LBSM4112900現(xiàn)貨
福州聚福興自動(dòng)化有限公司
公司理念:做思想巨人,做行動(dòng)的鐵人,奉行把個(gè)人的發(fā)展與公司的發(fā)展做到有機(jī)的結(jié)合的共同價(jià)值觀。我們發(fā)揮公司多年積累的優(yōu)勢(shì)與有利條件,以效益為中心,以改革促發(fā)展,以創(chuàng)新求進(jìn)步,加快發(fā)展步伐,逐步實(shí)現(xiàn)“創(chuàng)造大眾的信心與價(jià)值,造福于大眾富裕與安寧”的公司長(zhǎng)期發(fā)展愿景。
(1) 功能塊FC實(shí)參的指針存到調(diào)用塊的L堆棧;
(2) 調(diào)用塊的地址和返回位置存儲(chǔ)在塊堆棧,調(diào)用塊的局部數(shù)據(jù)壓入L堆棧;
(3) 功能塊存儲(chǔ)臨時(shí)變量的L堆棧區(qū)被推入L堆棧上部;
(4) 當(dāng)被調(diào)用功能塊FC結(jié)束時(shí),先前塊的信息存儲(chǔ)在塊堆棧中,臨時(shí)變量彈出L堆棧。
因?yàn)楣δ軌KFC不用背景數(shù)據(jù)塊,不能分配初始數(shù)值給功能塊FC的局部數(shù)據(jù),所以必須給功能塊FC提供實(shí)參。
STEP 7為功能塊FC提供了一個(gè)特殊的返回值輸出參數(shù)(關(guān)鍵字:RET_VAL)。當(dāng)在文本文件中創(chuàng)建功能塊FC時(shí),你可以在定義功能塊FC命令后輸入數(shù)據(jù)類型(如BOOL或INT)。對(duì)文本文件進(jìn)行編譯時(shí),STEP 7會(huì)自動(dòng)生成RET_VAL輸出參數(shù)。當(dāng)用STEP 7的程序編輯器(Program Editor)以增量模式創(chuàng)建功能塊FC時(shí),可在FC的變量聲明表中聲明一個(gè)輸出參數(shù)RET_VAL,并指明其數(shù)據(jù)類型。
功能塊編程與調(diào)用舉例
對(duì)功能塊編程分兩步進(jìn)行:步是定義局部變量(填寫(xiě)局部變量表);第二步是編寫(xiě)要執(zhí)行的程序,可以用梯形圖或語(yǔ)句表兩種形式編程,并在編程過(guò)程中使用定義了的局部變量(數(shù)據(jù))。
定義局部變量的工作內(nèi)容包括:
(1) 分別定義形參、靜態(tài)變量和臨時(shí)變量(FC塊中不包括靜態(tài)變量);
(2) 確定各變量的聲明類型(Decl.)、變量名(Name)和數(shù)據(jù)類型(Data Type),還要為變量設(shè)置初始值(Initial Value)(盡管對(duì)有些變量初始值不一定有意義)。如果需要還可為變量注釋(Comment)。在增量編程模式下,STEP 7將自動(dòng)產(chǎn)生局部變量地址(Address)。
寫(xiě)功能塊程序時(shí),可以用以下兩種方式使用局部變量:
(1) 使用變量名,此時(shí)變量名前加前綴“#”,以區(qū)別于在符號(hào)表中定義的符號(hào)地址。增量方式下,前綴會(huì)自動(dòng)產(chǎn)生。
(2) 直接使用局部變量的地址,這種方式只對(duì)背景數(shù)據(jù)塊和L堆棧有效。
在調(diào)用FB塊時(shí),要說(shuō)明其背景數(shù)據(jù)塊。背景數(shù)據(jù)塊應(yīng)在調(diào)用前生成,其順序格式與變量聲明表必須保持一致。在增量方式下,調(diào)用FB塊時(shí),STEP 7會(huì)自動(dòng)提醒并生成背景數(shù)據(jù)塊。此時(shí)也為背景數(shù)據(jù)塊設(shè)置了初始值,該初始值與變量聲明表中的相同。當(dāng)然也可以為背景數(shù)據(jù)塊設(shè)置當(dāng)前值(Current Value),即存儲(chǔ)在CPU中的數(shù)值。
1.二分頻器
假設(shè)功能塊FC10是二分頻器產(chǎn)生程序,功能是對(duì)不同的輸入位進(jìn)行二分頻處理。以下給出了FC10的變量聲明表和語(yǔ)句表程序。在程序中使用了跳變沿檢測(cè)指令。
1) FC10的變量聲明表(見(jiàn)表5.3)
IDEC APW199DY USPP APW199DY
APW MCLEAN TEG10 NSPP TEG10
APW MCLEAN TEG10 USPP TEG10
IDEC APW299D-S-24V NSPP APW299DS24V
IDEC APW-299D-R-120?V NSPP APW299DR120V
TEXAS INSTRUMENTS SEMI SN74LVCC3245AP?W FNFP SN74LVCC3245AP?W
IDEC APW-199R24V USPP APW199R24V
IDEC APW299D-A-24V USPP APW299DA24V
IDEC APW299D-Y-24V NSFP APW299DY24V
IDEC APW299D-Y-24V USPP APW299DY24V
IDEC APW1126S USPP APW1126S
IDEC APW-199 NSFP APW199
IDEC APW-199 NSPP APW199
IDEC APW-199 USPP APW199
IDEC APW199D-A-120V NSFP APW199DA120V
IDEC APW199D-A-120V NSPP APW199DA120V
IDEC APW199D-A-120V USPP APW199DA120V
IDEC APW199D-G-120V NSFP APW199DG120V
IDEC APW199D-G-24V NSFP APW199DG24V
IDEC APW199D-G-24V USPP APW199DG24V
IDEC APW199D-R-120V NSFP APW199DR120V
IDEC APW199D-R-120V NSPP APW199DR120V
IDEC APW199D-R-120V USPP APW199DR120V
IDEC APW199D-R-24V NSFP APW199DR24V
IDEC APW199D-R-24V USPP APW199DR24V
IDEC APW199D-S-24V NSFP APW199DS24V
IDEC APW199D-W-120V NSFP APW199DW120V
IDEC APW199D-W-120V USPP APW199DW120V
IDEC APW199-G-120V NSFP APW199G120V
IDEC APW199-G-120V USPP APW199G120V
IDEC APW2126G USPP APW2126G
IDEC APW299D-G-120V NSFP APW299DG120V
IDEC APW299D-G-120V NSPP APW299DG120V
IDEC APW299D-G-120V USPP APW299DG120V
IDEC APW-299D-R-120?V NSFP APW299DR120V
IDEC APW-299D-R-120?V USPP APW299DR120V
IDEC APW299D-W-120V NSFP APW299DW120V
IDEC APW299D-W-120V USPP APW299DW120V
IDEC APW2LD-G NSFP APW2LDG
IDEC APW299-E-R-120?V NSPP APW299ER120V
IDEC APW299-E-R-24V NSPP APW299ER24V
IDEC APW299DW6V USPP APW299DW6V
IDEC APW1126D-A NSFP APW1126DA
IDEC APW1126D-A USPP APW1126DA
TEXAS INSTRUMENTS SEMI SN74LVCC4245AP?W FNFP SN74LVCC4245AP?W
LBSM4112900
Eye Chart software, visual acuity software. NEW
DIGITAL ACUITY SOFTWARE with Patient Education Pic/Vids
Visual Acuity Eye Chart software. NEW
RVSI ACUITY CM400 CCTV CAMERA
Juno Systems RV123/RV123P Binocular Vision/Acuity Screener w Stand
Acuity CiMatrix CM4000 B/W CCD Camera, super miniture
ADEPT TECH 30332-22350 USPP 3033222350
ADEPT TECH 90400-11140/XY?-HRS-140AH404 USPP 9040011140XYHR?S1
ADEPT TECH 10332-00716 USPP 1033200716
ADEPT TECH 10332-00714 USPP 1033200714
ADEPT TECH 30330-25000 USPP 3033025000
ADEPT TECH 90400-11180/XY?-HRS-180AH404A?D
ADEPT TECH 90400-11200/XY?-HRS-200AH404A?D
ADEPT TECH 10330-00710 USPP 1033000710
ADEPT TECH 30336-31000 USPP 3033631000
ADEPT TECH 10332-00655 USPP 1033200655
ADEPT TECH PA-4 USPP PA4
ADEPT TECH 30330-15000 USPP 3033015000
ADEPT TECH 10171-00020 USPP 1017100020
ADEPT TECH 10332-44710 USPP 1033244710
ADEPT TECH 10330-00600 USPP 1033000600
NIB ADEPT TECH 30340-40100 CONTROLLER CHASSIS MV-10
ADEPT TECH 10350-01064 USPP 1035001064
ADEPT TECH 10350-01044 NSFP 1035001044
ADEPT TECH 90400-30013 USPP 9040030013
ADEPT TECH 90402-40013 USPP 9040240013
ADEPT TECH 90402-40013/XY?-HRS013-S1B1-A?D USPP 9040240013XYHR?S0
ADEPT TECH 10330-15350 USPP 1033015350
ADEPT TECH 30330-12000 USPP 3033012000
ADEPT TECH 30340-40000 USPP 3034040000
ADEPT TECH 30340-20000 USPP 3034020000
LBSM4112900
AMETEK SD0521800 *NEW IN BAG*
AMETEK 949-002L12 *NEW IN BAG*
Ametek Arc-Loc 1x597 60PSI 4 1/2" PSI Gauge 150970 NIB
AMETEK L65296LG *NEW IN BOX*
Ametek - P-25A-5K Linear Motion Transducer
LOT OF 2 AMETEK 163280 GAUGE 100 PSI 2-1/2'' P505A
NEW AMETEK J-87 PRESSURE GAUGE 1/4 LM 160# 2 1/4 FIG. P 500 GAGE 48365 J87
AMETEK BU-2457-H PRESSURE GAGE SPEC 47495
AMETEK 3189-15-S 0-15PSI 3 1/2 PRESSURE GAUGE, NIB
Ametek green rectangular lid no lip 13"x18"x2"
NEW-AMETEK DISTRIBUTOR CAP-QUICKSILVE?R #392-9086T
Ametek green rectangular lid 14"x19 1/2x2"
AMETEK P508 GAGE *NEW*
NEW AMETEK 4 1/2" GAUGE 30-0-30 1/2" NPT FIG. 1981
Ametek P781642 Gauge 0-160 PSI / 0-1100 kPa
AMETEK U.S. GAGES 163270 GAUGES P-500 160 PSI 1/4 NPT
NEW USG AMETEK 0-30 MA NPT GAUGE SS HIGH PURITY
AMETEK, P601K, WELDING GAUGE, 0-4000 PSI, 1/4" NPT, NNB
AMETEK 1981 *NEW IN A BOX*
NEW AMETEK 200 PSI GAUGE- CONN. 1/4 ANPT LM,SIZE 4 1/2
USG Ametek 2" P-844U General Purpose Gauge 0-100 psi 1/8" NPT 164419 138004
AMETEK 047495 2 1/2" 1/4" NPT 60 PSI PRESSURE GAUGE, NEW
AMETEK USG GAUGE 146261A 1-1/2” V562UK 1/8NPT
NEW Ametek Pittman 8712 DC Gearmotor Brush Motor w/ 60.5:1 Gearbox 19.1VDC
Ametek 5801 Gauge 60PSI B22 132617 NEW
Ametek Gauge Double Spring AD-9913 Fig No. 7288-A Spec No. 120760 1-1000 1/4LM
Ametek green rectangular lid t-top-no clips 10"x16"x2
2-Pack Ametek Kleen-Plus Sediment Water Filters P5 Klean Plus Clean NEW
AMETEK 150018 *NEW IN A BOX*
2 – AMETEK GAUGE 146009 2000PSI 1/8ANPT
Ametek USG Gauge - Industrial Grade NOS - 1/4" NPT - Steampunk
Ametek 1535 Pressure Gauge 148955 30 Psi 1/4"
AMETEK USG 1559 2.5" 60# 1/4"CBM FILLABLE GAUGE 167202
Lloyd/AMETEK Nexgen Gauge User's Manual SHIPS FREE!
Ametek P781642 Gauge 160PSI 1/4 NPT
AMETEK CENTIGRADE MODEL DT-8320 DIGITAL THERMOMETER
NEW AMETEK 3-1/2" GAUGE 1361 0-1200 POUNDS 1/4" NPT
AMETEK 6X830 **NIB**
Caterpillar Forklift Starter Relay Ametek Prestolite Switch # 9192004900
LBSM4112900
?
?
?
?