Using Status Data For Troubleshooting - Emerson PACSystems RX3i User Manual

User Manual
GFK-2949E
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Refer to Appendix C: for more details, or other log messages.
5.4.2

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
2. Status Bits: The status bits are updated by the Ethernet interface in the RX3i CPU
3. The LAN Interface Status (LIS) Bits monitor the health of the Ethernet interface itself,
4. Communications Status Word: The COMMREQ Status word (CRS word) provides
Configuration of IEC-104 Server Parameter
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 may also 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.
reference table once each Controller scan. 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.
such as the LAN Interface OK bit.
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. Refer to Section 5.13.
Chapter 5
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