Rockwell Automation 842D Absolute Encoder, DeviceNet Multi-Turn - Manual (Page 3)

3
Bus Termination
The recommended method for connecting DeviceNet products
is to run a “trunk line” with 120 ohm resistors connected at
each end. DeviceNet products are then connected as “drops”
along the length of the trunk line. In this configuration, the
internal termination resistor of the 842D should not be used
and the bus termination DIP switches should be off.
When 842D encoders are connected in a “daisy chain”
configuration, the internal termination resistor may be used on
the end positions only. In this configuration, the end 842D(s)
should have their bus termination DIP switches turned on.
Further details on termination resistors can be found in
publication DN–6.7.2 DeviceNet Cable System Planning and
Installation Manual.
ATTENTION: If you do not use
terminating resistors as described here
and in publication DN–6.7.2, the
DeviceNet cable system will not
operate properly.
1 2
ON
Bus termination
1 and 2 OFF: not active
1 and 2 ON: active
Note: Remote setting of the DIP switches via a Node
Commissioning Tool is not supported at this time.