Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 155)

Publication AG-UM008C-EN-P - February 2005
Configuring SLC 5/03, 5/04, and 5/05 Processors 4-17
Monitor Active Stations
To see what stations are active, view the channel 0 active node table
in the SLC 5/03, 5/04, or 5/05 processor status file (S:67/0-S:82/15).
Each bit in the file represents a station on the link. The stations are
numbered in order as a continuous bitstream file starting with the first
bit in word S:67 (see the figure below).
Figure 4.3 Example Active Node Table
At powerup or after reconfiguration, the master station assumes that
all slave stations are inactive. A station is shown active only after it
responds to a poll packet.
Undelivered Messages word 3 The number of messages that were sent by the processor but not
acknowledged by the destination device
Duplicate Messages
Received word 9 The number of times the processor received a message packet identical to
the previous message packet
Bad Packet/No ACK word 7 The number of incorrect data packets received by the processor for which no
ACK was returned
Max Normal Poll List Scan word 6 Maximum time in 100 ms increments to scan the Normal Poll List
Max Priority Poll List Scan word 13 Maximum time in 100 ms increments to scan the Priority Poll List
DTR (Data Terminal Ready) word 0;bit 4 The status of the DTR handshaking line (asserted by the processor)
DSR (Data Set Ready) word 0;bit 2 The status of the DSR handshaking line (received by the processor)
RTS (Request to Send) word 0;bit 1 The status of the RTS handshaking line (asserted by the processor)
CTS (Clear to Send) word 0;bit 0 The status of the CTS handshaking line (received by the processor)
DCD (Data Carrier Detect) word 0;bit 3 The status of the DCD handshaking line (received by the processor)
Status Field Diagnostic File Location Definition