S7999B SYSTEM DISPLAY
7
65-0283—2
Fig. 4. Switchable S7999B configuration with UDC controllers.
UDC controllers may be added to the switchable configuration
(see Fig. 4). The UDC controllers share the Modbus™ with
the S7810M devices, so the total number of burner/boiler
systems is reduced by the number of UDC controllers on the
network. A combined total of 99 devices are permitted on the
Modbus™ network. Wiring for this configuration is shown in
S7810M
MODBUS
RM78xx
BURNER
CONTROL
S7830
EXPANDED
ANNUNCIATOR
R7999
FUEL AIR
RATIO CONTROL
R7999
FUEL AIR
RATIO CONTROL
S7830
EXPANDED
ANNUNCIATOR
RM78xx
BURNER
CONTROL
UDC2500
THERMAL
SHOCK
S7810M
MODBUS
S7999B
SYSTEM DISPLAY
CONTROLBUS
FCI
M24224
COM 1
COM 2
MASTER
SLAVE
S7810M
MODBUS
UP TO 99
BURNER/BOILER
SYSTEMS AND
UDC CONTROLLERS
CONTROLBUS
SLAVE
SLAVE
UDC2500
PID LOAD
CONTROL
SLAVE
UDC2500
STEAM/FUEL
FLOW
SLAVE
SLAVE
RM78xx
BURNER
CONTROL
S7800
1
S7800 KEYBOARD DISPLAY CONFIGURED FOR MODBUS.
1
MODBUS BAUD RATE MUST BE SET FOR 19200.
2
2