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<== Date ==> <== Thread ==>
Subject: initializing a constant pv at startup
From: "Tran, Phi Dung via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Tue, 21 Nov 2023 14:54:58 +0000
Hi,

I am using a soft channel $(P) in one IOC to control three real motors in another IOC.
I attempted to initialize a PV, $(P)-DSI, at startup. Then, this PV should remain constant.
When $(P)-DM was processed, it has this NPP input link field to the $(P)-DSI,
field(INPB,"$(P)-DSI.VAL NPP NMS").

My $(P)-DSI was also processed to be the same as $(DOWNSTREAMMTR).VAL.  Therefore, the $(P)-DSI did not remain constant.  How do I fix problem by replacing CPP?  I tried PP and got zero for default.

Below are my records and trace
record(calc,"$(P)-DSI"){
    field(DESC,"initial downstream")
    field(INPA,"$(DOWNSTREAMMTR).VAL CPP MS")
    field(CALC,"a")
    field(PINI,"YES") #move motors
}

record(calcout,"$(P)-DM"){
    field(INPA,"$(P).VAL NPP MS")
    field(INPB,"$(P)-DSI.VAL NPP NMS")
    field(CALC,"a+b")
    field(OUT,"$(DOWNSTREAMMTR).VAL PP MS ")
}

ca:ptran1 at xf19id2-ws3.nsls2.bnl.local: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr'
ca:ptran1 at xf19id2-ws3.nsls2.bnl.local: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-FF'
ca:ptran1 at xf19id2-ws3.nsls2.bnl.local: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-OM'
ca:ptran1 at xf19id2-ws3.nsls2.bnl.local: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-IM'
ca:ptran1 at xf19id2-ws3.nsls2.bnl.local: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-DM'
scanOnce: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-OBI'
scanOnce: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-IBI'
scanOnce: dbProcess of 'XF:19IDC-ES-G0{Ymove}Mtr-DSI'

Thanks,
Phi

Attachment: galil0_Ymove_ib_ob_ds.db
Description: galil0_Ymove_ib_ob_ds.db

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