| Version 5 (modified by obina, 12 years ago) (diff) |
|---|
compress レコードの使い方
- 目的：ADCを0.1秒でSCANするとき、1秒間平均のデータをIOCで計算させたい
- 回答：compressレコードを使うのが簡単
- 詳細は https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Compressionを参照
例
10点のデータから計算するcompressレコードを作成(この例ではN to 1 Average)。INPレコードであるtest:janeは0.1秒ごとにプロセスするので、平均データは１秒ごとに更新される。
record(compress, "test:compAve")
{
field(DESC, "compress")
field(INP, "test:jane CP")
field(ALG, "N to 1 Average")
field(NSAM, "1")
field(N, "10")
field(SCAN, "Passive")
field(FLNK, "")
}
camonitor してみると、
pfrproc2:~ % camonitor test:compAve test:compAve 2012-06-04 22:08:31.000000 5.38322 test:compAve 2012-06-04 22:08:32.000000 5.30311 test:compAve 2012-06-04 22:08:33.000000 5.29409 test:compAve 2012-06-04 22:08:33.000000 5.29909
このままでは分かりにくいので、アルゴリズム(ALG)フィールドを "N to 1 Average", "N to 1 High Value", "N to 1 Low Value"の３パターンでどのようになるか グラフに描いてみる。それぞれ直前１０点のデータ区間の平均・最大・最小を値として持つことが分かる。
"N to 1 Average Value" 
"N to 1 High Value" 
"N to 1 Low Value" 
もし0.1秒ごとに更新する移動平均のデータが欲しいならば、まずCircular Bufferでスカラーからwaveformをつくる レコードを作成し、次いそのwaveform全体のAverageを計算するのが簡単。
aiのデータから、Circular Buffer（waveform）を作成する。
record(compress, "test:compCircBuf")
{
field(DESC, "compress")
field(INP, "test:jane CP")
field(ALG, "Circular Buffer")
field(NSAM, "10")
field(SCAN, "Passive")
field(FLNK, "")
}
pfrproc2:~ % camonitor test:compCircBuf test:compCircBuf 2012-06-04 22:08:11.000000 10 5.67032 5.5943 5.67055 5.72319 5.67128 5.76206 5.80883 5.87064 5.93594 5.84581 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.5943 5.67055 5.72319 5.67128 5.76206 5.80883 5.87064 5.93594 5.84581 5.74938 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.67055 5.72319 5.67128 5.76206 5.80883 5.87064 5.93594 5.84581 5.74938 5.66817 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.72319 5.67128 5.76206 5.80883 5.87064 5.93594 5.84581 5.74938 5.66817 5.6667 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.67128 5.76206 5.80883 5.87064 5.93594 5.84581 5.74938 5.66817 5.6667 5.57069 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.76206 5.80883 5.87064 5.93594 5.84581 5.74938 5.66817 5.6667 5.57069 5.49197 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.80883 5.87064 5.93594 5.84581 5.74938 5.66817 5.6667 5.57069 5.49197 5.41715 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.87064 5.93594 5.84581 5.74938 5.66817 5.6667 5.57069 5.49197 5.41715 5.47384 test:compCircBuf 2012-06-04 22:08:11.000000 10 5.93594 5.84581 5.74938 5.66817 5.6667 5.57069 5.49197 5.41715 5.47384 5.51437 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.84581 5.74938 5.66817 5.6667 5.57069 5.49197 5.41715 5.47384 5.51437 5.45423 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.74938 5.66817 5.6667 5.57069 5.49197 5.41715 5.47384 5.51437 5.45423 5.55247 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.66817 5.6667 5.57069 5.49197 5.41715 5.47384 5.51437 5.45423 5.55247 5.46537 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.6667 5.57069 5.49197 5.41715 5.47384 5.51437 5.45423 5.55247 5.46537 5.45961 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.57069 5.49197 5.41715 5.47384 5.51437 5.45423 5.55247 5.46537 5.45961 5.53298 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.49197 5.41715 5.47384 5.51437 5.45423 5.55247 5.46537 5.45961 5.53298 5.56679 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.41715 5.47384 5.51437 5.45423 5.55247 5.46537 5.45961 5.53298 5.56679 5.48265 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.47384 5.51437 5.45423 5.55247 5.46537 5.45961 5.53298 5.56679 5.48265 5.51005 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.51437 5.45423 5.55247 5.46537 5.45961 5.53298 5.56679 5.48265 5.51005 5.5402 test:compCircBuf 2012-06-04 22:08:12.000000 10 5.45423 5.55247 5.46537 5.45961 5.53298 5.56679 5.48265 5.51005 5.5402 5.62897
Attachments (3)
- comp_ex1_Nto1Ave.png (27.7 KB) - added by obina 12 years ago.
- comp_ex2_Nto1High.png (38.1 KB) - added by obina 12 years ago.
- comp_ex3_Nto1Low.png (29.3 KB) - added by obina 12 years ago.
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