Bryan Boilers 250, & 300, 200 Sequencer 1 Minute Event, Forced Lead Rotation, Slave Write Data

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

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Date: 8-4-2010

Revision: 0

Form: 2396

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.