CB FALCON
750-265 76
Fig. 29. Master/Slave data transmission.
Table 34. Slave Data Supporting Lead Lag Parameters.
Parameter Comment
LL - Slave enable Disable, Enable via Modbus, Enable for Master
It enables or disables the “LL Slave” Demand and Rate module.
If the slave mode is set to Disable then:
none of the slave functions are active, LL - Slave Status register is zero, the LL – Master
Service Status register is not writable and is held at zero (this is important for pump control
which might otherwise use values in this location).
The LL - Slave Command register is writable but it is mostly ignored, however the Aux pump
X, Y, and Z are effective for any setting of the LL - Slave enable parameter.
The Enable for Falcon Master option LL - Slave write and LL - Slave read parameters; if
“Enable for Master” is not selected, then these parameters are disabled.
LL - Slave write data
This allows the slave to accept command messages from a master.
LL - Slave read data
This provides the slave status message to be read by a Master. It includes all of the data that
is read from a slave.
LL - Slave mode Use First, Equalize Runtime, Use Last
If set to Use First, then this slave will be used prior to using other slave units with other
values.
If this parameter is set to Equalize Runtime, then this slave will be staged according to a run
time equalization. (Any units set to Use First will precede any that are set to Equalize
Runtime.)
If this parameter is set to Use Last, then this slave will be used only after all Use First and
Equalize Runtime units have been brought online.
MASTER
EnviraCOM INPUTS
SLAVE DATA
OUTDOOR
S2 4-20mA
S5
SENSORS
STAT
READ BY DISPLAY
STAT2
TOD
OUTDOOR TEMPERATURE
OUTLET TEMPERATURE
SLAVE STATUS
SLAVE ACKNOWLEDGE
SLAVES HAVE DEMAND
DEMAND
SUSPEND
FIRING RATE
OFF CYCLE FAN
PUMP X, Y, AND Z
MASTER’S HEAT DEMAND
MASTER’S ACTIVE SERVICE
CH CH FROSTDHW
DHWFROST
CHNONE
TO
PUMP
CONTROL
TO BURNER CONTROL
TO FAN CONTROL
FROST WWSD
SLAVES ARE FIRING
SLAVE HAS PRIORITY
SLAVE IS MODULATING
CH FROST PROTECTION REQUEST
DHW FROST PROTECTION REQUEST
FROST PROTECTION BURNER REQUEST
BURNER CONTROL STATUS
FIRING FOR LOCAL FROST PROTECTION
STATUS
NOT A SEPARATE
REGISTER
TERMINALS
“pRATE” = 0 TO 99.99% OF CAPACITY
TIMEOUT: OLD DATA WILL EXPIRET
INPUT OUTPUT
PARAMETER
DATA ITEM
LEAD LAG ModBus MESSAGE
MINIMUM MODULATION pRATE
MASTER STATUS
BURNER RUN TIME
SLAVE COMPATIBILITY
MODULATION pRATE
MASTER SERVICE STATUS
MASTER COMPATIBILITY
SLAVE
CONTROL
WRITE
SLAVE
CONTROL
READ
MASTER
STATUS
BROADCAST
SLAVE DATA
POLL READ
BASE LOAD pRATE
SLAVE MBH CAPACITY
SLAVE SEQUENCE ORDER
SLAVE MODE
SLAVE ENABLE
SLAVE COMMAND
DEMAND-TO-FIRING DELAY
T
SLAVE DATA POLL (0X2401)SLAVE CONTPOL (0X2400)
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