Specifications

Advanced Configuration Features
152
890USE17700 September 2003
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.
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.