
Table of contents
Preface ................................................................................................................................................... 3
1 Safety notices ...................................................................................................................................... 11
2 Security recommendations.................................................................................................................. 13
2.1 Passwords.......................................................................................................................... 13
3 Description of the device..................................................................................................................... 21
3.1 Product characteristics ....................................................................................................... 21
3.2 Device views...................................................................................................................... 22
3.2.1 SCALANCE M812 ............................................................................................................... 22
3.2.2 SCALANCE M816 ............................................................................................................... 23
3.3 Scope of delivery ............................................................................................................... 23
3.4 Accessories........................................................................................................................ 24
3.4.1 PLUG ................................................................................................................................. 25
3.4.2 Installation ........................................................................................................................ 25
3.5 Terminals........................................................................................................................... 26
3.6 LED display ........................................................................................................................ 27
3.6.1 SCALANCE M812-1 ............................................................................................................ 27
3.6.2 SCALANCE M816-1 ............................................................................................................ 30
3.7 SET button......................................................................................................................... 32
3.8 PLUG (SCALANCE M816).................................................................................................... 33
4 Installation and removal...................................................................................................................... 37
4.1 Safety notices for installation ............................................................................................. 37
4.2 Securing the housing......................................................................................................... 40
4.3 Wall mounting ................................................................................................................... 40
4.4 Installing on the DIN rail..................................................................................................... 42
4.5 Installing on the S7-300 standard rail ................................................................................. 43
4.6 Installing on the S7-1500 standard rail ............................................................................... 44
4.7 Mounting on a pedestal ..................................................................................................... 45
5 Connecting up ..................................................................................................................................... 47
5.1 Safety when connecting up................................................................................................ 47
5.2 Power supply ..................................................................................................................... 51
5.3 Grounding ......................................................................................................................... 52
5.4 Digital input/output ........................................................................................................... 52
5.5 DSL interface ..................................................................................................................... 55
SCALANCE M812, M816
Operating Instructions, 11/2023, C79000-G8976-C343-09 9