1756-BA1/ABPLC模塊
在該通信方式下,通信端口*由用戶程序所控制,通信協(xié)議也由用戶設(shè)定。PC機(jī)與PLC之間是主從關(guān)系,PC機(jī)始終處于主導(dǎo)地位。PLC的通信編程首先是對(duì)串口初始化,對(duì)S7-200PLC的初始化是通過對(duì)特殊標(biāo)志位SMB30(端口0)、SMB130(端口1)寫入通信控制字,設(shè)置通信的波特率,奇偶校驗(yàn)位、停止位和字符長度。顯然,這些設(shè)定必須與PC的設(shè)定相一致。SMB30和SMB130的各位及含義如下:
其中,校驗(yàn)方式:00和11均為無校驗(yàn)、01為偶校驗(yàn)、10為奇校驗(yàn);字符長度:0為傳送字符有效數(shù)據(jù)是8位、1為有效數(shù)據(jù)是7位;波特率:000為38400baud、001為19200baud、010為9600baud、011為4800baud、100為2400baud、101為1200baud、110為600baud、111為300baud;通信協(xié)議:00為PPI協(xié)議從站模式、01為自由口協(xié)議、
1756-BA1/ABPLC模塊
1756
MFR. PART NUMBER DESCRIPTION
1756-A10 10 SLOT CONTROLLOGIX CHASSIS
1756-A13 13 SLOT CONTROLLOGIC CHASSIS
1756-A17 CHASSIS 17 SLOT CONTROLLOGIX
1756-A4 4 SLOT CONTROLLOGIX CHASIS
1756-A7 7 SLOT CONTROLLOGIX CHASSIS
1756-BA1 LOGIX5000 BATTERY ASSEMBLY
1756-CFM 2 CHANNEL /2 OUT CONFIGURABLE FLOWMETER
1756-CNB CONTROLNET BRIDGE MODULE
1756-CNBR CONTROLNET REDUNDANT BRIDGE MODULE
1756-CP3 LOGIX5000 RS232 PROGRAMMER CABLE
1756-DHRIO 2 CHANNEL DH+ AND/OR RIO SCANNER
1756-DNB DEVICE NET BRIDGE/SCANNER MODULE
1756-DPALEN CONTROLLOGIC SYSTEM DOCUMENTATION SET PRINTED
1756-ENET ETHERNET/IP BRIDGE MODULE
1756-GTWY CONTROLLOGIC GATEWAY CONFIGURATION SOFTWARE
1756-GTWYR SUPT REINSTATEMENT CONTRACT FOR 1756GTWY
1756-GTWYS SUPT RENEWAL CONTRACT FOR 1756GTWY
1756-HSC 2 CHANNEL /4 OUTPUT HIGH SPEED COUNTER
1756-IA16 79-132 VAC INPUT 16PTS
1756-IA16I 79-132 VAC ISOLATED INPUT 16PTS
1756-IA8D VAC DIAGNOSTIC INPUT 8PTS
1756-IB16 VDC INPUT 16PTS
1756-IB16D VDC DIAGNOSTIC INPUT
1756-IB16I VDC ISLOTED INPUT 16PTS