[CrgReqStk21] Charge request storage tank, 4 temperature sensors

Program block, name / node subtype: [CrgReqStk21] Charge request storage tank, 4 temperature sensors

Library hierarchy: Universal equipment

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

Controls the charging state of a storage tank by reading 4 temperatures and comparing them to a setpoint. T1 is near the top of the tank and T4 is near the bottom of the tank. The present setpoint is displayed with an analog calculated value.

You can parameterize it in the program for heating or cooling.

For heating:

If T2 is below the setpoint, a binary calculated value "Request stage 1" is activated.
If T1 is below the setpoint, a second binary calculated value "Request stage 2" is activated.
If T4 is above the setpoint, both requests are deactivated.

For cooling:

If T3 is above the setpoint, a binary calculated value "Request stage 1" is activated.
If T4 is above the setpoint, a second binary calculated value “Request stage 2” is activated.
If T1 is below the setpoint, both requests are deactivated.

This program block has no optional functions.

Mandatory elements

Name	Description	Type	Alarm / Notification class	Trend / Type
T(1)	Temperature (1)	AI: Analog input	No	Yes, 4
T(2)	Temperature (2)	AI: Analog input	No	Yes, 4
T(3)	Temperature (3)	AI: Analog input	No	Yes, 4
T(4)	Temperature (4)	AI: Analog input	No	Yes, 4
PrSpT	Present temperature setpoint	ACalcVal: Analog calculated value	No	No
ReqSt1	Request stage 1	BCalcVal: Binary calculated value	No	No
ReqSt2	Request stage 2	BCalcVal: Binary calculated value	No	No

See also