Plant Model - FlwSolve

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Introduction

This tab page on the Plant Model Access Window has a number of parameters that the user may either set or read regarding the SysCAD Solver.

Tag (Long/Short)	Input / Calc	Description/Calculated Variables / Options
Tag	Display	This name tag may be modified with the change tag option.
Condition	Display	OK if no errors/warnings, otherwise lists errors/warnings.
ConditionCount	Display	The current number of errors/warnings. If condition is OK, returns 0.
GeneralDescription / GenDesc	Display	This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then SysCAD will display the UnitType or SubClass.
Spills & Vents (spills and venting are only relevant in dynamic mode)
Spill.Report	Off	Spill messages are off
	On-Messages	Any spills will be reported in the messages portion of the message window.
	On-Conditions	Any spills will be reported in the conditions portion of the message window.
	On-Both	Any spills will be reported in the both the messages and conditions portions of the message window.
Vent.Report	Off	Venting messages are off
	On-Messages	Any venting will be reported in the messages portion of the message window
	On-Conditions	Any venting will be reported in the conditions portion of the message window
	On-Both	Any venting will be reported in the both the messages and conditions portions of the message window
Spill.Action	Ignore	No action will occur if a spill occurs
	Idle-Units	If a spill occurs from a unit, then the model will pause (goto Idle mode)
	Idle-Links	If a spill occurs from a link, then the model will pause (goto Idle mode)
	Idle-Both	If a spill occurs from either a unit or a link, then the model will pause (goto Idle mode)
	Stop-Units	If a spill occurs from a unit, then the model will stop
	Stop-Links	If a spill occurs from a link, then the model will stop
	Stop-Both	If a spill occurs from either a unit or a link, then the model will stop
Vent.Action	Ignore	No action will occur if venting occurs
	Idle-Units	If venting occurs from a unit, then the model will pause (goto Idle mode)
	Idle-Links	If venting occurs from a link, then the model will pause (goto Idle mode)
	Idle-Both	If venting occurs from either a unit or a link, then the model will pause (goto Idle mode)
	Stop-Units	If venting occurs from a unit, then the model will stop
	Stop-Links	If venting occurs from a link, then the model will stop
	Stop-Both	If venting occurs from either a unit or a link, then the model will stop
Spill.Threshold	Input	The mass flow threshold for defining a spill
Vent.Threshold	Input	The mass flow threshold for defining venting
Evaluation Order
TraceChanges	Tickbox
MultiStep Settings
MultiStep.StepCount	Input	Defines the number of steps/iterations to be run when using the MultiStep command or button.
Demand Configuration Please see Demand for more information on this functionality.
BlockInTears	Tickbox	This will block demand logic through all tear streams in a project.
ShowDemandAvail	Tickbox	If this is enabled then the user will be able to view the mass available from a source in Demand mode both up and down stream in all pipes in the project.
DemandThresholdQm	Input	Available from Build 139. The minimum mass flow below which Demand required is not transferred.
DemandWarningTol.SigDigits	Input	The number of significant digits for the demand warning for relative tolerance (-log(DemandWarningTol.Rel)). This will adjust the tag below.
DemandWarningTol.Rel	Input	The relative tolerance used when testing to display condition warnings when a required demand flow is not being met.
DemandWarningTol.Abs	Input	The absolute tolerance used when testing to display condition warnings when a required demand flow is not being met.
Options
PGM_ExecuteTimeout	Input	If the execution of the logic in a controller takes a long time, this is the time after which execution is terminated. It is designed to prevent logic that causes an endless loop from freezing SysCAD. If a timeout error occurs you should review the PGM logic.
RandomSeedAtStart	Input	Seed value used for Random number generator models such as Noise Controller model. For the same seed value, a repeatable set of random numbers will be generated. For a different seed, a different set of random numbers will be generated. Use * to get a random set of values on every run.
Developer Testing Options These options are designed for users of SMDK and Developer License where extra tests are performed on stream mixtures to test data sanity (e.g. test for negative masses of species). In normal use these options should be off so that SysCAD solver does not perform the extra unnecessary checks. The purpose is to help test that SMDK models are performing sensibly.
SanityChecks	Off	Testing of streams for bad data is not performed.
	Messages	Any errors or reported to message window.
	Stop	Any errors or reported to message window, and the solver is stopped at the end of that iteration.
Enthalpy.ForceTotalP	Tickbox
Option to allow the user to disable tear advance
Hold.TearAdvance	Tickbox	sets tears with fixed current values, so to eliminate effects from tears.
Options to allow the user to disable control & similar actions
Hold.ControlActions	Tickbox	Ticking this will disable all control actions, useful for debugging the project, to eliminate effects from controllers (e.g. PID controllers).
Hold.DiscreteActions	Tickbox	Ticking this will disable all discrete actions, useful for debugging the project, to eliminate effects from discrete actions.
Hold.MPsActions	Tickbox	Ticking this will disable all MP files, useful for debugging the project, to eliminate effects from model procedures.
Hold.TagIOActions	Tickbox