Omron E5ZN-DRT, Руководство по эксплуатации

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Appendix A
Connecting to a Master from Another
Company
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.
Note The size of the IN/OUT Areas depends on the setting.
DeviceNet I/O communications support the following types of connections.
Model Supported connections Data size (bytes)
Poll Bit strobe Change of
state (COS)
Cyclic IN OUT
DeviceNet
Communica-
tions Unit E5ZN-DRT Yes No Yes Yes 1 to 200
(See note.)
1 to 200
(See note.)
Connection type Details Remarks
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. 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.
Change of state
(COS) Normally, input and output data are sent by mas-
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. 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.
Cyclic Masters and slaves send output or input data at
regular cycles.