Support For Retentive Data; Figure 26: Support For Retentive Data; Figure 27: Support For Retentive Data - KEB COMBICONTROL C6 SMART Instructions For Use Manual

COMMISSIONING A PROjeCT

5.1.4 Support for retentive data

C6 SMART systems are equipped with a Micro UPS specifically designed to support the
data memory retention.
In COMBIVIS studio 6 the retentive variables can retain their value throughout the usual
program run period. They are declared as "Retain Variables" or even more stringent as
"Persistent Variables". For each case a separate memory area is used.
Please check the COMBIVIS studio 6 manual for any additional detail about retentive
data.
The use of the retentive areas does not require any specific configuration except for
declaring the variable in the proper area according to the COMBIVIS studio 6 program-
ming manual.
At the moment of a power failure when the voltage is below the threshold for more than
50ms the UPS triggers an event and the system will follow a four step sequence to save
data:
•
•
•
•
The charging status of the UPS can be checked by means of the UpsInterface object
(IoDrvUPS), which is coupled to the target device C6 SMART.
Figure 26:
Figure 27:
The panel display and the USB ports are turned off in order to save energy.
All running IEC tasks are terminated. Thus the retentive areas are consistent.
The system stores the retentive data in the MRAM of the C6 SMART.
The PLC control is terminated.
Support for retentive data
Support for retentive data
To start the backup process, the capacitors must be fully charged (after charg-
ing, the Power LED must be switched from yellow to green).
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