S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY
65-0321—01 16
Fig. 23. COM 1 tab.
7. Select Com 2 Tab to setup Com 2. In this example,
Com 2 has been set to monitor one or more boiler sys-
tems. The baud rate must match the baud settings of the
S7810M (9200 baud or 19200 baud). Ensure the Mod-
bus Address range is set high enough for the
address(es) of the S7810M Modbus Module(s) con-
nected to Com 2. Up to 99 Modbus addresses (S7810M
Modbus Modules or combination S7810M Modbus Mod-
ules and UDC controllers) can be monitored by one
S7999D.
Fig. 24. COM 2 tab.
8. The other Com port selections provide:
— Local display to a System Monitor:
when this
option is selected, the Com port then becomes a
Modbus slave to a System Monitor, see Fig 9. In
this figure the Local S7999D IO display would be
the Modbus slaves in the Mobus network. Com 1
of each of the Local displays would be configured
for, “Local display to a System Monitor”. Note that
each of the Local displays must have a unique
Modbus address. When using this option, the
Starting Modbus address
, in the Modbus
address range, becomes the Modbus address for
the Com port. Touch the starting address box to
set Modbus address. The port baud rate can be
set for any baud rate. However, all the baud rates
of the Local displays and the System Monitor dis-
play must be the same. Touch the port baud rate
box to set the baud rate. The other Com port can
be configured for “Fuel/Air Ratio control only
(Commission)” or “One or more boiler systems”.
NOTE: If the Com port is configured for “One or more
boiler systems,” the local display is limited to only
one S7810M Modbus module connected to the
Com port.
— System Monitor to one or more Local displays
:
when this option is selected the Com port
becomes a Modbus master to one or more Local
displays (max of 99) on the Modbus network (see
Fig 9). In this figure the System S7999 OI display
would be the System Monitor. Ensure the Modbus
address range is set high enough to include all
addresses of the Local displays in the network.
The port baud rate can be set for any baud rate.
However, all the baud rates of the Local displays
and the System Monitor display must be the same.
Touch the port baud rate box to set the baud rate.
— Gateway for Modbus master
: when this option is
selected, the Com port acts Modbus gateway for a
third party system (such as a Building Automation
System) to access the Modbus devices (S7810M
Modules) connected to the other Com port. In
essence this feature shares the single Modbus
network between two Modbus masters (S7999D
and a third party Modbus master). (See example
below.) When using this option, the Com port
selected to provide the gateway function doesn’t
need a Modbus address; however, the port baud
rate must match the baud rate of the third party
system.
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