1756-IF6I/ABPLC模塊
PLC以的可靠性和方便的可編程性廣泛應(yīng)用于工業(yè)控制領(lǐng)域。實現(xiàn)PC機與PLC通信的目的是為了向用戶提供諸如工藝流程圖顯示、動態(tài)數(shù)據(jù)畫面顯示、報表顯示、窗口技術(shù)等多種功能,為PLC提供良好的人機界面。本文詳細介紹了FX系列PLC的通信協(xié)議,并在Windows環(huán)境下,使用VB6.0開發(fā)通信程序,實現(xiàn)了PC機與FX系列PLC之間的串行通信。
2 PC機與PLC實現(xiàn)通信的條件
帶異步通信適配器的PC機與PLC只有滿足如下條件,才能互聯(lián)通信:
(1)帶有異步通信接口的PLC才能與帶異步通信適配器的PC機互聯(lián)。還要求雙方采用的總線標準一致,否則要通過“總線標準變換單元”變換之后才能互聯(lián)。
(2)雙方的初始化,使波特率、數(shù)據(jù)位數(shù)、停止位數(shù)、奇偶校驗都相同。
(3)要對PLC的通信協(xié)議分析清楚,嚴格地按照協(xié)議的規(guī)定及幀格式編寫PC機的通信程序。PLC中配有通信機制,一般不需用戶編程。
1756-IF6I/ABPLC模塊
1756-IB32 VDC INPUT 32PTS
1756-IC16 VDC INPUT 16PTS
1756-IF16 ANALOG INPUT-CURRENT/VOLTAGE 16PTS
1756-IF6I ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 6PTS
1756-IF8 ANALOG INPUT-CURRENT/VOLTAGE 8PTS
1756-IH16I VDC ISOLOTED INPUT 16PTS
1756-IM16I VAC ISOLATED INPUT 16PTS
1756-IN16 VAC INPUT 16 PTS
1756-IR6I ISOLATED RTD INPUT 6PTS
1756-IT6I ISOLATED THERMOCOUPLE/MV INPUT 6PTS
1756-IV16 VDC SOURCING INPUT 16PTS
1756-L1 LOGIX5550 PROCESSOR, 64KBYTE USER MEMORY
1756-L1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/160KBYTE BASE MEMORY
1756-L1M1 LOGIX5550 PROCESSOR, 512KBYTE USER MEMORY
1756-L1M1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/512KBYTE BASE MEMORY
1756-L1M2 LOGIX5550 PROCESSOR W/ 1M BYTE EXPANSION MEMORY
1756-L1M2K CONFORMALLY COATED LOGIX5550 PROCESSPR W/1MBYTE EXPANSION MEMORY
1756-L1M3 LOGIX5550 PROCESSOR WITH 2MBYTE EXPANSION MEMORY
1756-L1M3K CONFORMALLY COATED LOGIX5550 PROCESSPR W/2MBYTE EXPANSION MEMORY
1756-M02AE 2-AXIS MOTION MODULE
1756-M08SE 1756 8 AXIS SERCOS SERVO MODULE
1756-M1 LOGIX5550 512KBYTE EXPANSION MEMORY
1756-M1K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M2 LOGIX5550 1MBYTE EXPANSION MEMORY
1756-M2K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M3 LOGIX5550 2MBYTE EXPANSION MEMORY
1756-M3K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-MVI CLX MULTI VEND INTF
1756-MVID MULTI-VENDR INTF DEV KIT
1756-N2 EMPTY SLOT FILLER CARD
1756-OA16 74-265 VAC OUTPUT 16PTS
1756-OA16I 74-265 VAC ISOLATED OUTPUT 16PTS
1756-OA8 74-265 VAC 2 AMP OUTPUT 8PTS
1756-OA8D 74-132 VAC DIAGNOSTIC OUTPUT 8PTS