Connecting To A Master From Another Company - Omron E5ZN-DRT Operation Manual

Connecting to a Master from Another
This appendix explains how to operate the DeviceNet Communications Unit when it is connected to a master
manufactured by another company. The DeviceNet Communications Unit supports either simple I/O allocation
using the rear panel switch, or I/O allocations using the OMRON Configurator. The DeviceNet Communications
Unit is not provided with an EDS file, so simple I/O allocation must be used if another company's configurator is
used.
Data Size and Connection Types
The DeviceNet Communications Unit supports both simple I/O allocation and I/O allocations set from the Con-
figurator when the Unit is connected to another company's master, but the data size of the IN and OUT Areas
of the DeviceNet Communications Unit must be set. The size of the DeviceNet Communications Unit's data
areas will depend on the setting method used. For details, refer to SECTION 4 Remote I/O Communications.
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
DeviceNet E5ZN-DRT
Communica-
tions Unit
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.
Appendix A
Company
Supported connections
Poll Bit strobe
Yes No
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.
Data size (bytes)
IN OUT
1 to 200 1 to 200
(See note.) (See note.)
Remarks
129