Rockwell Automation T3831 ICS Regent Communications Package for Winterpret - Manual (Page 31)

Communications Package for W INTERPRET (T3831)
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one can easily isolate the GPL fault to a particular leg of the
GPL network.
Third, a local fault bit named GPLFLTLOCAL will turn on if
the Regent detects that the fault is caused locally by one of its
own communications modules. Depending on the type of
communications module failure and the function of the port
(i.e. Net Master or Net Slave) the Regent may not always be
able to determine that its local communications module is the
source of the fault. However, the GPLPxFAULT bits will
indicate the communications port where there is either a local
or external fault.
The transmit and receive LEDs on each GPL communications
port also provide assistance in troubleshooting the GPL
communications activities. On each GPL port, these LEDs
should be flashing as GPL poll commands and data packets
are communicated over the GPL network legs.
Troubleshooting Methods
When GPL faults occur, you should check the status of the
GPL system variables first. Since these variables can be
monitored remotely via communications with W
INTERPRET or
an external operator interface, they can quickly provide
information about the GPL error.
Determine if each Regent is still communicating over GPL.
The GPLDATAxx bits will indicate if each node is still
communicating successfully over at least one leg of the
network.
Determine which leg of the network is faulted. Examine the
GPLPxFAULT bits to determine the port numbers and
examine your systems cable diagram to identify the GPL
network leg associated with the port errors.
Determine if a Regent reports a local fault with its
GPLFLTLOCAL variable.
Examine the transmit and receive LEDs on each
communications port of the network leg that is faulty. By
observing the LED activity at each Regent, you can
determine where along a network cable you may have a cable
fault. Regents on the Net Master side of a cable fault will still
have both transmit and receive activity. Regents on the other