GE PACSystems RX7i Cpu Programmer's Reference Manual page 318

SVC_REQ 15 Example 2
The CPU is shut down when any fault occurs on an I/O module
except when the fault occurs on modules in rack 0, slot 9 and in
rack 1, slot 9. If faults occur on these two modules, the system
remains running. The parameter for table type is set up on the
first scan. The contact IO_PRES, when set, indicates that the I/O
Fault Table contains an entry. The CPU sets the normally open
contact in the scan after the fault logic places a fault in the
table. If faults are placed in the table in two consecutive scans,
the normally open contact is set for two consecutive scans.
The example uses a parameter block located at %R0600. After
the SVC_REQ function executes, the second, third, and fourth
words of the parameter block identify the I/O module that
faulted:
High Byte
%R0600
%R0601 reference address memory type
%R0602 reference address offset
%R0603 slot number
%R0604 block (bus address)
%R0605
%R0606 fault data
In the program, the EQ_INT blocks compare the rack/slot
address in the table to hexadecimal constants. The internal coil
%M0007 is turned on when the rack/slot where the fault
occurred meets the criteria specified above. If %M0007 is on,
its normally closed contact is off, preventing the shutdown.
Conversely, if %M0007 is off because the fault occurred on a
different module, the normally closed contact is on and the
shutdown occurs.
GFK-2950C
Chapter 6. Service Request Function
Low Byte
1
long/short
rack number
I/O bus no.
point address
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