Beckhoff CX8190, Manual

Page: 46 / 72

Programming
CX8190 46 Version: 1.5
7 Programming
7.1 1-second UPS (persistent variables)
Loss of data
Use only TwinCAT to control the 1-second UPS and save only persistent data with a maximum size
of 1 MB. Use beyond this may result in data loss or corrupt data.
The 1-second UPS is an UltraCap capacitor that continues to supply the processor with power in the event of
a power failure. During this period persistent data can be saved, which are available on switching on again.
Fig. 10: Behavior of systems in the event of a power failure without and with a 1-second UPS.
Since the 1-second UPS is designed for the entire service life, the holding time is considerably longer with
new devices. The capacitors age over the course of time and the holding time decreases. Therefore a
maximum of 1 MB persistent data can be reliably saved over the entire service life. Do not save any other
data and do not use any other applications to control the 1-second UPS.
Please note that the 1-second UPS does not supply power to the K-bus or the E-bus and that their data may
already be invalid when the 1-second UPS is activated. Also, the fieldbus system (or Ethernet) may not work
or not work properly once the 1-second UPS was activated.
Table 12: Storage location and names of the files in TwinCAT 3.
Development environment File path File name
TwinCAT 3 \\TwinCat\3.1\Boot\Plc Port_85x.bootdata
Port_85x.bootdata-old (backup)
The x in the file name stands for
the number of the runtime system.