S7999B SYSTEM DISPLAY
5
65-0283—2
Switchable S7999B Configuration
Fig. 2. Switchable S7999B configuration (S7810M Modbus™).
The S7999B can optionally connect directly to the R7999 from
COM 1 using the cable and installation procedures specified
in the R7999 Product Data Sheet. This connection is from the
COM 1 terminal pins and is only mandatory when
commissioning the R7999. The R7999 can remain connected
to COM 1 following commissioning, but it is considered its own
burner/boiler system, i.e., not part of any other system present
on the S7810 Modbus™ network. This R7999 connection is
called the Local F/A Configuration port.
The Modbus™ network on COM 2 consists of wiring the
S7810M devices together as slaves to the S7999B. An
S7810M device is required for each burner/boiler system. Up
to 99 burner/boiler systems can be connected in this
configuration (unless other slave devices are included in the
Modbus™ wiring). Fig. 3 depicts this wiring.
S7810M
MODBUS
RM78xx
BURNER
CONTROL
S7830
EXPANDED
ANNUNCIATOR
R7999
FUEL AIR
RATIO CONTROL
R7999
FUEL AIR
RATIO CONTROL
S7830
EXPANDED
ANNUNCIATOR
RM78xx
BURNER
CONTROL
RM78xx
BURNER
CONTROL
S7800
S7810M
MODBUS
S7999B
SYSTEM DISPLAY
CONTROLBUS
FCI
M24223
COM 1
COM 2
MASTER
SLAVE
S7810M
MODBUS
CONTROLBUS
SLAVE
SLAVE
UP TO 99
BURNER/BOILER
SYSTEMS
S7800 KEYBOARD DISPLAY CONFIGURED FOR MODBUS.
1
MODBUS BAUD RATE MUST BE SET FOR 19200.
2
1
2