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Rockwell Automation Publication 35-UM001A-EN-P - May 2022
Chapter 6 Safety Functions
Figure 60 - Complementary, Normal Operation and Fault Detection (not to scale)
Input Delays
Each safety input has a configurable filter time for sampling the input. Both
the on
off and off
on filter values can be configured.
Off to On Delay
On-delay—An input signal is treated as Logic 0 during the on-delay time
(0…65,535 ms, in increments of 1 ms) after the rising edge of the input contact.
The input turns on only if the input contact remains on after the on delay time
has elapsed. This setting helps prevent rapid changes of the input data due to
contact bounce.
Figure 61 - On-delay
ON
OFF
Safety Input 0
Terminal
Normal Operation
ON
OFF
Safety Input 1
Terminal
ON
OFF
Safety Input 0
Value
ON
OFF
Safety Input 1
Value
OK
ALARM
Dual Channel
Status
ON
OFF
Safety Input 0
Terminal
ON
OFF
Safety Input 1
Terminal
ON
OFF
Safety Input 0
Value
OK
ALARM
Dual Channel
Status
ON
OFF
Safety Input 1
Value
Discrepancy
Time
Alarm Detected
Alarm Operation
Discrepancy
Time
On-delay
ON
OFF
ON
OFF
Input Signal
Safety Input
Network Data
