SIMATIC RF120C 
Operating Instructions, 02/2021, C79000-G8976-C328-03 
3 
Table of contents 
1  Introduction ........................................................................................................................................... 5 
1.1  Security information ............................................................................................................ 6 
2  Description ............................................................................................................................................. 7 
2.1  Area of application and features ........................................................................................... 7 
2.2  Setup and configuration ...................................................................................................... 8 
2.3  Integration ........................................................................................................................ 10 
3  Mounting, connecting up and commissioning .................................................................................... 11 
3.1  Important notes on using the device .................................................................................. 11 
3.2  Installing and commissioning the RF120C .......................................................................... 12 
3.3  Connecting readers / serial devices ..................................................................................... 17 
3.4  External power supply........................................................................................................ 19 
3.5  Pin assignment of the socket for the external power supply ................................................ 20 
3.6  Pinout of the D-sub socket ................................................................................................. 20 
4  Configuration and parameter assignment .......................................................................................... 21 
4.1  Hardware configuration ..................................................................................................... 21 
4.2  Configuration .................................................................................................................... 21 
4.3  Parameter assignment with the device configuration ......................................................... 21 
4.3.1  "Module parameters" parameter group ............................................................................... 22 
4.3.2  "Frame" parameter group ................................................................................................... 23 
4.4  Programming via SIMATIC controller .................................................................................. 25 
5  Service and maintenance .................................................................................................................... 27 
5.1  LED status display on the RF120C ....................................................................................... 27 
5.2  Diagnostics ........................................................................................................................ 29 
5.3  Error messages .................................................................................................................. 31 
5.4  Module replacement .......................................................................................................... 31 
6  Technical data ...................................................................................................................................... 33 
7  Dimension drawings ............................................................................................................................ 35 
A  Appendix.............................................................................................................................................. 37 
A.1  Certificates & approvals...................................................................................................... 37 
A.1.1  Approvals .......................................................................................................................... 37 
A.1.2  Standards and test regulations ........................................................................................... 42