Bray 70 Series SERVO PRO DeviceNET - Manual (Page 10)

S70 DeviceNet Servo Installation & Maintenance Manual
2000 BRAY CONTROLS Page 9 of 24
The resistor requirements are:
121 ohm
1 % Metal Film
1/4 Watt
Terminating resistors should never be included in nodes. Inclusion of this capability could easily
lead to a network with improper termination (too high or too low an impedance) potentially
causing failure. For example, removal of a node that includes a terminating resistor could result
in network failure.
Devices along the truck-line are attached with Taps (Figure 5) so that any device can be
removed or replaced without disconnecting the trunk-line. This feature provides the ability to
interchange devices on a network while it is operational reducing network downtime.
Both the trunk-line and drop cables consist of 4 wires and a shield. The wire colors and
connector wiring are described in Section (2.2.3) for the DeviceNet Mini-style connector used
in the S70 Actuator, and the DeviceNet Open Style connector used on the S70 Servo.
The trunk-line and drop cable are limited in length and are also effected by the speed of the
network. Refer to Table 3 for details on cable lengths.
Figure 4: Example DeviceNet communication link