Siemens SIMATIC NET PROFIBUS User Manual

Page 154

Passive Components for RS-485 Networks

4-56

PROFIBUS Networks SIMATIC NET

6GK1970-5CA20-0AA1 Release 2 05/2000

Note

Please make sure that the bus terminal is accessible for maintenance and
installation work even during operation.

To connect the LAN cable, follow the steps below (see Figure 4-32):

1. Open the LAN cable at the point at which the bus terminal will be inserted.

2. Strip approximately 33 mm of the outer sheath. Make sure when removing the

sheath that the braid shield is not damaged.

3. Remove a length of approximately 12 mm of the braid shield and foil shield (the

foil shield can be left somewhat longer).

ВВВ

ВВВВ

10 mm

11 mm

12 mm

Fold braid shield back over outer

sheath

Foil shield

Figure 4-32

Preparing the LAN Cable for Connection to the Bus Terminal

4. Fold back the braid shield over the cable sheath.

5. Remove approximately the last 10 mm of insulation from the cores.

6. Fit the LAN cable to the terminal so that the braid shield is lying bare under the

cable clamp.

7. Screw the ends of the cores to the corresponding terminals (if the cores are

stranded, for example, the trailing cable, wire-end ferrules with 0.25 mm

complying with DIN 46228 must be used).

8. If the bus terminal is at the start or end of a segment, the integrated terminating

resistor must be turned on (switch set to “Terminator on”).