Rockwell Automation 1769-SDN Compact I/O DeviceNet Scanner Module User Manual - Manual (Page 88)

88 Publication 1769-UM009E-EN-P - August 2009
Chapter 6 DeviceNet I/O Image
MicroLogix 1500 Status
Structure The first area of the MicroLogix 1500 controller input image is the Status
Structure. The status words are described in more detail in the following
sections.
Scan Counter
This 32-bit unsigned value is incremented each time the DeviceNet network is
scanned. The value will automatically roll over to zero and continue counting.
Description Words Data Type
Scan counter 0 and 1 2 words
Device failure array 2…5 64-bit array
Autoverify failure array 6…9 64-bit array
Slave device idle array 10…13 64-bit array
Active node array 14…17 64-bit array
Reserved
(1)
(1) Do not manipulate reserved bits. Doing so may interfere with future compatibility.
18…19 4-byte array
Scanner module status 20 and 21 4-byte array
Reserved array
(1) 22…31 20-byte array
Device status array 32…63 64-byte array
Module status register 64 and 65 2 words