BECKHOFF DK9222-0211-0021 - Manual (Page 6)

I/O
XFC
Application Note DK9222-0211-0021
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Apart from the time-constant measurement of events by the time-stamped process data, actions are also executed at a
precisely defined time. Thus, parallel wired peripherals can be eliminated on test and experimental benches by means of not
initiating an action directly by a user intervention, but rather by the user ‘announcing’ it at an exactly defined process data
point/time.
The described relations are decisive for test benches in which a volume throughput per unit time is measured.
External reference time
PLC
Device
under
Test
Reference
Measured value
Calibration to ext. reference
EL1252
Fig. 6 Practical time stamp example: calibration to an external reference
– 2-channel digital input terminal with time stamp www.beckhoff.com/EL1252
– 2-channel digital output terminal 24 V DC with overexcitation www.beckhoff.com/EL2212
– 2-channel digital output terminal with time stamp, tri-state www.beckhoff.com/EL2252
– XFC: The new class of Control Performance www.beckhoff.com/XFC
– EtherCAT www.beckhoff.com/EtherCAT
New Automation Technology Beckhoff 6