Rockwell Automation T3831 ICS Regent Communications Package for Winterpret - Manual (Page 24)

Communications Package for W INTERPRET (T3831)
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Industrial Control Services
After the Start Network command is performed, the Regent
will begin issuing poll commands over the Net Master port to
each Regent on the GPL communications network. When a
Net Master has been started, and all other Regents are
connected, The GPL should be fully functional (ignoring any
hardware, cabling or configuration error problems). When a
GPL Net Master is scanning, the system variable
GPLMSTRSCAN is on in the Regent that has the Net Master
port.
The GPL activity can be observed by watching the transmit
and receive LEDs on the associated communications module
port(s). Each time the Net Master issues a poll command to a
Regent (including itself) its Transmit LED turns on and the
associated Receive LEDs at each Regent also turn on. The
polled Regent then responds by broadcasting its data packet
(its Transmit LED turns on), and each Regent receives the
data packet (their Receive LEDs turn on). This poll and
response repeats for each node of the GPL network. After
every Regent is polled the entire GPL cycle is repeated.
Each Regent contains system variables to report the receipt of
data from each GPL node. These variables are named
GPLDATA01 through GPLDATA32 and correspond to the
Regent node numbers 1 through 31. The GPLDATAxx
variables for each configured node on the network will
normally be on when GPL communications are operating
correctly. When a Regent stops receiving valid data from a
particular node over all of the network legs the corresponding
GPLDATAxx variable will turn off.
For example if a GPL network with dual legs is fully
operational, and then the Disconnect Network command is
performed on node 3, the system variable GPLDATA03 will
turn off at all of the other Regents, because node 3 does not
broadcast its data on any leg of the network when it is
deactivated.
Stop Network
The Stop Network command deactivates the Net Master
function for a Regent that has a Net Master port. When the
Net Master is stopped, it no longer issues poll commands over
the leg of the network it manages.