描述
在该通信方式下，通信端口完全由用户程序所控制，通信协议也由用户设定。PC机与PLC之间是主从关系，PC机始终处于主导地位。PLC的通信编程首先是对串口初始化，对S7-200PLC的初始化是通过对特殊标志位SMB30（端口0）、SMB130（端口1）写入通信控制字，设置通信的波特率，奇偶校验位、停止位和字符长度。显然，这些设定必须与PC的设定相一致
Siemens Sinumerik System 8M Rack 6FC3381-0EA-Z
SEW Eurodrive Movitrac 1015-403-4-00 2,8kVA / 1,5kW
Heidenhain Maßstab LS 481 ML 920mm NEU 37284925 AS0006
Siemens Simoreg Board C98043-A1045-L1-03
Siemens Simoreg Board C98043-A1045-L1-D2
Siemens Sinumerik Kuka ACR-GRT-PHG 6FR2490-0AH12
Bosch Servo Controller Servodyn TYP: SM 10/20-TC1 10A
Siemens Simodrive 611 6SN1118-0DG21-0AA0 V.E
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Danfoss Frequenzumrichter 12,6kVA VLT 3011 175H7273 RFI
Weber WSG100 Operator Panel + Controller WSG 100
Siemens Simoreg Komfortregler C98043-A1098-L11
Siemens Sinumerik DUALPORT PCB 6FX1124-0BA03 A0103
