<Appendix 5. PID Block>
291
IM 01E21A02-03EN
A5.17.1 SHED_OPT
TheSHED_OPTsettingstipulatesthespecicationsofmodeshedding.
Available Setting for
SHED_OPT
Operation Contents
Normal shed, normal return SetsMODE_BLK.actualtoCas(*1),andleavesMODE_BLK.targetunchanged.
Normal shed, no return SetsbothMODE_BLK.ActualandMODE_BLK.TargettoCas(*1).
Shed to Auto, normal return SetsMODE_BLK.actualtoAuto(*2),andleavesMODE_BLK.targetunchanged.
Shed to Auto, no return SetsbothMODE_BLK.actualandMODE_BLK.targettoAuto(*2).
Shed to Manual, normal
return
SetsMODE_BLK.actualtoMan,andleavesMODE_BLK.targetunchanged.
Shed to Manual, no return SetsbothMODE_BLK.actualandMODE_BLK.targettoMan.
Shed to retained target,
normal return
1. IfCasisspeciedinMODE_BLK.target,setsMODE_BLK.actualtoCas(*1),
andleavesMODE_BLK.targetunchanged.
2. IfCasisnotspeciedinMODE_BLK.target,setsMODE_BLK.actualto
Auto(*2),andleavesMODE_BLK.targetunchanged.
Shed to retained target, no
return
1. IfCasisspeciedinMODE_BLK.target,setsbothMODE_BLK.Actualand
MODE_BLK.TargettoCas(*1).
2. IfCasisnotspeciedinMODE_BLK.target,setsMODE_BLK.actualto
Auto(*2),andMODE_BLK.targettoCas.
ThemodestowhichaPIDblockcantransferarelimitedtothosespeciedinMODE_BLK.
permitted.
The priority of block modes is as shown below.
Forthisreason,infact,(*1)transitionstoCas,Auto,orMAN,whicheverissetpermittedin
MODE_BLK.Permittedandhasthelowestprioritylevel.
FA0105.EPS
Higher priority
level
Lower priority
level
ROut RCas Cas Auto Man
(*2)isonlywhenAutoissetaspermittedmodebyMODE_BLK.Permitted.
Note: Due to initialization of the cascade connection, if the upstream is a control block, the
transition to the Cas mode occurs in the following sequence:
RCas/ROut -> Auto -> Cas