status outputs, the safety test pulses stay enabled even when designated as a status output. The Status Output signal
convention can be configured to be 24 V dc or 0 V dc. See
Status Output Signal Conventions
on page 59 for information
on the specific functions of a Status Output.
Ethernet models, using the Software, can be configured for up to 64 Virtual Status Outputs on FID 1 Base Controllers and
up to 256 virtual status outputs on FID 2 Base Controllers. These outputs can communicate the same information as the
status outputs over the network. See
on page 61 for more information.
WARNING:
• Status Outputs and Virtual Status Outputs are not safety outputs and can fail in either the On or
the Off state.
• If a Status Output or a Virtual Status Output is used to control a safety-critical application, a
failure to danger is possible and may lead to serious injury or death.
• Never use a Status Output or Virtual Status Output to control any safety-critical applications.
3.5
XS/SC26-2
Automatic Terminal Optimization (ATO) Feature
Automatic Terminal Optimization (ATO) is a standard feature on all XS/SC26-2 models. This feature automatically combines
up to two I/O terminals for two devices that r24 V test pulses from the Safety Controller. When applicable, the
Software automatically does this for every pair of devices that are added, until I/O terminals are no longer available. Sharing
is limited to two because the screw-type terminals are capable of accepting up to two wires.
Manually reassign terminals in the device properties window, if preferred.
The following figures illustrates the XS/SC26-2 ATO feature optimizing terminals for two gate switches. This results in a total
terminal usage of six, versus eight if it ATO is not utilized. The first gate switch (GS1) is added. This is a dual channel, four-
wire gate switch that requires two indep24 V pulsed outputs from the Safety Controller. IO1 is assigned as +24 V
test pulse 1 which runs through channel 1 of GS1 to IN1. IO2 is assigned as +24 V test pulse 2 which runs through channel
2 of GS1 to IN2. When the second gate switch GS2 is added, it also uses IO1 and IO2 but uses IN3 and IN4 to monitor its
two channels.
Figure 3. GS1 and GS2 Sharing IO1 and IO2
XS/SC26-2 and SC10-2 Safety Controllers
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