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6.5 Non-Safety Input Devices
The non-safety input devices include manual reset devices, On/Off switches, mute enable devices, and cancel delay inputs.
Manual Reset Devices—Used to create a reset signal for an output or function block configured for a manual reset,
requiring an operator action for the output of that block to turn on. Resets can also be created using virtual reset input; see
Virtual Non-Safety Input Devices
WARNING: Non-Monitored Resets
If a non-monitored reset (either latch or system reset) is configured and if all other conditions for a reset
are in place, a short from the Reset terminal to +24 V will turn On the safety output(s) immediately.
ON/Off Switch—Provides an On or Off command to the machine. When all of the controlling safety inputs are in the Run
state, this function permits the safety output to turn On and Off. This is a single-channel signal; the Run state is 24 V dc and
the Stop state is 0 V dc. An On/Off input can be added without mapping to a safety output, which allows this input to
control only a status output. An On/Off switch can also be created using a virtual input; see
Devices
on p. 37.
Mute Enable Switch—Signals the Safety Controller when the mute sensors are permitted to perform a mute function.
When the mute enable function is configured, the mute sensors are not enabled to perform a mute function until the mute
enable signal is in the Run state. This is a single-channel signal; the enable (Run) state is 24 V dc and the disable (Stop)
state is 0 V dc. A mute enable switch can also be created using a virtual input; see
p. 37.
Cancel Off-Delay Devices—Provide the option to cancel a configured Off-delay time of a safety output or a delay block
output. It functions in one of the following ways:
•
Keeps the safety output or delay block output On
•
Turns the safety output or delay block output Off immediately after the Safety Controller receives a Cancel Off-Delay
signal
•
When Cancel Type is set to "Control Input", the safety output or delay block output stays on if the input
turns On again before the end of the delay
A status output function (Output Delay in Progress) indicates when a Cancel Delay Input can be activated in order to keep
the Off-delayed safety output On. A cancel off-delay device can also be created using a virtual input; see
Input Devices
on p. 37.
Cancel Off-Delay Timing
Figure 11: Safety Input remains in Stop mode
on p. 37.
www.bernstein.eu
Programmable Safety Controller SCR P
Virtual Non-Safety Input Devices
Figure 12: Turn Output Off function
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Virtual Non-Safety Input
on
Virtual Non-Safety
35
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