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Chapter 6. Service Request Function
6.21 SVC_REQ 20: Read Fault Tables
Use SVC_REQ 20 to retrieve the entire Controller or I/O Fault Table and return it to the LD program in
designated registers.
The first input parameter designates which table is to be read. A second input parameter (always
zero for the standard Read Fault Tables) is used by the extended format to read a designated fault
entry or to read a range of fault entries. The fault table data is placed in the parameter block
following the input parameters.
The OK output is turned on if the function executes successfully. It is off if the requested operation is
not Read Controller Fault Table (00h), Read I/O Fault Table (01h), Read Extended Controller Fault
Table (80h), Read Extended I/O Fault Table (81h), Read I/O Fault Table with Remote Fault Record
(41h), or Read Extended I/O Fault Table with Remote Fault Record (C1h). The OK output is also
turned off if there is insufficient space in the specified memory reference to accommodate the
requested fault data. If the specified fault table is empty, the function sets the OK output on, but
returns only the fault table header information.
The parameter block is an input and output parameter block. The parameter block comes in two
formats:
▪
Non-Extended: Read Controller Fault Table (00h), Read I/O Fault Table (01h) or Read I/O Fault
Table with Remote Fault Record (41h)
▪
Extended: Read Extended Controller Fault Table (80h), Read Extended I/O Fault Table (81h) or
Read Extended I/O Fault Table with Remote Fault Record (C1h)
6
I/O Fault Table with Remote Fault Record requires RX3i CPU firmware 9.40 or later.
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PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual
6
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GFK-2950C
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