0V 24V0V 24V
*
XS2so
Solid State Safety
Output Module
XS26-2
Base Controller
Power
Supply
Power
Supply
#1 #2
Power
Supply
0V 24V
24V
0V
*
Functional Earth
(optional)
Preferred 0V routing plan when a single power supply is used
Preferred 0V routing plan when separate power supplies are used
+/- 30V peak
*
Local 0V
Common
Local 0V
Common
The voltage for all safety input devices (including all Input Expansion Modules)
should be measured in reference to the 0V terminal of the Base Controller
0V
24V
24V
0V
0V
24V
XS2so
Solid State Safety
Output Module
(limited isolation)
XS26-2
Base Controller
Figure 68. Wiring Diagram—Recommended Grounding
6.6.2 Safety Relay Outputs
Expansion Safety Relay modules have isolated redundant relay outputs that can be used to control/switch a wide range of
power characteristics (see Specifications on page 11). Unlike a solid-state Safety Output, within an output module an
individual safety relay output (Mx:ROx) functions as a group and cannot be split.
The Safety Relay Outputs are controlled and monitored by the Base Controller without requiring additional wiring.
For circuits requiring the highest levels of safety and reliability, when used in pairs (two N.O. or N.O. and a N.C.), either
Safety Output must be capable of stopping the motion of the guarded machine controlled by a safety output in an
emergency. When used individually (a single N.O. output), fault exclusion must ensure that failures cannot occur that
would result in the loss of the safety function, for example, a short-circuit to another safety output or a secondary source
of energy or voltage. For more information, see Single-channel Control in Safety (Protective) Stop Circuits on page 92
and Fault Exclusion on page 69.
XS/SC26-2 Safety Controller
89
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