Rockwell Automation 1747-PCIS API Software - Open Controller - Manual (Page 91)

Publication 1747-UM002A-US-P - June 2000
Library of Routines 6-31
0/7 to 0/12 reserved
0/13 dynamic configuration Major error halted bit
This bit is set by the scanner when a major error is encountered.
The scanner enters a fault condition. Word 2, Fault Code will
contain a code which can be used to diagnose the fault condition.
When bit 0/13 is set, the scanner places all outputs in a safe state
and sets the Status LED to the fault state (flashing red).
Once a major fault state exists, the condition must be corrected and
bit 0/13 cleared before the scanner will accept a mode change
request.
0/14 reserved
0/15 status First pass bit
The bit is set by the scanner to indicate that the first I/O scan
following entry into Scan mode is in progress. The scanner clears
this bit following the first scan.
1/0 to 1/10 reserved
1/11 status Battery low bit
This bit is set by the scanner when the Battery Low LED is on. It is
cleared when the Battery Low LED is off.
1/12 status DII overflow bit
This bit is set by the scanner when a DII interrupt occurs and the
scanner is unable to successfully transmit the DII Received priority
message to the host.
1/13 to 1/15 reserved
2 status Major error fault code
A code is written to this word by the scanner when a major error
occurs. See word S:0/13. The code defines the type of fault. If not
zero, the upper byte indicates the slot associated with the error.
This word is not cleared by the scanner.
3 to 4 dynamic configuration I/O slot enables
These two words are bit mapped to represent the 30 possible I/O
slots in an SLC 500 system. Bits 3/0 through 4/14 represent slots
0-30 (slot 0 is reserved for the 1746 I/O PCI Interface). Bit 4/15 is
unused.
When a bit is set (default condition), it allows the I/O module in the
referenced slot to be updated in the I/O scan. When a bit is cleared,
the corresponding I/O module will no longer be included in the I/O
scan.
Changes to the I/O slot enable bits will take affect at the end of the
next I/O scan.
5 status Maximum observed scan time
This word indicates the maximum observed interval between
consecutive I/O scans. The interval time is reported in units of 250
ms.
Resolution of the observed scan time is +0 to -250 ms. For example,
the value 10 indicates that 2.25-2.5 ms was the longest scan time.
6 dynamic configuration Index register
This word indicates the element offset used in indexed addressing.
Word/Bit: Classification: Description: