The Ex digital input modules have the following mechanical features:

• Compact configuration;
  The rugged plastic housing contains:
  • Green LEDs for each circuit to indicate "1" signal (contact closed or I > 2.1 mA with NAMUR encoders to DIN 19234)
  • Red LED for each circuit to indicate wire break or short circuit
  • Slot for front connector and cable guide, protected by the front cover
  • Labeling area on the front cover.
• Easy installation:
  The module is mounted on the DIN rail and connected to the adjacent modules via bus connectors.
  There are no slot rules; the addresses of the inputs are predetermined by the slot.
• User-friendly wiring:
  The modules are wired by means of a plug-in front connector. When they are first plugged in, a coding element clicks into place so that the connector will only fit into modules of the same type. The front connector contains a special barrier for covering the module's 24 V load current supply. When the module is replaced, the front connector can be used in its fully wired state for the new module of the same type.