Phoenix Contact VL2 PPC 2000 EX User Manual page 7

For your safety
Real-time clock battery is a CR2032, CR2032H, or BR2032, 3 V, lithium coin type.
Replacement batteries must be rated as -20°C to +80°C or better.
Substitution of components may impair suitability for Class I, Division 2, ATEX/IEC EX Zone
2 and Zone 22.
USB ports may only be connected or disconnected in an area known to be non-hazardous.
The VL2 PPC ... EX shall be installed in such a way that the risk of mechanical impact is low.
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