2.7 Input and Output Connections
2.7.1 Safety and Non-Safety Input Devices
The Base Controller has 26 input terminals that can be used to monitor either safety or non-safety devices; these devices
may incorporate either solid-state or contact-based outputs. Some of the input terminals can be configured to either
source 24 V dc for monitoring contacts or to signal the status of an input or an output. The function of each input circuit
depends on the type of the device connected; this function is established during the controller configuration.
The expansion modules XS8si and XS16si add additional inputs to the Safety Controller System.
Contact Banner Engineering for additional information about connecting other devices not described in this manual.
2.7.2 Safety Outputs
The Safety Outputs are designed to control Final Switching Devices (FSDs) and Machine Primary Control Elements (MPCEs)
that are the last elements (in time) to control the dangerous motion. These control elements include relays, contactors,
solenoid valves, motor controls, and other devices that typically incorporate force-guided (mechanically-linked) monitoring
contacts, or electrical signals needed for external device monitoring. These features are typically used to detect external
device failures.
The Safety Controller has two independently controlled and redundant solid-state Safety Outputs (terminals SO1a & SO1b,
and SO2a & SO2b). The controller’s self-checking algorithm ensures that the outputs turn On and Off at the appropriate
times, in response to the assigned input signals.
Each redundant solid-state Safety Output is designed to work either in pairs or as two individual outputs. When controlled
in pairs, the Safety Outputs are suitable for Category 4 applications; when acting independently, they are suitable for
applications up to Category 3 when appropriate fault exclusion has been employed (see Single-channel Control in Safety
(Protective) Stop Circuits on page 92 and Safety Circuit Integrity and ISO 13849-1 Safety Circuit Principles on page
68). See Safety Outputs on page 84 for more information about hookup, solid-state and safety relay outputs, external
device monitoring, single/dual-channel Safety Stop Circuits, and configuring Safety Outputs.
Additional solid-state or safety relay outputs can be added to expandable models (XS26-2xx) of the Base Controller by
incorporating expansion output modules (XS2so, XS4so, XS1ro, and XS2ro). Up to eight expansion modules, in any
combination of input or output modules, can be added.
The Safety Outputs can be controlled by input devices with both automatic and manual reset operation.
Figure 2. Safety Outputs (example application)
XS/SC26-2 Safety Controller
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