1-second UPS (persistent data)
CX52x0
53
Version: 1.0
8
1-second UPS (persistent data)
Loss of data
The use of the 1-second UPS outside of the documented possibilities can lead to loss or corruption
of data.
Use only TwinCAT to control the 1-second UPS and save only persistent data with a maximum size
of 1 MB.
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. 30: 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.
Storage location and names of the files:
The persistent data are saved by default in the TwinCAT boot directory:
Development environment
File path
File name
TwinCAT 2
\\TwinCat\Boot\
TCPLC_T_x.wbp
TCPLC_T_x.wb~ (backup)
The x in the file name stands for
the number of the runtime system.
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.
Configure the 1-second UPS as follows in order to save persistent data:
• In the case of the CX52x0, check whether the 1-second UPS is activated or deactivated in the BIOS
(see: BIOS settings). Configure the Windows write filter and issue the corresponding write permissions
in order to be able to save persistent data (see: Windows write filter).
