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10.2 Starting a measurement
Instead of using external signals, you can also use separate internal events to start and stop a
measurement in the DIGIFORCE
®
9311. You define the necessary settings for this in the Measurement
mode configuration menu; for details, please see section 6.3.2.6.4 “Start/Stop mode” on page 78.
10.2.1 Measurement without measurement-data logging
Standard measurement cycle without active logging of measurement data via the communication
interfaces (Ethernet, USB). For a Fieldbus interface, all result values are immediately available once
"OUT_READY" = 1.
Diagram 87: Without measurement-data logging
Cycle
a. The controller (PLC) checks whether the DIGIFORCE
®
9311 is ready
("OUT_READY" =1).
b. The PLC starts the measurement with "IN_START" = 1.
c. During the measurement phase the DIGIFORCE
®
9311 sets the signals "OUT_OK"
and "OUT_NOK" to 1 and the signal "OUT_READY" to 0.
d. The PLC stops the measurement by resetting the signal "IN_START" to 0.
e. The DIGIFORCE
®
9311 updates the result during the evaluation phase:
"OUT_OK" = 1 and "OUT_NOK" = 0: measurement OK
"OUT_OK" = 0 and "OUT_NOK" = 1: measurement NOK
f. At the end of the evaluation phase, the DIGIFORCE
®
9311 sets the signal
"OUT_READY" to 1 (in standby).
Note: As soon as the process has finished, the PLC (I/O or Fieldbus) can withdraw the Start signal to
stop the measurement phase. This applies only when an external Stop has been selected. If an
external Stop has not been configured, the Start can be withdrawn even before the end of the
process. After detecting the Stop, the DIGIFORCE
®
9311 evaluates the recorded measured
values and sets the evaluation signals OK or NOK. The other evaluation signal in each case is
set to "0". Once the full sequence has finished, the DIGIFORCE
®
9311 sets the READY signal.
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