[HCGenCtl21] Sensors, setpoint and control for single heating and cooling generator

Program block, name / node subtype: [HCGenCtl21] Sensors, setpoint and control for single heating and cooling generator

Library hierarchy: Universal equipment

Family: HCGenCtl

Project tree	Diagram

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.

Function

Performs setpoint coordination for the hot water flow temperature and for the chilled water flow temperature.

Controls the charging state of a hot water storage tank and a chilled water storage tank (each with 4 temperatures) (CrgReqStk21).

When the function is switched on (the heating and cooling generation plant is "On") and one of the storage tanks needs to be charged, the energy producer is switched on and receives the corresponding setpoints.

The setpoint for the hot water temperature control is increased by a small offset defined by an analog configuration value, and the slightly higher setpoint for the hot water temperature is sent to the energy generator(s).

The setpoint for the chilled water temperature control is reduced by a small offset defined by an analog configuration value. The slightly lower setpoint for the chilled water temperature is sent to the energy generator(s).

Unlike the control logic for hot water temperature, where the collection of setpoint requests for the hot water temperature setpoint (which may change while following the requests) is very likely to occur, there is a fixed setpoint for the logic for chilled water temperature control. Normally, the refrigeration machines and the chilled water system are designed for a defined temperature level that should not be affected by the consumers.

This program block has the following optional functions:

Option: Return temperature (1xAI)

Creates an analog input for the outside air temperature and reads its signal.

Option: Setpoint hot water temperature

A configuration value that can be used when no requests or only binary requests are collected from the consumers across the supply chain for the hot water function.

Mandatory elements

Name	Description	Type	Alarm / Notification class	Trend / Type
TMnFlCnsHw	Main flow temperature consumer side, hot water	AI: Analog input	No	Yes, 2
TMnRtCnsHw	Main return temperature consumer side, hot water	AI: Analog input	No	Yes, 2
PrSpTHw	Present setpoint hot water temperature	ACalcVal: Analog calculated value	No	No
DiffSpTHwGen	Temperature difference setpoint for hot water generator	ACnfVal: Analog configuration value	N/A	No
HwStk	Hot water storage tank	[CrgReqStk21] Charge request storage tank, 4 temperature sensors	N/A	N/A
TMnFlCnsChw	Main flow temperature consumer side, chilled water	AI: Analog input	No	Yes, 2
TMnRtCnsChw	Main return temperature consumer side, chilled water	AI: Analog input	No	Yes, 2
SpTChw	Setpoint chilled water temperature	ACnfVal: Analog configuration value	N/A	No
PrSpTChw	Present setpoint chilled water temperature	ACalcVal: Analog calculated value	No	No
DiffSpTChwGen	Temperature difference setpoint for chilled water generator	ACnfVal: Analog configuration value	N/A	No
ChwStk	Chilled water storage tank	[CrgReqStk21] Charge request storage tank, 4 temperature sensors	N/A	N/A

See also

Optional elements

Name	Description	Type		Alarm / Notification class	Trend / Type
SpTHw	Setpoint hot water temperature	SpTHw: Setpoint hot water temperature		No	Yes, 2
TOa	Outside air temperature	AI: Analog input		No	Yes, 3

See also