ABB AC900F学习笔记53-Freelance_Mounting_and_Installation_AC_900F_Controller-13

3.2.4 PROFIBUS connector and cables

PROFIBUS插头和线缆

Fieldbus interface 现场总线接口

The PROFIBUS DP connector features the following pin assignment:

PROFIBUS DP插头针脚定义如下：

 

 

Bus link总线连接

Type 类型	Twisted pair wire (shielded)  屏蔽双绞线
Impedance level 阻抗大小	135…165 Ω
Cable capacity 电缆容量	< 30 pF/m
Cable core diameter 单芯电缆直径	≥ 0.64 mm
Cable core cross-section 单芯截面积	≥ 0.34 mm2
Resistance per cable core 单芯电阻	< 55 Ω/km
Loop resistance (resistance of two cable cores) 回路电阻（两芯电阻）	< 110 Ω/km

Cable length

电缆长度

 

The maximum cable length of a PROFIBUS subnet within one segment depends on the baud rate (transmission rate).

Transmission rate in kBit/s 传输速率	Maximum cable length 最大线缆长度
9.6;19.2; 45.45; 93.75	1200m
187.5	1000
500	400 m
1500	200 m
3000, 6000, 12000	100 m

Bus termination

总线终端

        Both bus segment ends must be provided with a termination resistor. These resistors are usually integrated into the PROFIBUS connector. As the bus termination is active, it must be ensured that both terminations are supplied with +5 V by a module or an external power supply. 

       所有的总线末端都需要由终端电阻。这些电阻器通常集成到 PROFIBUS 连接器中。由于总线总是活跃的，因此必须确保两个端接端都由模块或外部电源提供 +5 V。