Rockwell Automation 1747-SDN SLC 500 DeviceNet Scanner Module User Manual - Manual (Page 137)

Publication 1747-UM655B-EN-P - June 2007
Data Organization 137
Scan Counter
Word 211 is used for the module scan counter. The module
increments this counter whenever a scan of the DeviceNet devices is
completed. The counter rolls over when it reaches a maximum value
of 65,535. It is located at M1:S.211.
Device Idle Table
Words 212…215 in the M1 file are used for the device idle table. This
table indicates that there are devices on the network in Idle mode.
The module tracks devices in Idle mode by assigning one of the 64
bits in the table to each device on the network. The bits are assigned
in consecutive order to consecutive device addresses starting at mode
0 at M1.S.212/0.
Device Failure Table
Words 216…219 in the M1 file are used for the device failure table.
This table indicates communication failures of devices on the network.
The module tracks device failures by assigning one of the 64 bits in
the table to each device on the network. The bits are assigned in
consecutive order to consecutive device addresses starting at mode 0
at M1.S.216/0.
Auto Verify Failure Table
Words 220…223 in the M1 file are used for the auto verify failure
table. The auto verify failure table is used to verify that data size
received from the device matches the setting in the scanner’s scanlist
entry for that node. This check occurs at connection establishment
time. The module tracks auto verify failures by assigning one of the 64
bits in the table to each device on the network. The bits are assigned
in consecutive order to consecutive device addresses starting with
node 0 at M1:S.220/0. If the bit is set, the corresponding node has
failed to verify.