S90-010 CS (APR 08) FRICK
®
QUANTUM™ COMPRESSOR CONTROL PANEL
Page 48 COMMUNICATIONS SETUP
QUANTUM™ DATA TABLE
Allen-Bradley and Modbus Data Access
Data passed to and from the Quantum™ are integer
values with one decimal field assumed unless shown
otherwise or the command is sent to select two decimal
fields. For example, if the data’s value is 25.5 then the
value 255 is sent. All temperatures are in degree C and all
pressures are in PSIA unless the command is sent to
select the units of the panel. A mode such as Slide Valve
mode is sent as an integer value that represents the mode
it is in. For example, a 0 is sent if it is in manual, or a 10 is
sent if it is in automatic, or a 20 is sent if it is in remote.
The value zero (0) is used to represent an
OFF
status and
a
DISABLED
option. The value one (1), which is received
as a 10, is used to represent an
ON
status and an
ENABLED
option. Only data values that are designated as
setpoints are modifiable.
Read Only
is used to help
identify what data is not modifiable. The setpoint range is
checked to see if it is an allowed setting.
If it is not allowed, the setting is not changed. Reference
the
Frick
®
Quantum™ Control Panel Maintenance
S90-010
M for the setpoints default settings and ranges. Reference
the
Quantum™ Data Table
in this manual for the address
listing and description of data.
A command has been provided that selects whether data
to and from the Quantum™ will be integer values with
either one or two decimal fields assumed. Another
command has been provided that selects whether data to
and from the Quantum™ will be returned in the units that
are the default (pressure in PSIA and temperature in
Degree C) or in the units that are selected to display at the
panel.
Modbus Addressing Note:
When using Modbus protocol (other than the
Hyperterminal example shown earlier), it is necessary to
use the Modbus Address as shown in the following tables.
These addresses should work for most applications.
