Modulated Boiler (v1.5)
Full Name
Lib.Mervis.v1_5.ModulatedBoiler
Description
Block used for controlling the performance of a boiler with a modulated burner and a circulation pump.
Required Project References
- Lib.Mervis
Usage in ST
program test
var
modulatedBoiler: lib.mervis.v1_5.ModulatedBoiler;
end_var
modulatedBoiler();
end_program
Description of Inputs and Outputs
| Inputs | Name | Data Type | Retain | Required Connection | Meaning |
| OperatingMode | Lib.Mervis.v1_0.OperatingModeType | Yes | No | Boiler operating mode | |
| PumpOperatingMode | Lib.Mervis.v1_0.OperatingModeType | Yes | No | Circulation pump operating mode | |
| ManualPower | real | Yes | No | Boiler power in manual mode | |
| OutputTemperature | real | No | Yes | Output temperature | |
| BoilerDemand | Lib.Mervis.v1_1.StageControlType | No | Yes | Combined boiler demand from the cascade controller | |
| Running | bool | No | No | Feedback signal of boiler operation | |
| Failure | bool | No | No | Feedback signal of boiler failure | |
| PumpRunning | bool | No | No | Feedback signal of circulation pump operation | |
| PumpFailure | bool | No | No | Feedback signal of circulation pump failure | |
| ResetRuntime | bool | No | No | Reset runtime hours | |
| MinimalOutput | real | No | No | External input for defining the minimum output temperature (if zero, it is not used) | |
| Xp | real | No | No | PI controller - proportional band | |
| Ti | real | No | No | PI controller - integral time | |
| MaxOutputTemperature | real | No | No | Maximum output temperature, exceeding it is considered a fault | |
| FailureDelay | time | No | No | Interval waiting for active boiler operation feedback | |
| FailureCountLimit | uint | No | No | Number of consecutive boiler errors before it is permanently marked as non-functional | |
| FailureTimeout | time | No | No | Time after an unsuccessful boiler start before retrying | |
| LimitingXp | real | No | No | PI controller for limiting the maximum output temperature - proportional band | |
| LimitingTi | real | No | No | PI controller for limiting the maximum output temperature - integral time | |
| UseLocalOutputTemperature | bool | No | No | Determines whether the control uses the common output temperature or its own (= true) | |
| RunTimeSource | Lib.Mervis.v1_0.RunTimeSourceType | No | No | Determines how the boiler runtime hours are counted | |
| PumpRunDownTime | time | No | No | Run-down time of the circulation pump after the boiler is removed from the cascade | |
| PumpFailureDelay | time | No | No | Interval waiting for active circulation pump operation feedback |
| Outputs | Name | Data Type | Meaning |
| State | Lib.Mervis.v1_1.StageInfoType | Combined boiler state to the cascade controller | |
| Demand | real | Required boiler power | |
| PumpDemand | bool | Command for the circulation pump | |
| RunTimeInHours | udint | Boiler runtime in whole hours | |
| FailureOutput | bool | Boiler fault | |
| PumpFailureOutput | bool | Circulation pump fault | |
| AlarmsStatus | Lib.Mervis.v1_0.AlarmsStatus | Combined interface for alarm indication | |
| RunTime | time | Boiler runtime |
| Blocks | Name | Data Type | Meaning | ||||||||||||||||||||
| FailureFb | Lib.Mervis.v1_0.FailureDetector | Block for evaluating boiler failure | |||||||||||||||||||||
| Alarms | Lib.Mervis.v1_0.AlarmsExtender4 | Alarm function block | Alarm Input | Priority | Meaning | Alarm1 | 32/33 | Boiler fault | Alarm2 | - | Not used | Alarm3 | 32 | Pump fault | Alarm4 | 33 | Boiler overheat | ||||||
Detailed Function Description
TODO