hi, all:
I am trying to use the record suggested by Ned Arnold. It's good work when increment is 1. but when I change to 0.1, it has a strange problem. the db file is like following:
record(ai, "$(user):aiExample")
{
field(DESC, "Analog input")
field(INP, "$(user):calcExample.VAL NPP NMS")
}
record(calc, "$(user):calcExample")
{
field(DESC, "Counter")
field(SCAN,"1 second")
field(FLNK, "$(user):aiExample")
field(CALC, "A-B>0?A>=0.9?0.8:A+0.1:A<0.1?0.1:A-0.1")
field(INPA, "$(user):calcExample.VAL NPP NMS")
field(INPB, "$(user):calcExample.LA NPP NMS")
field(EGU, "Counts")
}
Following is dbtr message, we can see when the value change to 0.1, after caculation, it's value change to VAL: 1.38777878078145e-16, can anyone give some suggestion? thanks a lot in advance.
epics> dbtr tcl:calcExample
A: 0.2 ACKS: NO_ALARM ACKT: YES ADEL: 0
ALST: 0.1 ASG: B: 0.3 BKPT: 0x00
C: 0 CALC: A-B>0?A>=0.9?0.8:A+0.1:A<0.1?0.1:A-0.1
D: 0 DESC: Counter DISA: 0 DISP: 0
DISS: NO_ALARM DISV: 1 DTYP: <nil> E: 0
EGU: Counts EVNT: 0 F: 0
FLNK:DB_LINK tcl:aiExample G: 0 H: 0
HHSV: NO_ALARM HIGH: 0 HIHI: 0 HOPR: 0
HSV: NO_ALARM HYST: 0 I: 0
INPA:DB_LINK tcl:calcExample.VAL NPP NMS
INPB:DB_LINK tcl:calcExample.LA NPP NMS INPC:CONSTANT INPD:CONSTANT
INPE:CONSTANT INPF:CONSTANT INPG:CONSTANT INPH:CONSTANT
INPI:CONSTANT INPJ:CONSTANT INPK:CONSTANT INPL:CONSTANT
J: 0 K: 0 L: 0 LA: 0.2
LALM: 0.1 LB: 0.3 LC: 0 LCNT: 0
LD: 0 LE: 0 LF: 0 LG: 0
LH: 0 LI: 0 LJ: 0 LK: 0
LL: 0 LLSV: NO_ALARM LOLO: 0 LOPR: 0
LOW: 0 LSV: NO_ALARM MDEL: 0 MLST: 0.1
NAME: tcl:calcExample NSEV: NO_ALARM NSTA: NO_ALARM
PACT: 0 PHAS: 0 PINI: NO PREC: 0
PRIO: LOW PROC: 0 PUTF: 0 RPRO: 0
SCAN: 1 second SDIS:CONSTANT SEVR: NO_ALARM STAT: NO_ALARM
TPRO: 0 TSE: 0 TSEL:CONSTANT UDF: 0
VAL: 0.1
epics> dbtr tcl:calcExample
A: 0.1 ACKS: NO_ALARM ACKT: YES ADEL: 0
ALST: 1.38777878078145e-16 ASG: B: 0.2
BKPT: 0x00 C: 0
CALC: A-B>0?A>=0.9?0.8:A+0.1:A<0.1?0.1:A-0.1 D: 0
DESC: Counter DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1 DTYP: <nil> E: 0 EGU: Counts
EVNT: 0 F: 0 FLNK:DB_LINK tcl:aiExample
G: 0 H: 0 HHSV: NO_ALARM HIGH: 0
HIHI: 0 HOPR: 0 HSV: NO_ALARM HYST: 0
I: 0 INPA:DB_LINK tcl:calcExample.VAL NPP NMS
INPB:DB_LINK tcl:calcExample.LA NPP NMS INPC:CONSTANT INPD:CONSTANT
INPE:CONSTANT INPF:CONSTANT INPG:CONSTANT INPH:CONSTANT
INPI:CONSTANT INPJ:CONSTANT INPK:CONSTANT INPL:CONSTANT
J: 0 K: 0 L: 0 LA: 0.1
LALM: 1.38777878078145e-16 LB: 0.2 LC: 0
LCNT: 0 LD: 0 LE: 0 LF: 0
LG: 0 LH: 0 LI: 0 LJ: 0
LK: 0 LL: 0 LLSV: NO_ALARM LOLO: 0
LOPR: 0 LOW: 0 LSV: NO_ALARM MDEL: 0
MLST: 1.38777878078145e-16 NAME: tcl:calcExample
NSEV: NO_ALARM NSTA: NO_ALARM PACT: 0 PHAS: 0
PINI: NO PREC: 0 PRIO: LOW PROC: 0
PUTF: 0 RPRO: 0 SCAN: 1 second SDIS:CONSTANT
SEVR: NO_ALARM STAT: NO_ALARM TPRO: 0 TSE: 0
TSEL:CONSTANT UDF: 0 VAL: 1.38777878078145e-16
epics> dbtr tcl:calcExample
A: 1.38777878078145e-16 ACKS: NO_ALARM ACKT: YES
ADEL: 0 ALST: 0.1 ASG: B: 0.1
BKPT: 0x00 C: 0
CALC: A-B>0?A>=0.9?0.8:A+0.1:A<0.1?0.1:A-0.1 D: 0
DESC: Counter DISA: 0 DISP: 0 DISS: NO_ALARM
DISV: 1 DTYP: <nil> E: 0 EGU: Counts
EVNT: 0 F: 0 FLNK:DB_LINK tcl:aiExample
G: 0 H: 0 HHSV: NO_ALARM HIGH: 0
HIHI: 0 HOPR: 0 HSV: NO_ALARM HYST: 0
I: 0 INPA:DB_LINK tcl:calcExample.VAL NPP NMS
INPB:DB_LINK tcl:calcExample.LA NPP NMS INPC:CONSTANT INPD:CONSTANT
INPE:CONSTANT INPF:CONSTANT INPG:CONSTANT INPH:CONSTANT
INPI:CONSTANT INPJ:CONSTANT INPK:CONSTANT INPL:CONSTANT
J: 0 K: 0 L: 0
LA: 1.38777878078145e-16 LALM: 0.1 LB: 0.1
LC: 0 LCNT: 0 LD: 0 LE: 0
LF: 0 LG: 0 LH: 0 LI: 0
LJ: 0 LK: 0 LL: 0 LLSV: NO_ALARM
LOLO: 0 LOPR: 0 LOW: 0 LSV: NO_ALARM
MDEL: 0 MLST: 0.1 NAME: tcl:calcExample
NSEV: NO_ALARM NSTA: NO_ALARM PACT: 0 PHAS: 0
PINI: NO PREC: 0 PRIO: LOW PROC: 0
PUTF: 0 RPRO: 0 SCAN: 1 second SDIS:CONSTANT
SEVR: NO_ALARM STAT: NO_ALARM TPRO: 0 TSE: 0
TSEL:CONSTANT UDF: 0 VAL: 0.1
epics>
Best regards
Geyang 2008-11-23
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