SCALANCE M874, M876 
Operating Instructions, 06/2015, C79000-G8976-C331-05 
7 
  Preface ................................................................................................................................................... 3 
1  Description of the device ......................................................................................................................... 9 
1.1  Product characteristics.............................................................................................................. 9 
1.2  Accessories ............................................................................................................................. 11 
1.3  LED display ............................................................................................................................. 12 
1.3.1  SCALANCE M874-2, M874-3 ................................................................................................. 12 
1.3.2  SCALANCE M876-3, M876-4 ................................................................................................. 14 
1.4  SET button .............................................................................................................................. 17 
1.5  C-PLUG and KEY-PLUG ........................................................................................................ 19 
2  Installation ............................................................................................................................................ 21 
2.1  Securing the housing .............................................................................................................. 22 
2.2  Wall mounting ......................................................................................................................... 23 
2.3  Installation on the DIN rail ....................................................................................................... 24 
2.4  Installing on the S7-300 standard rail ..................................................................................... 26 
2.5  Installing on the S7-1500 standard rail ................................................................................... 28 
3  Connecting up ....................................................................................................................................... 31 
3.1  Safety when connecting up ..................................................................................................... 31 
3.2  SIM card .................................................................................................................................. 33 
3.3  Power supply .......................................................................................................................... 34 
3.4  Grounding ............................................................................................................................... 36 
3.5  Digital input/output .................................................................................................................. 37 
3.6  Antennas ................................................................................................................................. 39 
3.7  Ethernet port ........................................................................................................................... 42 
3.8  Inserting and removing the PLUG .......................................................................................... 43 
4  Dimension drawing ............................................................................................................................... 45 
4.1  SCALANCE M874-2, M874-3 ................................................................................................. 45 
4.2  SCALANCE M876-3, M876-4 ................................................................................................. 47 
5  Technical specifications ........................................................................................................................ 49 
5.1  GPRS/EDGE router SCALANCE M874-2 .............................................................................. 49 
5.2  HSPA+ router SCALANCE M874-3 ........................................................................................ 52 
5.3  HSPA+ router SCALANCE M876-3 ........................................................................................ 55 
5.4  LTE router SCALANCE M876-4 ............................................................................................. 58