1-1
Section
Features of the DeviceNet Interface Unit
2
1-1
Features of the DeviceNet Interface Unit
The DeviceNet Interface Unit is an interface that connects PTs (Programmable
Terminals) to a DeviceNet network. The DeviceNet Interface Unit can connect
NT31, NT31C, NT631, and NT631C PTs.
DeviceNet is a industry-standard network, so the DeviceNet Interface Unit is
compatible with devices from different vendors. An OMRON PT can be con-
trolled from another company’s Master when it is connected to the DeviceNet
network.
The DeviceNet Interface Unit allows a PT to be connected easily to an existing
DeviceNet network. Separate PT wiring is not required and wiring work is re-
duced. The DeviceNet network has a maximum communications distance of
500 m, so a PT in a remote location can be controlled from the Master.
The DeviceNet Interface Unit supports both remote I/O communications and ex-
plicit message communications.
•
Remote I/O Communications
Remote I/O communications can exchange data (32 input words and 32 out-
put words max.) with the PT at high speed and without programming, just like
regular I/O.
•
Explicit Message Communications
More complicated control operations can be performed by sending explicit
messages from the Master when required.
A PT connected through the DeviceNet Interface Unit can execute simulated di-
rect access with Memory Link. The PT can be controlled from the DeviceNet
Master that acts as the host by reading and writing PT memory within the PT.
Master
Data transfer and control
through remote I/O com-
munications and explicit
message communica-
tions
Communications
power supply
T-branch Tap
Slave
(C200H I/O Link Unit)
Slave
Slave
T-branch Tap
with termination
T-branch Tap
with termination
Slave
PT connected to Device-
Net Interface Unit
Network length 500 m max.
Compatible with Other
Companies’ Masters
Easily Connect to an
Existing DeviceNet
Network
Supports Remote I/O and
Explicit Message
Communications
Memory Link Control
