Important: When Solid-State Safety Output modules (XS2so or XS4so) are used, the power to those
modules must be applied either prior to or within 5 seconds after applying the power to the Base
Controller, if using separate power supplies.
WARNING: Single Channel (Split) Outputs use in Safety Critical Applications
If a single channel output is used in a safety critical application then fault exclusion principles must be
incorporated to ensure Category 3 safety operation. Routing and managing single channel output wires
so shorts to other outputs or other voltage sources are not possible is an example of a proper fault
exclusion method. Failure to incorporate proper fault exclusion methods when using single channel
outputs in safety critical applications may cause a loss of safety control and result in a serious injury or
death.
Whenever possible, incorporating External Device Monitoring (EDM) and/or Adjustable Valve Monitoring (AVM) is highly
recommended to monitor devices under control (FSDs and MPCEs) for unsafe failures. See
on page 53 for more information.
Output Connections
The Safety Outputs must be connected to the machine control such that the machine’s safety related control system
interrupts the circuit or power to the machine primary control element(s) (MPCE), resulting in a non-hazardous condition.
When used, Final Switching Devices (FSDs) typically accomplish this when the safety outputs go to the Off state. Refer to
the
on page 16 before making connections and interfacing the Safety Controller to the machine.
The level of the safety circuit integrity must be determined by risk assessment; this level is dependent on the configuration,
proper installation of external circuitry, and the type and installation of the devices under control (FSDs and MPCEs). The
solid-state safety outputs are suitable for Category 4 PL e / SIL 3 applications when controlled in pairs (not split) and for
applications up to Category 3 PL d / SIL 2 when acting independently (split) when appropriate fault exclusion has been
on page 51 for hookup examples.
WARNING:
• Safety Output Lead Resistance
• A resistance higher than 10 ohms could mask a short between the dual-channel safety outputs
and could create an unsafe condition that could result in serious injury or death.
• Do not exceed 10 ohms resistance in the safety output wires.
XS/SC26-2 and SC10-2 Safety Controllers
50
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