Instruction
Manual
DataVS1
Series
37
Note
: if the number of received Trigger Input pulses is 0 or higher than 20 (number of available
Memory Slots) the Inspection selection will be ignored and the sensor will resume the previous
running Inspection. In this case, as feedback (phases 5, 6, 7), the sensor will give the Slot
number of the previous running Inspection.
Phase 5: All sensor outputs LOW.
After the Select Input is set to LOW by the PLC (Phase 4) and the MIN_PULSE_DUR interval has
exceeded the sensor sets all outputs LOW. This transition means that the sensor is now ready to send
the ACKNOWLEDGE message.
Note
: while Select Input signal is LOW but outputs are still HIGH the sensor will not accept,
count or response to any Trigger Input pulse.
Phase 6: Trigger Input HIGH. Sensor LSB AKNOWLEDGE BITS.
The first Trigger Input pulse after phase 5 activates the Inspection selection acknowledge. The sensor
sets its outputs in order to represent the LSB (Less Significant Bits) of the binary coding of the
Inspection selection number, where output 1 represents the LSB of the first 3 bits and output 3
represents the MSB (Most Significant Bit) of the first three bits.
Example:
o
Inspection number, binary coded, is represented by 6 bits:
b1 b2 b3 b4 b5 b6
. In
phase
6
only LSB are sent:
b4, b5, b6.
o
Acknowledge bits, phase 6:
output1=b6
,
output2=b5
,
output3=b4
.
Note
: a timeout T2 will end phase 6 if no Trigger Input signal is received after phase 5 within 4
seconds. If T2 occurs the Inspection selection will be ignored and the sensor will resume the
previous running Inspection.
Phase 7: Trigger Input HIGH. Sensor MSB ACKNOWLWDGE BITS.
The second Trigger Input pulse after phase 5 activates the Inspection selection acknowledge. The
sensor sets its outputs in order to represent the MSB (Most Significant Bits) of the binary coding of the
Inspection selection number, where output 1 represents the LSB of the first 3 bits and output 3
represents the MSB of the first three bits.
Example:
o
Inspection number, binary coded, is represented by 6 bits:
b1 b2 b3 b4 b5 b6
. In
phase 7
only MSB are sent:
b1, b2, b3.
o
Acknowledge bits, phase 6:
output1=b3
,
output2=b2
,
output3=b1
.
Note
: a timeout T2 will end phase 7 if no Trigger Input signal is received after phase 6 within 4
seconds. If T2 occurs the Inspection selection will be ignored and the sensor will resume the
previous running Inspection.
Phase 8: Trigger Inputs HIGH: PLC ACKNOLEDGE. All sensor outputs HIGH.
The third Trigger Inputs pulse after phase 5 represents the PLC acknowledge and the END of the
protocol. After MIN_PULSE_DUR time interval from the instant when the sensor has received the third
Trigger Input pulse all sensor outputs are set to HIGH, representing the END of the process. The sensor
will keep outputs HIGH until the Inspection loading has finished; after the Inspection has successfully
been loaded all sensor outputs are set to LOW.
Note
: a timeout T2 will end phase 8 if no Trigger Input signal is received after phase 7 within 4
seconds. If T2 occurs the Inspection selection will be ignored and the sensor will resume the
previous running Inspection.
Note
: the Inspection loading time can vary depending on the Controls included in the Inspection
to be loaded. In the worst case the loading process can take 600ms; this case is represented by
n Inspection containing of 25 Geometric Pattern Match tools.
