Rockwell Automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter - Manual (Page 57)

Publication 1769-UM001B-EN-P - October 2002
Configuring Your Compact I/O Series A DeviceNet Adapter 3-7
Using Banks of I/O Configuration Rules for the Series A Adapter
• The Series A adapter must be the first and left-most module in
the system (the first module of Bank 1).
• The Series a adapter can communicate with up to 30 modules in
a system.
• Each bank of I/O must have its own power supply.
• A bank of I/O can have a maximum of 16 modules with a
maximum of eight on either side of the power supply,
depending upon module loading on the supply.
• A 1769 I/O power supply has limits in the amount of +5V dc and
+24V dc current it can supply to the modules in its I/O bank.
These limits depend on the catalog number (e.g. 1769-PA2) of
the supply. A bank of modules should not exceed the current
limits of the I/O bank power supply. Refer to the Compact 1769
Expansion I/O Power Supplies Installation Instructions,
publication 1769-5.14.
• The maximum amount of current each bank supports in one
direction (either side of the power supply) is: 2A @ 5V dc, 1A @
24V dc.
• If another bank of I/O is required, use a bus communication
expansion cable (e.g. 1769-CRL) to link them together. You can
have a maximum of three banks of I/O connected with up to
two communication expansion cables.
• Each module type has its own distance rating (the number of
modules from the power supply). Each module must be within
this rating for its type.
• The Series A adapter has a distance rating of four, therefore the
adapter must be within four modules of the power supply.
• The Series A adapter supports a total of:
– 180 words of input data from the I/O modules.
– 180 words of output data for the I/O modules.
– 724 words of configuration data for the I/O modules.
• An end cap/terminator must be on the last I/O bank.