Siemens SIMATIC HMI OP 77B Operating Instructions Manual page 3

5 H O H D V H       
Operating safety and safety regulations
Detailed information on operating safety and the
applicable safety regulations is provided in the
"OP 77B" operating instructions.
Voltage supply
Warning
The OP 77B complies to Protection Class I in
accordance with EN 61131-2 and EN 50178.
Ensure safe electrical insulation of the power supply.
Only use mains power supply units which fulfill the
standards for SELV and PELV.
When dimensioning the power supply, take a voltage
drop in the connection cable into account!
Operating Instructions (Compact) – for
professionals
Important information on the OP 77B is summarized in these
Operating Instructions (Compact).
Operating Instructions
Detailed information on the OP 77B is provided in the "OP 77B"
operating instructions.
Migration
Information on migration of existing OP7 and C7-633 projects to
WinCC flexible is provided in the "WinCC flexible Migration"
operating instructions.
PDF files on this topic are also available in Internet under
http://www.ad.siemens.de/simatic/index_76.htm.