
Safe Torque Off
6-11
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
STO Technical Specification
Inputs Specification
STO A Input and STO B Input comply with IEC61131-2. Note: inputs do not have hysteresis.
Recommended input voltage for low level:
0V to +5V
Recommended input voltage for high level:
+21.6V to +26.4V
Typical input threshold voltage:
+10.5V
Absolute maximum input voltage:
-30V to +30V
Typical input current @ 24V
9mA
Indeterminate input range:
+5V to +15V. Function is undefined.
Fault detection time
:
2.3sec typical;
< 1.6sec will not generate a fault
> 3.0sec will generate a fault.
3
A fault is defined in this context as Channel A and Channel B inputs being in opposite logic states
.