Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 251)

Publication AG-UM008C-EN-P - February 2005
Configuring Logix Controllers 7-25
Accessing DF1 Diagnostic
Counters To access the DF1 diagnostic counter array, it is necessary to include a
specific rung of ladder logic in your program. The purpose of the
ladder logic is to write the Diagnostic Counter values into a named
tag, where the values can then be easily viewed.
The following instructions explain how to create the DF1 diagnostic
counter storage tag, view local and remote DF1 diagnostic counters
and reset local DF1 diagnostic counters.
NAKs received word 6 The number of NAKs received by the controller
ENQs received word 7 The number of ENQs received by the controller
bad packets NAKed word 8 The number of incorrect data packets received by the controller for
which a NAK was returned
no memory sent NAK word 9 The number of times the controller could not receive a message because
it did not have available memory
duplicate packets received word 10 The number of times the controller received a message packet identical
to the previous message packet
bad characters received word 11 The number of bad characters received
DCD recoveries count word 12 The number of times the controller detects the DCD handshaking line
has gone low to high
lost modem count word 13 The number of times the lost modem minor fault has come on
unused word 14-17
ENQs sent word 18 The number of ENQs sent by the controller
Table 7.9 DF1 Full-Duplex (Point-to-Point) Diagnostic Counters
Status Field Diagnostic Tag Array
Location Definition
1. To bring up the Controller Tags
interface, click once on the controller
Tags icon.