Allen-Bradley devicenet modules in logix5000 control systems Manual Do Utilizador

Publication DNET-UM004A-EN-P - March 2004

Automatically Configure a DeviceNet Network        4-13

1. The bytes/node value defines how 

much memory for each address.

AutoScan lets you specify how much input and output memory to give to each address on 
your network.

2. The scanner sets-up communication 

with any device that fits within the 
allocated memory size.

The scanner automatically sets up communication with those devices that fit within the 
memory allocated for each address.

• For example, if you allocate 2 DINTs (8 bytes) per address, the scanner sets up 

communication with any device that sends or receives 1 - 8 bytes of data.

• The scanner adds as many device as it can until it runs out of memory.
• If you give too much memory to each address, you may not have enough memory for 

all your devices.

3. The scanner skips devices that are 

too large.

If a device needs more memory than is allocated, the scanner skips it and does not set up 
communication with it.

For example, if you specify 2 DINTs (8 bytes) per address but a device sends 9 bytes, the 
scanner does not add the device to the scan list.

4. Manually editing the scan list turns 

off AutoScan.

If you use RSNetWorx software to edit the configuration of the scanner, the scanner turns 
off AutoScan. Do not turn it back on or you will clear the configuration that you just 
entered.

For example, if you use RSNetWorx software to manually add a device to the scan list, the 
scanner turns off AutoScan. If turn on AutoScan again, the scanner clears it current 
configuration and starts over.

DINT

Input Memory

0

device at address 0

1

2

device at address 1

3

4

device at address 2

5

The actual data for the device fills the portion

that it needs and the rest remains unused.

For example, if you specify 2 DINTs (8 bytes)

per address, the scanner sets aside 2 DINTs

for each address.