3D TRASAR
5500 - Installation & Operation Manual
521-OM0108.88
Copyright
2009 Nalco Company
Technical Help
(630) 305-CHEM
E-1
Appendix E: SCADA and LAN
SCADA - General
The 3D TRASAR Controller provides a Modbus RTU Slave connection. Users can select either an
RS-232 or RS-485 hardware link (choose one). Asingle 3-pin SCADA connector is provided in the
Controller (plug-in to selected communications port).
Master and Slave (3D TRASAR Controller) Communications
Configuration Item
Parameters
Protocol
Modbus RTU
Communications
Half-duplex (2-wire)
Baud Rate (selectable)
1200, 2400, 4800, 9600,
or 19200
Data Bits
8 Bit
Parity
None
Stop Bits
1
3D TRASAR Display Configuration Guide
3D TRASAR Display Configuration Guide
1)
Press the
Menu
soft key.
2)
Select
Preferences
option.
3)
Enter password from the Password Screen (12345 is the default).
4)
From the Preferences screen, arrow down to the 2
nd
screen.
5)
SCADA Addr
(0 – 99 is currently supported, 10 is the default). Make selection.
6)
SCADA Mode
(RS232 or RS485). Make selection.
7)
SCADA Baud
(1200, 2400, 4800, 9600, 19200). Make selection.
8)
Press the
Information
soft key.
9)
Select
Operating Data
.
10)
Cycle 3D TRASAR Controller power.
Configuration Item
Parameters
Polling Interval/Block Reads
5-10 seconds (10 seconds is
recommended, as signals do not
change frequently)
Message Timeout/Retry
Half-duplex (2-wire)
The 3D TRASAR Controller supports block reads. It is recommended to always read information in
Coil, Word, Long, and Float blocks (to minimize Controller communication traffic). Floating point
numbers are formatted using the Modicon Protocol convention (two consecutive 16-bit registers.
Note
: Daniel’s Floating Point Extension is not supported.
Modbus Master Polling/Retry Parameters
