Delta ASD-A2-0121 Series User Manual page 158

ASDA-A2
Example of not latching:

If Logic C P2-93 is set to XX12, the FDBK status is closed when the safety signal is lost and
AL500 occurs.
1. Since FDBK is selected as No Latch, when the safety signals return to normal, the FDBK
status automatically changes from short-circuited to normal when AL500 occurs. Setting
P2-93 to XX12 again is not required.
2. After the FDBK status is restored, you can clear the alarms by the normal corrective actions.
In this case, you can clear AL500 by DI.Alm Reset.
Relevant parameter (Please refer to Chapter 8 for detailed information):
Parameter
P2-93
Function
STO FDBK Control
Chapter 3 Wiring
3-93