Hitachi MICRO-EHV+ - Backup; USB Memory Port Specifications

Chapter 2 Specifications
2 – 14
2.12 USB memory port specifications
Table 2.11 USB memory port specifications
Item
Specifications
Interface
USB2.0 Full Speed (12M)
Connect to USB-HUB
Not supported
Supported format
FAT32 (Recommended), FAT16
(2GB USB memory of FAT16 is not recommended because
access speed is not fast enough.)
Max. USB memory size
32GB (FAT32), 2GB (FAT16)
Max. file size
2GB
Max. file name
99 characters (ASCII only, Unicode is not supported.)
Not allowed characters for file/directory name
¥ / : * ?  < >
Max. number of files in root directory
7281
Max. simultaneous open file
10
N o t e
 2GB USB memory of FAT16 is not recommended because access speed is not fast enough, which could
result in overload exception especially for WebVisualization.
 To avoid contact failure due to vibration, be sure to use small type USB memory device as follows.
2.13 Backup
(1) Battery (optional)
Retentive data and RTC (realtime clock) data can be kept by MV-BAT battery as below.
Battery life (Total power failure time)[year]
Guaranteed value (MIN) @55C
Actual value (MAX) @25C
5
10
(2) Capacitor
Retentive data can be kept for 12 hours (at 25 C) by a built-in capacitor.
*: To keep the retentive data or RTC data for 12 hours, it is required to charge the capacitor by supplying power
to PLC for more than 20 minutes.