Setting The Communications Conditions - Omron E5EK DEVICENET User Manual

CHAPTER 6 USING CompoBus/D (DEVICENET)

6.3 Setting the Communications Conditions

J Baud rate
J Node address
6--6
Set the parameters relating to the items described in this section before
you start communications.
• The baud rate must be set to the same value over the entire network.
• Select the baud rate in the "baud rate" (option mode) parameter from
among 125/250/500 (Kbit/s). Default is "125 (Kbit/s)".
• Generally speaking, a slower baud rate enables communications over
a longer communications path. So, take factors such as the size of the
network into consideration when determining the baud rate. The fol-
lowing table shows the relationship between baud rate and network
length:
Max. Network Length
Baud Baud
Rate
Thick Cable
500kbit/s 100m max.
250Kbit/s 250m max.
125kbit/s 500m max.
• Set the node addresses so that they do not conflict with other devices
on the Network.
• Select the node address in the "node address" (option mode) parameter
within the range 0 to 63. Default is "0".
• On the E5EK-DRT, occupied channels are increased or decreased by
assigning communication data. When you are using the OMRON PLC
master, prevent occupied channels from overlapping other devices. For
details on assigning channels, see the "CompoBus/D (DeviceNet) Opera-
tion Manual (W267)."
Max. Branch Max. Branch
Line Length
Thin Cable
100m max. 100m max. 6m max. 6m max.
Max. Total Max. Total
Branch Length
39m max.
78m max.
156m max.