SWAGELOK PFA-820-3

SWAGELOK PFA-820-3

SWAGELOK PFA-820-3

講到PLC與編碼器的連接，很多人就立刻想到了高速計(jì)數(shù)，高速計(jì)數(shù)僅僅是針對(duì)于增量型編碼器的方波脈沖信號(hào)，對(duì)于值編碼器實(shí)際上無需計(jì)數(shù)累加，“高速計(jì)數(shù)”已沒有意義。而即使是增量的方波脈沖信號(hào)，也有很多技術(shù)特征不同，PLC使用人員在選擇編碼器時(shí)必須分辨清楚：
1)，5V差分驅(qū)動(dòng)信號(hào)，編碼器特征是工作電壓是5V，ABZ信號(hào)輸出線有6根：A+,A-；B+,B-；Z+,Z-。注意A-是相對(duì)于A+的反相（就是當(dāng)A+為高電平，A-就是低電平，當(dāng)A+為低電平，A-就是高電平），有時(shí)也有是在A的頭上加一個(gè)橫線表示。
含反相信號(hào)的優(yōu)點(diǎn)是抗干擾能力強(qiáng)，傳輸距離遠(yuǎn)，因?yàn)槊}沖信號(hào)是電壓信號(hào)，A+，A-互為反相兩個(gè)線纜雙絞在一起，從電纜外部看幾乎都沒有“變化”了，沒有電磁場(chǎng)的波也就不易受外部電磁場(chǎng)的影響，即使有干擾影響，在接收端的“差分”（“差”就是做減法的意思）后消除了共模干擾。但是5V信號(hào)電壓偏低，對(duì)于較大型電機(jī)和較復(fù)雜的現(xiàn)場(chǎng)工控就不適合，目前主要用戶是伺服電機(jī)等小型化設(shè)備中，PLC大都不用（如有運(yùn)動(dòng)控制卡的會(huì)用此信號(hào)接口）。
在歐系產(chǎn)品的有些說明書里面，這個(gè)信號(hào)有時(shí)會(huì)用TTL表示，但是在國(guó)際RS422標(biāo)準(zhǔn)出來推廣以后，逐漸的也有用RS422表示，并且有些RS422的信號(hào)做到的是5--24V。
ROSEMOUNT 3051S1CG3A2A11A1AE5  
ROSEMOUNT 3051S1CD5A2F12A1AE5 
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/8" NPT HOBREWING  <717WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 2" NPT HOBREWING  <718WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/4" NPT HOBREWING  <711WH
2-1/2" LONG RADIUS 90 DEGREE ELBOW SCHEDULE 40 BUTTWELD WPB PIPE FITTING <007WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1" NPT HOBREWING  <712WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3" NPT HOBREWING  <720WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/4" NPT HOBREWING  <715WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/2" NPT HOMW BREWING  <716WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/4" NPT HOBREWING  <714WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/2" NPT HOBREWING  <710WH
FORGED STEEL 2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING  <FS2009
FORGED STEEL 1" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING  <FS2006
FORGED STEEL 1/2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2004
90 DEGREE STREET ELBOW 150# 304 STAINLESS 1/4" NPT HOBREWING  <820WH
90 DEGREE STREET ELBOW 150# 304 STAINLESS 1/2" NPT HOBREWING  <822WH
90 DEGREE STREET ELBOW 150# 304 STAINLESS 1" NPT HOBREWING  <824WH
90 DEGREE STREET ELBOW 150# 304 STAINLESS 1-1/4" NPT HOBREWING  <826WH
90 DEGREE STREET ELBOW 150# 304 STAINLESS 3/8" NPT HOBREWING  <821WH
90 DEGREE STREET ELBOW 150# 304 STAINLESS 2" NPT HOBREWING  <828WH
FORGED STEEL 1-1/4" 3000# THREADED 90 DEGREE ELBOW A105 PIPE FITTING  <FS1007
FORGED STEEL 2" 3000# THREADED 90 DEGREE ELBOW A105 PIPE FITTING  <FS1009
90 DEGREE STREET ELBOW 150# 304 STAINLESS 1-1/2" NPT HOBREWING  <827WH
PISCES OPW STREET ELBOW PFL-150 1 1/2" X 1 1/2" <061P1
PISCES OPW STREET ELBOW PFL-215 1-1/2 npt X 2"NFSM  <062P1
90 DEGREE 3/4" NPT STREET ELBOW 150# 304 STAINLESS STEEL HOBREW ING <823WH
2" Schedule 10 Long Radius Butt Weld 90° Elbow 304/L Stainless Steel <529WH
1-1/4" Schedule 10 Long Radius Butt Weld 90° Elbow 304/L Stainless Steel <527WH
1" Schedule 10 Long Radius Butt Weld 90° Elbow 304/L Stainless Steel <526WH
1-1/4" LONG RADIUS 90 DEGREE ELBOW SCHEDULE 40 BUTTWELD PIPE FITTING WPB <003WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 4" NPT BREWING PIPE PLUG  <891.WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 3" NPT BREWING PIPE PLUG  <890WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 2-1/2" NPT BREWING PIPE  <889WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 2" NPT BREWING PIPE PLUG  <888WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1-1/2" NPT BREWING PIPE  <887WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1-1/4" NPT BREWING PIPE  <886.WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1" NPT BREWING PIPE PLUG  <885WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 3/4" NPT BREWING PIPE PLUG  <884WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 3/8" NPT BREWING PIPE PLUG  <882WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1/4" NPT BREWING PIPE PLUG  <881WH