在工業(yè)自動(dòng)化控制系統(tǒng)中,*為常見(jiàn)的是PLC和變頻器的組合應(yīng)用,并且產(chǎn)生了多種多樣的PLC控制變頻器的方法,其中采用RS-485通訊方式實(shí)施控制的方案得到廣泛的應(yīng)用:因?yàn)樗垢蓴_能力強(qiáng)、傳輸速率高、傳輸距離遠(yuǎn)且造價(jià)低廉。但是,RS-485的通訊必須解決數(shù)據(jù)編碼、求取校驗(yàn)和、成幀、發(fā)送數(shù)據(jù)、接收數(shù)據(jù)的奇偶校驗(yàn)、超時(shí)處理和出錯(cuò)重發(fā)等一系列技術(shù)問(wèn)題,一條簡(jiǎn)單的變頻器操作指令,有時(shí)要編寫數(shù)十條PLC梯形圖指令才能實(shí)現(xiàn),編程工作量大而且繁瑣,令設(shè)計(jì)者望而生畏。
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聯(lián)系人:李素云
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本文介紹一種非常簡(jiǎn)便的三菱FX系列PLC通訊方式控制變頻器的方法:它只需在PLC主機(jī)上安裝一塊RS-485通訊板或掛接一塊RS-485通訊模塊;在PLC的面板下嵌入一塊造價(jià)僅僅數(shù)百元的“功能擴(kuò)展存儲(chǔ)盒”,編寫4條極其簡(jiǎn)單的PLC梯形圖指令,即可實(shí)現(xiàn)8臺(tái)變頻器參數(shù)的讀取、寫入、各種運(yùn)行的監(jiān)視和控制,通訊距離可達(dá)50m或500m。這種方法非常簡(jiǎn)捷便利,極易掌握。本文以三菱產(chǎn)品為范例,將這種“采用擴(kuò)展存儲(chǔ)器通訊控制變頻器”的簡(jiǎn)便方法作一簡(jiǎn)單介紹。
2、三菱PLC采用擴(kuò)展存儲(chǔ)器通訊控制變頻器的系統(tǒng)配置
2.1系統(tǒng)硬件組成
如圖1~圖3所示。
Mitsubishi FW737B Circuit Board BN624E957G52
Mitsubishi FW73B Circuit Board BN634E002G51
Mitsubishi FW712B Circuit Board BN634E038G51
Mitsubishi TUCA-02-DWC Circuit Board BY171A401G51
Mitsubishi FW709A Circuit Board BN624A675G51
Mitsubishi WXPA-02-DWC Circuit Board BY171A361G53
Acrison MD11-2000 TBA Module
Rosemount 8712-0507-0031 PCB Alarm Control Board
Rosemount CCA 08712-0115 PCB Display Board
Kodak 100-242-215 Interface Board with Hubbell Twist Lock Receptacle, Enclosure
Kodak 100-242-215 Interface Board W/ Twist Lock Receptacle, Hoffman Enclosure
QCA QDA-2V-01 Fiber Optic Board (Metal Battery Holder)
QCA QDA-2V-01 Fiber Optic Board (Missing Bulb,Toggle Switch,Connector)
QCA QDA-2V-01 Fiber Optic Board (Plastic Battery Holder)
QCA QDA-2V-01 Fiber Optic Board Metal Battery Holder (Missing Bulb)
QCA QDA-2V-01 Fiber Optic Board (Plastic Battery Holder) (No Toggle Switch)
QCA QDA-2V-01 Fiber Optic Board (Plastic Battery Holder) (No Connector)
E. Kodak RL-190-59557 Board
Kodak 100-242-215 Interface Board Rev. 1 (Used)
MARL 048-000-22 or PCB4805/2 Fiber Optic Board with Enclosure (1 Bracket Broke)
Fanuc A16B-1010-0050-19C Mother Board
WOODWARD 5461-644
WOODWARD 5462-718
WOODWARD 5461-650
WOODWARD 5500-577
WOODWARD 5462-948
WOODWARD 5463-473
WOODWARD 5462-744
WOODWARD 5461-648
WOODWARD 5462-408
WOODWARD 5462-758B
WOODWARD 5462-916
WOODWARD 5461-655
WOODWARD 5462-757
3BHE022291R0101 PCD230A
086363-002 OSPS2
DSMB114 57360001-MG
YXU149 YT296000-RX
C1900/0363 C1900/0363/0360A
DSBC110 57310256-E
DSMB151 57360001-K
YT296000-MZ YXU149B
C1900/0263/0260A C1900/0263
DSBC111 57310256-K
YXU144 YT296000-MC
DSMB144 57360001-EL
YXO126 4890024-UN
G703-120-Q HMQ509V31
1C31219G01
5A26458G05
DSAI155
DSAI155A
DSAO110
DSAO130
DSAO120
DSAO120A
DSAX452
DSBB110
DSBB110A
DSBC110
DSBC111
DSBC172
DSBC173
DSBC173A
DSCA114
DSCS140
DSDI110
Fanuc A16B-1010-0050-16C Mother Board
Fanuc A16B-1210-0430/04B Axis Memory Board
Fanuc A16B-1210-0410/03A ACP Circuit Board
Fanuc A16B-1210-0470/03B ROM/RAM Board
Fanuc A16B-1210-0481/02A I/O Board (Used)