Siemens SIMATIC NET S7-1200 Compact Operating Instructions page 23

The device is intended for indoor use only.
The device may only be operated in an environment of contamination class 1 or 2 (see EN/IEC
60664-1, GB/T 16935.1).
When used in hazardous environments corresponding to Class I, Division 2 or Class I, Zone 2,
the device must be installed in a cabinet or a suitable enclosure.
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or combustible
atmosphere is present.
Unsuitable cables or connectors
Risk of explosion in hazardous areas
• Only use connectors that meet the requirements of the relevant type of protection.
• If necessary, tighten the connector screw connections, device fastening screws, grounding
• Close unused cable openings for electrical connections.
• Check the cables for a tight fit after installation.
Lack of equipotential bonding
If there is no equipotential bonding in hazardous areas, there is a risk of explosion due to
equalizing current or ignition sparks.
• Ensure that equipotential bonding is available for the device.
Compact Switch Module CSM 1277
Compact Operating Instructions, 06/2022, A2B00079397-02
WARNING
WARNING
WARNING
WARNING
WARNING
screws, etc. according to the specified torques.
WARNING
4.1 Important notes on using the device
Installation
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