Baumer BA OADM20I6 OADM21I6 - Manual (Page 51)

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26.03.13 Frauenfeld, Switzerland
Synchronizing several sensors
Several sensors may be synchronized using an external clock. The clock cycle must be low for T1. The total
time of a cycle must be at least T2. Within 20 cycles all sensors will be synchronized.
Sensor T1 T2 T3
OADM 20I6x41, OADM 20I6x60,
OADM 20I6x72
10...250 µs > 1 ms 5 µs...450 µs
OADM 20I6x80, OADM 20I6x81 10...250 µs > 3 ms 15 µs...1800 µs
OADM 21I6x80, OADM 21I6x81 10...250 µs > 4 ms 18 µs...1900 µs
If sensors are being synchronized this way, they all start their cycles at the same time. This means they start
to sample light together. The length of the sampling interval T3 or shutter time depends on the surface. It
may range from T3. White or gray objects reflect well enough to enable a less than half the sampling of
interval T3 max. Only very dark objects actually need the maximum sampling interval.
Several sensors in non-synchronous use
To prevent a negative mutual influence, using several OADM 2xI6xxx/S14F, the sensor can be used with a
non-synchronous trigger pulse. 12-28 V must be applied to the sync input, so that the laser will be turned off.
The following timing has to be obtained (S1 = sensor 1, S2 = sensor 2).
T1
T2
12-28V
0V
sync. signal
analog output S1
t1
0 V
12-28 V
synch. input S1
4 mA
20 mA
0 V
12-28 V
4 mA
20 mA
t2
synch. input S2
analog output S2