sparkysliderz
Member
Hi Guys,
Is it possible to interrupt program flow to guarantee the capture of an event?
Am I right in saying that OB1 only takes a look at the state of inputs and outputs at the beginning of each scan?
For example. Our PLC cycles at around 13 – 17 msec’s,. does that mean that the inputs and outputs are only "mapped" 13 – 17msec’s?
If we have a retro reflective sensor on an input and the sensor only signals for much less than the scan time of OB1, will the sensor signal ever be missed?
Is there any way of guaranteeing that this event (signal) will not be missed?
Is it possible to interrupt program flow to guarantee the capture of an event?
Am I right in saying that OB1 only takes a look at the state of inputs and outputs at the beginning of each scan?
For example. Our PLC cycles at around 13 – 17 msec’s,. does that mean that the inputs and outputs are only "mapped" 13 – 17msec’s?
If we have a retro reflective sensor on an input and the sensor only signals for much less than the scan time of OB1, will the sensor signal ever be missed?
Is there any way of guaranteeing that this event (signal) will not be missed?