Schneider Electric 890USE17700 - Manual (Page 152)

Advanced Configuration Features
152 890USE17700 April 2004
Reserving Data
Sizes To transfer data to the PLC from a Modbus HMI panel attached to the CFG port, you
must reserve space for that data. To reserve data sizes:
CANopen Device
Node IDs From the Parameters tab, you can set the maximum node ID of the last module on
the island bus. The last module may be a standard CANopen device. Standard
CANopen devices follow the last segment of STB I/O modules. CANopen modules
are addressed by counting backwards from the value that you specify here. The
ideal node ID sequence is sequential.
For example, if you have an island with five STB I/O modules and three CANopen
devices, a maximum node ID of at least 8 (5 + 3) is required. This will result in node
IDs of 1 through 5 for STB I/O modules and 6 through 8 for standard CANopen
devices. Using the default ID of 32 (the maximum number of modules the island can
support) will result in node IDs of 1 through 5 for STB I/O modules and 30 through
32 for standard CANopen devices. Unless required, high addresses are not
desirable if any of your standard CANopen devices has a limited address range.
Assigning the
Max. Node ID
(CANopen
Devices) To assign the highest node ID used by a CANopen device on the island bus:
Step Action Result
1 In the module editor window, select the
Parameters tab.
2 In the Parameter name column, expand the
Additional Info Store List by clicking on the plus
(+) sign.
The configurable NIM parameters
are displayed.
3 Double-click in the Value column next to the
Reserved Size (Words) of HMI to PLC table.
The value is highlighted.
4 Type a value for the data size to be reserved
for data sent from the HMI panel to the PLC.
The value plus the data size of your
island cannot exceed the maximum
value. If you accept the default value
(0), no space will be reserved in the
HMI table in the process image.
5 Repeat steps 2-4 to select a value for the
Reserved Size (Words) of PLC to HMI table
row.
6 Click on the OK button to save your work.
7 Click on the Apply button to configure the NIM
with these values.
Step Action Comment
1 In the module editor window, select the
Parameters tab.
Configurable parameters are located
under this tab.
2 In the box next to Max. node ID on the
CANopen extension, enter a node ID.
This node ID represents the last
CANopen module on the island bus.