Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 29)

Publication 2711P-UM002B-EN-P - March 2007
Configuring KEPServer Drivers for Modbus 29
Reasons to Change the Default Block Sizes include:
• The device may not support block read/write operations of
the default size. Smaller Modicon PLCs and non-Modicon
devices may not support the maximum data transfer lengths
supported by the Modbus Ethernet network.
• The device may contain non-contiguous addresses. If this is
the case and the driver attempts to read a block of data that
encompasses undefined memory, the device will probably
reject the request.
Step 9 - Set Location of the Variable Import File
The New Device - Variable Import Settings dialog sets the location of
the Concept or ProWORX variable import file the driver will use when
the automatic tag database generation feature is enabled for this
device. Refer to the KEPServer Enterprise online help for details on
how to use this feature.