Chapter 6. Service Request Function310 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C6.21 SVC_REQ 20: Read Fault TablesUse SVC_REQ 20 to retrieve the entire Controller or I/O Fault Table and return it to the LD program indesignated registers.The first input parameter designates which table is to be read. A second input parameter (alwayszero for the standard Read Fault Tables) is used by the extended format to read a designated faultentry or to read a range of fault entries. The fault table data is placed in the parameter blockfollowing the input parameters.The OK output is turned on if the function executes successfully. It is off if the requested operation isnot Read Controller Fault Table (00h), Read I/O Fault Table (01h), Read Extended Controller FaultTable (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 alsoturned off if there is insufficient space in the specified memory reference to accommodate therequested fault data. If the specified fault table is empty, the function sets the OK output on, butreturns only the fault table header information.The parameter block is an input and output parameter block. The parameter block comes in twoformats:▪ Non-Extended: Read Controller Fault Table (00h), Read I/O Fault Table (01h) or Read I/O FaultTable with Remote Fault Record (41h)6▪ Extended: Read Extended Controller Fault Table (80h), Read Extended I/O Fault Table (81h) orRead Extended I/O Fault Table with Remote Fault Record (C1h)6.6 I/O Fault Table with Remote Fault Record requires RX3i CPU firmware 9.40 or later.
