Honeywell CIU 888 Configuration Manual page 214

Appendix C - Redundancy
Configure Number of States as 2 and configure state Descriptors as
State 1="ON" and State 0="OFF". This will be used in Server scripting
for executing automatic switchover from Experion PKS.
In the Scripts Tab under HOTSTANDBYSTATUS status point, click on
Create New or Edit existing server scripts.
"Configure Event as OnChange.
"Configure Script Engine as Automatically Allocate
"Configure Parameter as PV.
"Copy the below script to the script editor.
if ucase(ParamValue("HOTSTANDBYSTATUS.PV"))= ucase("ON")
then
ParamValue("SWITCHOVERCOMMAND.OP")= ucase("ON")
end if
NOTE: This script will check the Hotstandby Status periodically
(HOTSTANDBYSTATUS.PV) and whenever it changes to ON (which indicates
CIU 888 as PASSIVE), a switchover command
Part No.: 4417584_Rev12 Configuration Manual
CIU 888 C - 28