Mounting, Dimensions And Electrical Connection - ABB AC500-S Safety User Manual

Fig. 19: 2 channel antivalent mode implemented in DI581-S

3.3.3 Mounting, dimensions and electrical connection

The input modules can be plugged only on spring-type TU582-S I/O terminal unit. The unique
mechanical coding on I/O terminal units prevents a potential mistake of placing the non-safety
I/O module on safety I/O terminal unit and the other way around. Basic information on system
assembly is shown here. Detailed information can be found in
2020/06/19
DI581-S safety digital input module > Mounting, dimensions and electrical connection
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
AC500-S safety modules
Ä [4].
65