YASKAWA SI-P3 Installation Manual page 32

5 Installation Procedure
PROFIBUS-DP Termination
n
The option does not have a built-in termination resistor. The termination resistance must be
set on the final drive in the network using a switch on the 9-pin D-sub connector. Make sure
that only the connector for the final drive in the network has a termination resistor;
communication problems may arise if any other network drive has a termination resistor.
Use only the input side cable entry as shown in Figure 19 when connecting both ends of the
network. Most 9-pin D-sub connectors have a function for disconnecting the output side of
the cable. Communication will not be possible between devices if the connector is reversed.
Most connectors have arrows indicating the input and output sides.
Figure 19
9-pin D-sub Connector
Bus termination
Switch
ON
O
O O
OFF
Incoming Cable
Outgoing Cable
Figure 19 PROFIBUS Cable Connection with Termination Resistors
Bus termination ON = incoming and outgoing cables not connected.
Bus termination OFF = incoming and outgoing cables connected.
32 YASKAWA ELECTRIC TOBP C730600 82B YASKAWA AC Drive Option SI-P3 Installation Manual