Detailed Devicenet Specifications - Omron K3HB - MANUAL 2 Manual

Detailed DeviceNet Specifications

8-1 Detailed DeviceNet Specifications
Data Size and Connection Types
If the connection type can be set when another company's configurator is being used, select a connection sup-
ported by the DeviceNet Communications Unit.
The following table shows the connection types and data sizes for OMRON DeviceNet Communications Units.
Model
K3HB-DRT
Note The size of the IN/OUT Areas depends on the setting.
DeviceNet I/O communications support the following types of connections.
Connection type
Poll Used to exchange data between the master and
individual slaves by sending and receiving com-
mands and responses. (Output data is allocated
for commands and input data is allocated for
responses).
Bit strobe Used to broadcast commands from the master
and receive input responses from multiple
slaves.
Change of state Normally, input and output data are sent by mas-
(COS)
ter and slaves at regular cycles, but with a COS
connection, data is sent to the master or slave
when the master or slave data changes.
Cyclic Masters and slaves send output or input data at
regular cycles.
10-2
Supported connections
Poll Bit strobe
Yes Yes
Details
Change of Cyclic
state (COS)
Yes Yes
---
By using one command only, the communica-
tions cycle time is short, but bit strobe connec-
tions can be used only with slaves with 8 or less
input points.
By setting a long cycle interval, the Network will
not be loaded with communications for minor
data changes, thereby improving the overall effi-
ciency of the Network.
Section 8-1
Data size (bytes)
IN OUT
1 to 120 1 to 58
(See note.) (See note.)
Remarks