Using Status Data For Troubleshooting; Clearing The Rx3I Fault Tables - Emerson PACSystems RX3i User Manual

User Manual
GFK-2911E

Using Status Data for Troubleshooting

There are three main types of status data available to the RX3i application program:
1. FT Output of the COMMREQ Function Block: This output is set if there is a programming
error in the COMMREQ Function Block itself, if the rack and slot specified in the
COMMREQ SYSID parameter is not configured to contain an Ethernet interface, or if the
data block length specified in the Command Block is out of range. This output also may
indicate that no more COMMREQ functions can be initiated in the ladder program until
the Ethernet interface has time to process some of the pending COMMREQ functions.
If the FT Output is set, the CPU does not transfer the Command Block to the Ethernet
interface. Under these circumstances, the other status indicators are not updated for this
COMMREQ.
2. Status Bits: The status bits are updated in the RX3i CPU once each PLC scan by the
Ethernet interface. These bits are generally used to prevent initiation of a COMMREQ
function when certain errors occur or to signal a problem on an established channel.
The status bits include the LAN Interface Status bits and the Channel Status bits. The
starting location of these bits is set up when the module is configured.
3. Communications Status Word: The COMMREQ Status word (CRS word) provides
detailed information on the status of the COMMREQ request. The communications
status word is not updated in the CPU each scan as are the status bits. They are generally
used to determine the cause of a communication error after the COMMREQ function
has been initiated. The cause is reported in the form of an error code. The COMMREQ
Status word (CRS word) is returned from the Ethernet interface to the RX3i CPU
immediately if the Command Block contains a syntax error or if the command is local.
The location of the CRS word is defined in the Command Block for the COMMREQ
function. See Table 37

Clearing the RX3i Fault Tables

Clearing the RX3i CPU's I/O fault tables has no effect on the EDS001. This action merely
clears the I/O Fault Table temporarily; nor does it clear the EDS001 log information.
Diagnostics
• The LAN Interface Status (LIS) Bits monitor the health of the Ethernet interface
itself, such as the LAN Interface OK bit.
Chapter 5
Sep 2019
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