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seconds after the last unsuccessful scan. In the case where only ExCEL is
trying to access the module, ExCEL must access the module frequently
enough for the error to persist.
SERIAL PORT J6 ExCEL
OK TRANSACTIONS
NO. OF DATA BLOCKS
NO. OF MESSAGES/SCAN
LINK SCAN TIME (MS)
INPUT QUEUE
OUTPUT QUEUE 0
SERIAL PORT J7 ExCEL
OK TRANSACTIONS
NO. OF DATA BLOCKS
NO. OF MESSAGES/SCAN
LINK SCAN TIME (MS)
INPUT QUEUE
OUTPUT QUEUE
Figure 7-4. Interaction Page 11, Serial Port Status Display.
Black highlighting indicates that no I/O module is present and no process is
attempting to access that address. Note that if two modules are present at the
same address, the DPU will not be able to communicate with either module
and the display will indicate that no module is present.
The Last Bad Module statistic field displays the address and time of the most
recent unsuccessful I/O scan.
Event Queue Pointer Information
Interaction page 10 also contains Event Queue pointer information. The
Event Queue is an internal DPU buffer used to store events such as Sequence
of Events entries, process alarms, remote diagnostic alarms, time updates,
and operator edit actions. The Event Queue pointer table shows the memory
address (in hex) of the last event placed in the queue by the DPU (i.e., PUT
XXXXXX YY), and the memory location of the last event removed from the
queue by each of the 31 possible high traffic loop stations during normal
operation (e.g., 01 XXXXXX YY). The last two digits in the field indicate
how many times the queue has wrapped around.
Metso Automation MAX Controls • • • • 277573 • • • •
Using Interaction Pages
0
BUFFER OVERRUNS
CHECKSUM ERRORS
0
FAILED TO SENDS
0
LINK LEVEL ERRORS
0
RETRIES
TIMEOUTS
0
UNEXPECTED CHARACTERS
LAST NAK CODE
0
BUFFER OVERRUNS
CHECKSUM ERRORS
0
FAILED TO SENDS
0
LINK LEVEL ERRORS
0
RETRIES
TIMEOUTS
0
UNEXPECTED CHARACTERS
0
LAST NAK CODE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7-7
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