S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY
65-0321—01 6
Fig. 3. Wiring diagram for commissioning the Fuel/Air
Ratio Control example.
ONE OR MORE BOILER SYSTEMS
The S7999D manages a series of Modbus™ nodes (up to 99
addresses) consisting of 7800 SERIES Burner Controls,
ControLinks™, and UDC devices (see Fig. 2).
• Addressing the Modbus™ nodes or systems
In the One or More Boiler Systems setup, addressing the
Modbus™ nodes is done manually, and careful Modbus™
addressing is required because duplicate addresses aren't
allowed. Manual assignment of UDC controllers to their
respective systems is required.
M33873
CONTROLINKS
CONTROLLER
R7999
A B C
A B C A B C COM POWER
S7999D OI DISPLAY
3
1
S7810M
MODBUS
MODULE
C A B
6 7 8
2
“C” TERMINALS ARE CONNECTED INTERNALLY TO 24 VAC “COM”.
3
SEE 65-0249 FOR MULTIPLE S7810M NETWORK CONNECTIONS.
4
MODBUS BAUD RATE MUST BE SET FOR EITHER 9600 BAUD OR 19200 BAUD.
5
SEE 65-0238 FOR R7999 WIRING.
6
120 Ω, 1/4 WATT RESISTOR BETWEEN TERMINALS A AND B OF THE MODBUS AT
THE FARTHEST S7810M MAY BE NECESSARY FOR LONG RS-485 RUNS.
7
4
5
CONNECT SHIELD TO EARTH GROUND.
1
SEE 65-0249 FOR CONTROL BUS (LOCAL RS-485 COMMUNICATION BUS) WIRING.
2
1
COM 1
COM 2
24 VAC
3
8
TO PROTECT AGAINST CONDUCTED AND RADIATED TRANSIENT NOISE, USE
CLAMP FILTERS (INCLUDED IN 50063482-001 BAG ASSEMBLY) AS ILLUSTRATED
IN FIGURES ON PAGE 2.
9
BAUD RATE COMMISSIONING THE FUEL/AIR RATIO CONTROL MUST BE SET FOR
4800 BAUD.
8
9
120V
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