Roland udk20 Manual page 74

Communication with the PLC
Check whether the output OUT0 „Enable" has switched to HIGH (ready for operation), otherwise there is a fault

condition.
Before starting a measurement, all inputs must be LOW for 30 ms.

Switch the input IN1 „Measurement Start" to HIGH.

After 30 ms the outputs OUT 1-3 have switched to HIGH for the duration of the measurement

(system reaction time, see chapters 2.2 - depending on material and thickness).
After point  or 30 ms after point  switch the input IN1 „Measurement Start" to LOW.

The measurement result is available (after the system reaction time t

until the new action is initiated.
Example with „fast" PLC / BUS cycle time (< 20 ms):
Check whether the output OUT0 „Enable" has switched to HIGH.

All inputs must be LOW for more then 30 ms.

After that switch input IN1 „Measurement Start" to HIGH.

Check whether all outputs OUT1-3 switch to HIGH within 30 ms.

After that, switch input IN1 to LOW.

Continue to interrogate the outputs OUT1-3, until (after system reaction time t

Example with „slow" PLC / BUS cycle time (> 20 ms):
Check whether the output OUT0 „Enable" has switched to HIGH.

All inputs must be LOW for more then 30 ms.

After that, switch input IN1 „Measurement Start" to HIGH.

After more than 30 ms switch input IN1 „Measurement Start" to LOW.

Continue to interrogate the outputs OUT1-3, until (after system reaction time t

74
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Detector R1000 series UDK20
Manual
) at the outputs OUT1-3, it remains frozen
s
) the measurement result is available.
s
) the measurement result is available.
s
B0048991 / Rev. 1.3