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Date: 8-4-2010
Revision: 0
Form: 2396
StagingOrder numbers of all Firing boilers. If
only one Firing boiler is found, or none are
found, then this selection function returns a
value that indicates no boiler may be dropped.
Otherwise it returns an identifier for the boiler
having the highest StagingOrder number.
SEQUENCER 1 MINUTE EVENT
Part of the sequencer is called by the timing
service at a 1 minute rate to implement lead
rotation.
The 1 minute event checks the boiler identified
by Lead- BoilerSeqNum. If it is Firing then the
LeadBoilerRunTime is incremented.
FORCED LEAD ROTATION:
When the boiler identified by
LeadBoilerSeqNum is firing and also
LeadBoilerRunTime reaches the Force lead
rotation time parameter time then:
1. The current lead boiler is noted.
2. Lead rotation occurs as described above
under Voluntary Lead Rotation (this changes the
designation, but does not change the actual
firing status).
SLAVE WRITE: DATA
This allows the slave to accept command
messages from a Sola master
SLAVE READ: DATA
This provides the slave status message to be
read by a Sola Master. It includes all of the data
that is read from a slave.
SLAVE MODE: USE FIRST, EQUALIZE
RUNTIME, USE LAST
• If set to Use First, then this slave Sola will be
used prior to using other slave Solas with other
values.
• If this parameter is set to Equalize Runtime,
then this slave Sola will be staged according to a
run time equalization. (Any Solas set to Use
First will precede any that are set to Equalize
Runtime.)
• If this parameter is set to Use Last, then this
slave Sola will be used only after
• all Use First and Equalize Runtime Solas have
been brought online.
SLAVE PRIORITY SEQUENCE ORDER: 0-255
Slave sequence order is used to determine the
order in which the slave Solas will be used
(staged on) for those Solas with the same Slave
mode setting. Numbers may be skipped, that is
3 will be first if there is no 1 or 2.
NOTE: For Equalize Runtime purposes, 1 does
not mean the Sola will be used first every time;
that will vary over time based on the master's
run time equalization scheme. In this case the
sequence number determines the relative order
in which Sola controls will be used in a round-
robin scheme.
If the slave sequence number value is zero, then
the slave Sola's ModBus address will be used
instead.
If two Solas are set the same mode and both
have the same sequence number then an alert
will occur and the order in which they are used
will be arbitrary and is not guaranteed to be
repeatable.
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