CAUTION: Adjustable Valve Monitoring (AVM) Operation
When an input is configured with automatic reset logic and is quickly cycled (from Run to Stop to Run),
the Safety Output(s) will not turn ON until the AVM input is satisfied. This could result in an On-
Delay up to the configured AVM monitoring time.
The user is responsible to make sure that the AVM monitoring time is properly configured for
the application and to instruct all individuals associated with the machine about the
possibility of the On-Delay effect, which may not be readily apparent to the machine operator
or other personnel.
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 are 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.
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.
Mute Enable Switch: signals the 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.
Cancel Off-Delay Devices: provide the option to cancel a configured Off-delay time. It functions in one of the following
ways:
•
Keeps the safety output On
•
Turns the safety output Off immediately after the Controller receives a Cancel Off-Delay signal
•
When Cancel Type is set to "Control Input", the 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.
Table 3: Cancel Off-Delay Timing
Off Delay
Time Limit
1
Note 1 - If “turn output off” function is selected
Safety Inputs
Cancel Delay Input
SO1
Figure 61. Safety Input remains in Stop mode
0.5 sec.
Safety Inputs
Cancel Delay Input
SO1
Off Delay
Time Limit
Figure 62. Turn Output Off function
XS/SC26-2 Safety Controller
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