[SplyChw23] Supply chain chilled water, data exchange with other plants, with setpoint evaluation of chilled water demand
Program block, name / node subtype: [SplyChw23] Supply chain chilled water, data exchange with other plants, with setpoint evaluation of chilled water demand
Library hierarchy: Coordination
Family: SplyChw
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Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
SplyChw23 connects the cooling plant with consumers and/or lower level coordinator(s).
The most important functions in the program block are:
- Cooling demand collection and evaluation
- Chilled water temperature setpoint collection and evaluation
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
SpCReq | Setpoint for cooling request | ACalcVal: Analog calculated value | N/A | N/A | |
CReq | Cooling request | BCalcVal: Binary calculated value | N/A | N/A | |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
SpCReqMax | Maximum setpoint cooling request | ACnfVal: Analog configuration value | N/A | N/A | |
SpCReqOfs | Offset for setpoint cooling request | ACnfVal: Analog configuration value | N/A | N/A | |
Dmd(1) | Demand (1) | Chart | N/A | N/A | |
Dmd(2) | Demand (2) | Chart | N/A | N/A | |
Dmd(3) | Demand (3) | Chart | N/A | N/A | |
Dmd(4) | Demand (4) | Chart | N/A | N/A | |
Dmd(5) | Demand (5) | Chart | N/A | N/A | |
Dmd(6) | Demand (6) | Chart | N/A | N/A | |
Dmd(7) | Demand (7) | Chart | N/A | N/A | |
Dmd(8) | Demand (8) | Chart | N/A | N/A | |
Cooling demand collection and evaluation
SplyChw23 receives binary chilled water demand signals [ChwDmd1...n] from other coordinator(s) via chart input pins, and calculates a binary value for the cooling request output pin [CReq]. If at least one chilled water demand signal is True, [CReq] is True.
Chilled water temperature setpoint collection and evaluation
SplyChw23 calculates a supply temperature setpoint request value [SpCReq] for the chilled water system based on suggested setpoint values received from other consumers or coordinators. The calculated setpoint is the minimum of all incoming setpoints that have no disturbance and are accompanied by an active chilled water or free cooling demand.
In addition, a maximum temperature limit SpCReqMax and an offset value SpCReqOfs apply to the calculated setpoint.
Free cooling
SplyChw23 receives binary free cooling demand signals [FreeCDmd1...n] from other coordinator(s) via chart input pins, and calculates a binary value for the free cooling request output pin [FreeCReq]. If at least one free cooling demand signal is True, [FreeCReq] is True.