Quincy QGB Series Instruction Manual page 27

The BAUD Rate should be 87K, for
communications with the PLC.
Network Connections
Be sure to set the compressor ID (page 2)
for each compressor in the network before
connecting the compressors with a network
cable.
Next, verify the time and date settings.
If they needs to be changed, follow the
instructions on page 22. If operating in a
network, the time and date must be set on
each compressor. Time and date are only
used to date stamp errors for the shutdown
logs.
notiCe!
If power is removed from the PLC for
more than 120 days, verify the time
and date settings, and reset if lost. No
other data will be lost due to periods
of inactivity, as they are stored in
EEPROM.
PORT
0 -
PORT
Section IV - Operating Procedures
1 -
NETwORKING
DISPLAY PANEL
Quincy Compressor-QGB
notiCe!
If a new control panel is being installed,
the default BAUD RATE may not match
and will need to be set. The keypad
layout is 'soft', so the keys on the
new control panel are not in the same
locations as shown on page 18. Use
the keypad overlay that comes with
the replacement control panel to assist
in the setup. Once communication is
established with the PLC, the keypad
will match the proper key locations.
Once each compressor in the network
has been configured, the PROFIBUS
cable may be connected. The maximum
recommended cable length is 50 feet.
That distance may be extended only if
the compressor's PLC's are 'bonded' with
an eqi-potential wire in addition to the
networking cable (the 'M' terminals of the
PLC's should be connected to balance the
DC connections).
Greater lengths may be connected using
isolated repeaters. Network connection
can be extended up to 3000' with their
use.
All network parameters should be entered
through the 'A' compressor. This will be
the main 'master'. For communications, the
PLC's take the 'master' position briefly to
send data to the others, then relinquish the
network, giving the appearance of a multi-
master system.
™
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