Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 240)

Publication AG-UM008C-EN-P - February 2005
7-14 Configuring Logix Controllers
Table 7.4 DF1 Half-Duplex Master Diagnostic Counters
Status Field Diagnostic Tag Array
Location Definition
signature (68
10
) word 0 DF1 Half-Duplex Master is the configured protocol
DTR (Data Terminal Ready) word 1;bit 4 The status of the DTR handshaking line (asserted by the controller)
DCD (Data Carrier Detect) word 1;bit 3 The status of the DCD handshaking line (received by the controller)
DSR (Data Set Ready) word 1;bit 2 The status of the DSR handshaking line (received by the controller)
RTS (Request to Send) word 1;bit 1 The status of the RTS handshaking line (asserted by the controller)
CTS (Clear to Send) word 1;bit 0 The status of the CTS handshaking line (received by the controller)
packets sent word 2 The total number of DF1 packets sent by the controller (including
message retries)
packets received word 3 The number of packets received with no errors
undelivered packets word 4 The number of packets that were sent by the controller but not
acknowledged by the destination device
messages retried word 5 Defines the number of times a master station retries either:
•
a message before it declares the message undeliverable, or
•
a poll packet to an active station before the master station
declares that station to be inactive
unused word 6 unused
unused word 7 unused
bad packets not ACKed word 8 The number of incorrect data packets received by the controller for
which an ACK was not returned
unused word 9 unused
duplicate packets received word 10 The number of times the controller received a message packet identical
to the previous message packet
unused word 11 unused
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.
priority scan time maximum word 14 Maximum time in 100 ms increments to scan the Priority Poll List
priority scan time last word 15 The last recorded priority poll scan time (in 100 ms increments)
normal scan time maximum word 16 Maximum time in 100 ms increments to scan the Normal Poll List
normal scan time last word 17 The last recorded normal poll scan time (in 100 ms increments)
unused word 18