Baumer BA OADM20x659x - Handbuch (Seite 42)

Manual_OADM20x659_DE_EN.doc 42/48 Baumer
04.12.12 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 20I6591 10 ... 250 µs > 2.2 ms 3 µs ... 340 µs
OADM 20I6592 10 ... 250 µs > 3 ms 3 µs ... 670 µs
OADM 20I6593 10 ... 250 µs > 4 ms 3 µs ... 1330 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 20I659…, 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