ABB AC500-S Safety User Manual page 90

AC500-S safety modules
DX581-S safety digital input/output module > Functionality
Fig. 39: 2 channel antivalent mode implemented in DX581-S
DX581-S contains 8 safety digital output channels with the following features:
● Internal output channel tests can be switched off.
90
NOTICE!
2 channel equivalent and 2 channel antivalent modes are implemented in
DI581-S and DX581-S module to handle relatively static safety signals, e.g.,
those for emergency stop devices.
If frequently changing signals, like those from light curtains, laser scanners,
door switches, etc. must be handled by DI581-S and DX581-S, then it is highly
recommended to use input delay of 1 ms for these channels or to configure
related channels in 1 channel mode and do 2 channel equivalent and 2 channel
antivalent evaluation at the safety CPU using PLCopen Safety FBs SF_Equiva-
Ä Chapter 4.6.4.2 "SF_Equivalent" on page 195 and SF_Antivalent
lent
Ä Chapter 4.6.4.3 "SF_Antivalent" on page 200.
3ADR025091M0208, 12, en_US 2020/06/19