Siemens siprotec 7SA6 User Manual page 483

Command Output
and Switching
Relays
7SA6 Manual
C53000-G1176-C133-1
The "plus" appearing in a feedback information confirms that the command was
successful, the command was as expected, in other words positive. The "minus" is a
negative confirmation and means that the command was not fulfilled as expected.
The command types needed for tripping and closing of the switchgear or for raising
and lowering of transformer taps are described in Section 5.2 and Subsection 5.2.1.
Functions
6-301