Rockwell Automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual - Manual (Page 90)

Publication 1734-UM002C-EN-P - July 2003
B-10 1734-ADNX Quick Start
• A unique attribute, Max(imum) Backplane MACID has been
added to 1734-ADNX. This value represents the highest node
address of a module residing on the backplane. This value must
be greater than or equal to the rightmost backplane POINT I/O
module, but must be less than that of any non-backplane Subnet
module. You select this value to allow for the future addition of
backplane modules. The attribute’s default value is 31,
representing the middle of the address range (The DSA is
already at a node number less than 31, so you will be required
to lower this number in a later step).
• The 1734-ADNX will automatically maintain the MAC IDs of the
backplane modules.
• Note that the assignment of the MAC IDs of the non-backplane
Subnet modules is manual and is not performed or retained by
the 1734-ADNX.
• The 1734-ADNX supports 125kb, 250kb, and 500kb baudrates.
For this example, you are going to set the Subnet to 500 kb.
When using Auto Start Mode, the adapter:
• Sets all POINT I/O modules on the backplane to Auto Baud
• Reads all POINT I/O module IDs on the backplane
• Sets the POINT I/O module addresses sequentially
• Set the Max Backplane MACID
• Generates a scanlist for the backplane
• Maps automatically I/O data, based on byte (I/O data is
mapped in the adapter’s memory at the next available byte),
word (I/O data is mapped at the next available word),
double-word (I/O data is mapped at the next available double
word) boundaries or the data is mapped to a fixed allocation
size. You will choose one of these four options from a drop
down menu later in this Quick Start
IMPORTANT
Your 1734-ADNX DeviceNet adapter must be free of
I/O connections when you use Auto Start Mode. If
another scanner device has established I/O
connections with the adapter (if it is mapped in
another scanner’s scanlist), the attempt to use Auto
Start Mode is rejected. Also, when the adapter is
configuring itself in Auto Start Mode, no other device
can establish I/O connections to the adapter.