59
Starting Communications
Section 4-4
For details on scan lists and remote I/O communications, refer to the
DeviceNet master operation manual.
Note
When a 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 operations, always enable the scan lists.
Precautions
User I/O Allocations
The user can allocate any words for Slave I/O for the DeviceNet I/O Areas (IN
Area, OUT 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 registered, and remote 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 (IN Area, OUT 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 Master Unit's software switches. The scan list is enabled
as soon as it is registered, and remote I/O communications start according to
the scan list. When scan list is enabled, the mode is called the scan list-
enabled mode.
The registered scan lists can be cleared using the software switches. When
scan lists are cleared (disabled), the mode is called the scan list-disabled
mode.
Creating and
Registering Fixed
Allocation Scan Lists
The method of creating and registering scan lists for fixed allocation using
Programming Console and a CS/CJ-series Master Unit is explained here. For
details on operating Programming Devices, refer to the operation manual for
the Programming Device being used with the PLC. For details on creating
scan lists, refer to the DeviceNet master operation manual.
Creating and Registering
Scan Lists
Use the following procedure to create, register, and enable the scan lists.
In the following example, n = 1500 + (25
×
unit number).
Clearing and Creating Scan Lists
1,2,3...
1.
Switch the PLC’s operating mode to PROGRAM mode.
2.
Enable the Master Unit functions. Set the Master Unit function enable
switch (bit 06 of word n) from OFF to ON.
3.
Clear the scan lists. Set the scan list clear switch (bit 01 of word n) from
OFF to ON.
4.
Select the fixed allocation areas 1 to 3. Set the Master Unit's setting switch
for fixed allocation areas 1 to 3 (bit 00 of word n) from OFF to ON.
5.
Enable the scan lists. Set the scan list enable switch (bit 00 of word n) from
OFF to ON.
6.
Switch the operating mode switch to RUN or MONITOR mode.
Checking the Normal Slave Table
Monitor the normal Slave table and check that the corresponding bits are ON.
In the normal Slave table, the corresponding bits will turn ON for the nodes
that are communicating normally.
Summary of Contents for SMARTSLICE - 04-2008
Page 1: ...DeviceNet Communications Unit Cat No W454 E1 03 SmartSlice GRT1 DRT OPERATION MANUAL ...
Page 2: ...SmartSlice GRT1 DRT DeviceNet Communications Unit Operation Manual Revised April 2008 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 13: ...xiv ...
Page 27: ...8 Basic Operating Procedure Section 1 5 ...
Page 57: ...38 Unit Functions Section 2 3 ...
Page 101: ...82 DeviceNet Explicit Messages Appendix A ...
Page 113: ...94 Standard Models Appendix C ...
Page 115: ...96 Power Consumption Tables Appendix D ...
Page 117: ...98 I O Current Consumption Appendix E ...
Page 119: ...100 Glossary ...
