12.6 Monitoring The Ethernet Interface Status Bits - GE RX3i User Manual

Chapter 12. Diagnostics
Controller Fault
Module state doesn't permit
Comm_Req; discarded
Unsupported feature in
configuration
Can't locate remote node;
discarded request
Mailbox Queue full – Comm_req
aborted
Non-critical CPU software event

12.6 Monitoring the Ethernet Interface Status Bits

The Ethernet Interface status bits occupy a single block of memory, which is specified when the Ethernet
Interface is configured. The Ethernet Interface updates the status bits in the CPU once each controller scan.
These bits can be used to prevent initiation of a COMM_REQ function when certain errors occur or to signal a
problem on an established channel.
The first 16 bits of the block are the LAN Interface Status (LIS) bits. The next 64 bits are Channel Status bits (2 for
each channel). If the LAN Interface OK bit (bit 16) is not set, the other status bits are invalid.
Note: The original information is located in GFK-2224L, TCP/IP Ethernet Communications for
PACSystems RX3i and RX7i from June 2013.
Note: For CPE330:LAN1 is the LAN (NIC) that contains the unswitched port in the CPE330. This is
the port similar to the CPE310. This port negotiates up to 1 Gbps. LAN2 is the LAN (NIC)
that contains the switched ports in the CPE330. There are 2 ports in this LAN. These ports
negotiate up to 1 Gbps.
214 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual
User Action
COMMREQ received when Ethernet Interface cannot process COMMREQ.
Make sure Ethernet Interface is configured and online. Error may occur if
the logic application is sending COMMREQs faster than the Ethernet
Interface can process them. Reduce the rate at which COMMREQs are sent.
PLC firmware does not support Ethernet communications software or
attempt has been made to configure a feature not supported by the
Ethernet Interface. Check CPU and Ethernet Interface revisions, order
upgrade kit for CPU and/or Ethernet Interface.
A specified remote device does not exist on the network. Check that the
remote device IP address is correct and that the remote device is
functioning properly.
The CPU is attempting to send COMMREQs faster than the Ethernet
Interface can receive them. The PLC logic program should retry the
COMMREQ after a short delay. If the condition persists, the logic application
should be revised to reduce the rate at which it sends COMMREQs to the
Ethernet Interface.
The CPU is attempting to send mail messages faster than they can be
retrieved by the Ethernet Interface; the messages are discarded. This can
result in subsequent "Backplane communications with controller fault; lost
request" faults.
GFK-2224Q