Chapter 1 CoE Drive Overview ASDA A2-E 1.5.6 CN-STO CN-STO Connector (male) Revision April, 2015 1-13 Pin No Signal Name Terminal Symbol Function and Description 1 VDD24V power COM+ VDD (24V) power is the same as the voltage of Pin11 in CN1 2 STO A _ STO A _ STO input pin A+ 3 /STO A _ /STO A _ STO input pin A- 4 STO B _ STO B _ STO input pin B+ 5 /STO B _ /STO B _ STO input pin B- 6 FDBK A _ FDBK A _ STO alarm output pin A, Relay Output Max. Current : 1A 7 FDBK B _ FDBK B _ STO alarm output pin B, Relay Output Max. Current : 1A 8 COM- COM- VDD(24V) power ground Caution: Do not apply to dual power or it may damage the servo drive.