12.6 Real-time clock
The real-time clock of the control is buffered in the switched-off state using the inserted battery. If no
voltage is applied, the battery buffers the real-time clock for at least 3 years. For notes on changing the
battery, see ⮫ Chapter 14.3 “Battery change ” on page 42.
It is recommended to set the time via SNTP.
12.7 SD card
There is a slot for the micro SD card on the front of the control.
Use only SD cards available as accessories, see ⮫ Chapter 5.2 “SD card” on page 11. These
SD cards are formatted and tested for the control.
A correct functioning of other SD cards cannot be ensured.
12.8
USB interface
There is a USB interface (type C, USB 2.0) on the front side of the control. The USB interface can be
used to connect USB storage media (only FAT16 and FAT32), scanners and similar USB devices.
The USB interface provides a voltage supply with DC 5 V and 0.5 A for external devices. The USB
interface is switched off up to the next voltage cycle if the current is exceeded.
The USB interface is not enabled for the COREX-C-X2 variant.
The maximum cable length allowed is 3 m.
NOTICE
Device damage due to external supply via the USB interface
The grounding at the 24 V power connector XD10 always has to be con-
nected.
12.9
Battery
A battery is included and working in the device upon delivery. Battery designation: Lithium battery 3.0
V CR1025 (30 mAH).
The battery is used to buffer the real-time clock if the control is disconnected from voltage. A circuit
monitors the battery state.
For notes on changing the battery, see ⮫ Chapter 14.3 “Battery change ” on page 42.
A discharged battery causes an incorrect system time.
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