Watlow Series D8 - Manual (Page 60)

Chapter 2: Installation Series D8 User’s Guide
42 Watlow Anafaze Doc. 0600-3120-2000
Network Length
The network speed is limited by the end-to-end network dis-
tance. The longer the network, the slower the baud rate setting
must be. See Table 2.9
Table 2.9 Maximum Network Speed
Baud Rate (Data Rate)
DeviceNet communications can use three different baud rates
(data rates) 125k, 250k, and 500k baud. When the switch is set
to the PGM position, the unit's baud rate is determined by a
software setting. If the switch is set to PGM you must set the
data rate using the controller’s front panel or network-config-
uration software. As long as the switch is set to PGM, the con-
troller will always come back up on the network with the last
software-configured baud rate stored in the controller's mem-
ory.
As an example, assume the controller's baud rate switch is set
to PGM, and it is programmed at 500k baud. Assume too, that
the DeviceNet network experiences a power loss. When pow-
er is restored, the controller will come back up with a baud
rate of 500k baud. If on the other hand, the baud rate switch
was changed to 250k baud before the network power had been
restored, the controller will attempt to come back on the net-
work at 250k baud.
NOTE! When changing the baud rate via the soft-
ware or by manually changing the switch po-
sition, you will need to cycle power on the
network for the change to take effect.
Node Address (MAC ID)
Valid node addresses on a DeviceNet network range from 0 to
63 decimal. When the switch is set to the PGM position, the
unit's node address is determined by a software setting. If the
switch is set to “PGM” you must set the node address using
the controller’s front panel or network-configuration soft-
ware. As long as the switch setting remains set for software
Distance Baud Rate
100 m (328 ft) 500 Kbps
250 m (820 ft) 250 Kbps
500 m (1,640 ft) 125 Kbps