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編寫PC的通信程序可采用匯編語言編寫,或采用各種高級語言編寫,或采用工控組態(tài)軟件,或直接采用PLC廠家的通信軟件(如三菱的MELSE MEDOC等)
下面利用VB6.0以一個簡單的例子來說明編寫通信程序的要點(diǎn)。假設(shè)PC要求從PLC中讀入從D123開始的4個字節(jié)的數(shù)據(jù)(D123、D124),其傳輸應(yīng)答過程及報文如圖7-16所示。
PP2820 Cooller Cedes AG USL800 S24 100693
PP4283 Prozessregler SR27-4I-00000
TU992 Drehgeber Encoder Hohner 70 140 0BC OBC
HA558 Schucker SCA PCU 3000-20 CPU
PP1292 Frequenzumrichter MSF Vathauer FD 550
TU984 MKS Instruments Set Point MKS3001005B
ON401 Y38 VanDerLande VI-PPI 0L9196-00001
PP2115 Moxa Media Converter IMC-101-M-ST
PP7 Texas Instruments 505-4908
PP1979 Erhardt Leimer E&L LK 4002
HT155 Circuit board Elge EL.GE Milano DIS.0160749
HT177 Dynamic memory board Honeywell ISSC MM16 D 16 09
HT178 Multiplexer Honeywell ISSC MX3 D 16 09 052
HT180 Peripheral adapter Honeywell ISSC PA3 D16 09 050
HT181 Skip board Honeywell ISSC D 16 09 032 Rev B
HT182 Driver card Honeywell ISSC DR1 D 16 09 053 Rev G
PP1855 Steuerkarte Danfoss 175H1614 DT3 175H5390 175H16
PP2733 Barcode Scanner Microscan FIS-6300-0003G 0843588
DD159 Condition Koollsysteme Wurm CKW 34-051-4
PP3150 Auswertegert Innomess Mux 41/4
PP391 Handbediengert Topex 3000 K000344
ON197 Artis MTC-M1-2 MTC M1-2 Version 8.12
ON25 LED Flood Light 70x70mm Trilight 923 00
.HA723 Ultraschall Sensor Füllstand 3002490
PP962 Sicherheitsrelais Jokab Sefety JSE1 24V DC
PP965 Temperaturmessumformer MCR-T-UI
PP975 Contoller EZ-Zone Watlow RMAA-A3AA-AAAA
W738 Kniel KCD-24.1 Netzteil
W765 Atlas Copco Relay Interface ES01 19005911401
PP1980 Erhardt Leimer E&L RT 4011
KUKA KCP2 VKCP2KUKA KCP2 VKCP2KUKA KCP2 VKCP2