21
Starting Communications
Section 2-4
2.
Turn ON the power to each Slave.
3.
Turn ON the power to the Master Unit.
The power supplies listed above can all be turned ON simultaneously. The
external I/O power supply can be turned ON at any time.
2-4-3
Creating and Registering Scan Lists
Scan lists are lists that register the information that is transferred between
Master Units and Slaves. The Master Unit compares the scan list with the sta-
tus of the Slave currently being communicated with, so communications with
the Slave are always being checked.
For details on scan lists and remote I/O communications, refer to the opera-
tion manual for the Master Unit.
Note
When the scan list is disabled, communications are possible with all Slaves
on the DeviceNet Network with fixed allocations. Without scan lists, however,
the Master Unit cannot check if there is an error in a Slave. For normal opera-
tions, always enable the scan lists.
Precautions
• User I/O Allocations
The user can allocated desired words for Slave I/O in the DeviceNet I/O
Areas (Input Area, Output Area) in the Master Unit. When user allocations
are used, scan lists must be created with a DeviceNet Configurator and
registered in the Master Unit. The scan list is enabled as soon as it is reg-
istered, and I/O communications start according to the scan list. For
details, refer to the
DeviceNet Operation Manual (W267)
and the
DeviceNet Configurator Operation Manual (W328)
.
• Fixed I/O Allocations
Slave I/O is allocated in the DeviceNet I/O area (Input Area, Output Area)
in the Master Unit in the same order as the Slave node addresses. When
fixed allocations are used, the scan lists are automatically created and
registered using the software switches. The scan list is enabled as soon
as it is registered, and I/O communications start according to the scan list.
The registered scan lists can be cleared using the software switches.
Note
If scan lists are not enabled, operation will be performed on the DeviceNet
network according to fixed allocations, but the Master will not be able to rec-
ognize errors. Always enable the scan lists during normal operation.
Creating and Registering
Fixed Allocation Scan
Lists
The method of creating and registering scan lists for fixed allocation using
Programming Console is explained here. For details on operating the Periph-
eral Device, refer to the Operation Manual for the Peripheral Device being
used with the PLC. For details on creating scan lists, refer to the operation
manual for the Master Unit. For fixed allocations, the PLC’s Peripheral Device
is used to operate the Master Unit’s software switches, monitor the Status
Areas (Master Status Area 1 and Registered Slave Data Area), and create
and register scan lists.
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