1、PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 1P R O F I B U S第三部分安装与布线技术培训PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE Internati
2、onal Open Fieldbus Standard Technique, Rev. 1, Part III - Page 2传输特点(1)高速(H2), RS 485依据RS 485异步NRZ 传输波特率从9.6 kBit/s 到12 MBit/s可选双绞屏蔽电缆每段32 个站最多允许127 个站距离: 12 MBit/s = 100 m; 1.5 MBit/s = 400m; 0.34 mm每单位长度的电容 30 pF / m PROFIBUS 电缆被列在PROFIBUS 电子产品指南中PROCESS FIELD BUSPROFIBUS InternationalCopyright by
3、 PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 6波特率kBit/s 9.6 19.2 93.75 187.5 500 1500 12000线长m, A类电缆1200 1200 1200 1000 400 200 100PROFIBUS 电缆长度对RS 485长度可以用中继器来延长PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS Intern
4、ational 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 79 针D 型连接器的针脚分配为RS 485用对PROFIBUS-DP/FMS 提供的连接器类型是9 针D 型连接器插座部分被安装在设备上如果其他连接器能提供必要的命令信号的话也允许使用针脚号信号规定1 Shield屏蔽/保护地2M24 24 V 输出电压的地3 RxD/TxD-P *接收数据/传输数据阳极 (+)4 CNTR-P中继器控制信号 (方向控制)5DGND *数据传输势位对地 5V6
5、VP *终端电阻-P的供给电压, (P5V)7P24输出电压 24V8 RxD/TxD-N *接收数据传输数据阴极-9 CNTR-N中继器控制信号 方向控制* 每个设备必须支持命令信号PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 8拓朴这里提供的拓扑是总线型拓扑在总线的开头和结尾必须有终端一段可以由最多32 个
6、站*组成终端终端终端2 3 30 3162 6133 32(PROFIBUS 支持总线型树型和星型拓扑)终端中继器中继器* 注: 中继器没有站地址但它们被计算在每段的最多站数中站1PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 9安装RS 485 (1)站1站2屏蔽保护地RxD/TxD-P (3)DGND (5)
7、VP (6)RxD/TxD-N (8)(3) RxD/TxD-P(5) DGND(6) VP(8) RxD/TxD-N390 数据线数据线DGND (5)VP (6)220 390 RxD/TxD-P (3)RxD/TxD-N (8)电缆A型电缆的总线终端保护地PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 10
8、安装RS 485 (2)VPBADGND第一个站390 220 390 总线终端最后一个站总线终端VPBADGND数据线B数据线AB BAA站2站3390 220 390 PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 11RS 485 的屏蔽/ 接地详细的安装指示在PROFIBUS-DP / FMS 的安装导则
9、中说明订单号2.112数据电缆接地电缆从从主接地线数据电缆接地线接地线PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 12RS-485 传输的数据位顺序每个八位二进数字节按11 位的顺序被传输最小的有效位(LSB) 被第一个发送最大的有效位(MSB) 被最后发送每个八位二进数都补充三位即开始终止和奇偶校验位此编码
10、原理称NRZ 即Non Return to Zero空闲开始1 2 3 4 5 6 7 8 奇偶终止开始校验位顺序:1. 字节LSB MSB2. 字节LSBPROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 13120 轴ca. 2.5 Vca. 2.5 Vca. 2.5 Vca. 2.5 V0轴0 轴信号电平线A线
11、B微分电压A - B121 = 数据传输开始2 = 空闲段无数据传输总线终端终止的电平PROCESS FIELD BUSPROFIBUS InternationalCopyright by PROFIBUS International 1997 PROFIBUS - THE International Open Fieldbus Standard Technique, Rev. 1, Part III - Page 14冗余性提高了系统的可靠性若干种接口给予了冗余系统的可能光纤段给予了冗余电线的能力PROFIBUS-DP每个测量点两个设备FOcouplerFOcouplerFOcouplerFOcoupler系统冗余介质冗余
