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7.5.4 File limits
A maximum of 170 files can be saved in the CF card.
If the number of files exceeds 170, an error message
(Excess CF card memory
capacity) appears on the PV display regardless of the remaining memory capacity in the
CF card.
7.5.5 Data logging cycle
If logging time of data (depending on number of connected units, and Data logging items)
exceeds the logging cycle, previous data will be saved.
(e.g.) If the following are selected:
Number of connected units: 8
Data logging items: 5 (PV, SV, OUT1 MV, OUT2 MV, controller status)
Data logging cycle: 1sec
Controller response time: Approx. 50ms per item
50ms x 5 (items)=250ms
250ms x 8 (units)= Approx. 2000ms
If writing time to CF card is 500ms:
Thus total response time: 500ms=2500ms (2.5sec)
As Data logging cycle is 1sec, the previous data will be saved 2 or 3 times.
7.5.6 Power failure during data logging
If power failure occurs during data logging, data is automatically saved in the file.
After the power is restored, data logging is stopped.
However, if external operation input LOG terminals 19 and 20 are connected (Contact
Closed), data logging automatically resumes, and writes the data in a new file.
If momentary power failure occurs while writing to the CF card, one batch of logging
data might be lost.
7.6 How to stop data logging
7.6.1 Data logging stop
There are 2 ways to stop data logging. One is with the
key, and the other is using
the external operation input.
To stop logging with the
key
Press the
key for approx. 1 second.
The LOG indicator goes off, and logging stops.
To stop logging using the external operation input
Disconnect LOG terminals 19 and 20 (Contact from Closed to Open).
The LOG indicator goes off, and logging stops.
7.6.2 External operation priority
If “External operation input (LOG) has priority” is selected from “External operation
priority selection” in the Data logging condition setting mode, and when LOG terminals
19 and 20 are connected (Contact Closed), data logging cannot be stopped by the
key.
However, if LOG terminals 19 and 20 are disconnected (Contact Open), logging by the
key can be started or stopped.
