.
) is the tolerance on when the zone switching circuitry is actually
tol
- T and t = t + T
tol max start
Zone set A
T T
tol delay
T
delay
t =
min
start
t T - T
+
start delay
Zone set switches
(earliest)
t = t
maxToOff
t = t - (T
start DangerZoneB response
T = T
maxReaction response
Operating States & Output Modes
before the change on the zone set
sample
, the system is guaranteed to switch zones
start
+ T + T .
delay tol sample
Zone set A
OR Zone set B
Zone set B
T
sample
=
t
max
t T T T
+ + +
start delay tol sample
tol
Zone set switches
(latest)
can be shown as:
start
+ T
max response
DangerZoneB
DangerZoneB
by equating it to t
maxToOff
+ T + T + T
delay tol sample
+ T + T + T
delay tol sample
maxReaction
time
. When you take into
max
. The input switching
to ensure Zone B is
.
DangerZoneB
)
before
maxReaction
(total maximum reaction
OS32C
User's Manual
E
27