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1-3
Features
Section 1-1
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ver
vie
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• User-set Data Allocations with a Configurator
The specific data required for communications with the master can be
allocated by using I/O allocations from the DeviceNet Configurator.
Explicit Message
Communications • By sending commands from a PLC, various operations can be performed,
including reading/writing specific monitor values and parameters, such as
reading process values or writing set points, and performing operations
using operation commands. CompoWay/F communications commands
can also be executed using explicit message communications.
Automatically Detects
Baud Rate • Previously, the baud rate had to be set for each slave, but the E5AR/ER-
DRT Digital Controllers automatically detect and match the baud rate of
the master, so this setting is not required. (If the master’s baud rate is
changed, turn OFF the communications power supply to the Digital Con-
troller and then turn it ON again.)
1-1-4 Default Communications Settings
The default settings required for communications when E5AR/ER-DRT are
used as DeviceNet slaves are listed in the following diagram.
Refer to the DeviceNet Operation Manual (Cat. No. W267) for information
such as the order for turning ON power to the master and slaves and master I/
O tables.
1-1-5 Data Allocation
E5AR/ER-DRT communications data must be allocated for the IN and OUT
Areas for remote I/O communications. Up to 100 words each can be allocated
for the IN and OUT Areas. The data for each word is allocated using the
parameters communications write data allocations 1 to 100 and communica-
tions read data allocations 1 to 100.
Unused words can be specified to reserve space according to data types or to
otherwise reduce the number of words.
Refer to 4-2 I/O Allocation on page 4-2 for details on allocation methods.
1-1-6 Remote I/O Communications
Read/write table data is automatically read and written when communications
start. The Communications Write setting must be set to ON to write data from
the master to the E5AR/ER-DRT. Data will not be written to the Digital Con-
troller if the Communications Write setting is OFF. The following diagram
shows communications with the default data allocation parameters.
Communications Settings:
Node address
Operation for communications
errors
Communications Data Allocations:
Monitor value settings
Operation commands
Status
Be sure that the same node address is not
used for another Unit on the same network.