3-4
Section
DeviceNet I/O Link Unit
222
When the 32 bits of input data must be read together, modify the ladder program
in the CPU Unit receiving the data. For example, read the input data twice in suc-
cession and accept the data only when the two values match.
Unused bits in the DeviceNet I/O Link Unit’s output words can be used as work
bits if they are not used for output from the slave.
Unused bits in input word cannot be used as work bits.
Determining the Node Number and Making DIP Switch Settings
Use these switches to set the node address of the Unit.
Setting method: Two-digit decimal
Setting range:
0 to 63 (Do not set 64 to 99.)
Note
1. Set the rotary switches before turning ON the power supply. The switch set-
tings are read only at startup.
2. Any node address from 0 through 63 can be set as long as it hasn’t been set
on another slave node.
3. If the node address is the same as one set on another node, a node address
duplication error will occur and it won’t be possible to start up network com-
munications. Refer to the
DeviceNet Slaves
Operation Manual
(W347) for
details.
The DIP switch on the front of the DeviceNet I/O Link Unit is used to set the baud
rate and whether to hold or clear the remote outputs when a communications
error occurs in the slave.
Hold/clear input for communications error (when used as a slave)
Not used.
Baud rate
The settings of the DIP switch pins are shown in the following table. All pins are
set to OFF at the factory.
Pin
Function
Setting
1
Baud rate
See the next table.
2
3
Not used
OFF
4
Hold/clear remote outputs for
communications error
OFF:
Clear remote outputs
ON:
Hold remote outputs
Baud Rate
Pins 1 and 2 are used to set the baud rate as shown in the following table.
Pin 1
Pin 2
Baud rate
Max. transmission path length
(reference)
OFF
OFF
125 kbps
500 m
ON
OFF
250 kbps
250 m
OFF
ON
500 kbps
100 m
ON
ON
Not allowed.
---
Note
1. Always turn OFF the PC before changing the DIP switch settings.
2. Set the same baud rate on all of the nodes (Master and Slaves) in the Net-
work. Any slaves with baud rates different from the master’s rate won’t be
able to participate in communications and may cause a communications er-
ror between nodes that have been set properly.
Node Address Switches
DIP Switch
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