Sequence

Function

This statement creates a sequence from one to three analog outputs depending on an analog input. The Sequence statement divides a control signal into up to three output signals.

Parameters Configuration Dialog

Fig. 242.   Parameters configuration dialog


Use the following procedure to create characteristic curves for each desired output “Out Y1” through “Out Y3”. For creating a characteristic for


Creating a Sequence
  1. Enter the values for sequence.
  2. Click OK to confirm your entries.


Reverse Acting Application Example

A PIDPlus output can be an input to a Sequence statement that controls three functions (heating, energy recovery and cooling):

Fig. 243.   Reverse acting application example

The output of the PIDPlus controller will be in a range of 100% to 0% when the measured value changes are in a Range of 18 to 22 °C when the P-band of eth PID controller is set to 4 K.


Fig. 244.   Reverse acting application sequences


Set the parameters is as show in the next picture.

Fig. 245.   Reverse acting application parameter setting

Direct Acting Example

This example uses switches the connection of the setpoint and measured value to make it direct acting:

Fig. 246.   Direct acting application example

The output of the PIDPlus controller will be in a range of 0% to 100% when the measured value changes are in a Range of 18 to 22 °C when the P-band of eth PID controller is set to 4 K.

:


Fig. 247.   Direct acting application sequences


Set the parameters is as show in the next picture.


Fig. 248.   Direct acting application parameter setting

Using a Sequence for a compensated setpoint

This example shows a heating control loop with a setpoint with winter compensation.

This setpoint with outside air temperature reset is shown in the next picture:

Fig. 249.   Compensated setpoint sequences


The control loop example using the CARE dHAVC palette is shown in the next picture:

Fig. 250.   Compensated setpoint application example


Set the parameters is as show in the next picture.


Fig. 251.   Compensated setpoint parameter setting


Negative Values

Use the Ramp function to generate negative values.



Fig. 252.   Wire-sheet Icon

Fig. 253.   Property Sheet

Fig. 254.   Slot Sheet

Inputs and Outputs

Table 148.   Inputs

Inputs

Type

Functional description

In Seq

numeric

Input value

In Enabled

boolean

If the input “In Enabled” is set to false disabled in the slot sheet, the output “Out” will be disabled and is set to the value “0”.


Table 149.   Outputs

Outputs

Type

Functional description

Out Y1

numeric

Sequence Y1 output (heating)

Out Y2

numeric

Sequence Y2 output (mixing dampers; energy recovery)

Out Y3

numeric

Sequence Y1 output (cooling)


Parameter List

Table 150.   Parameter List

Description

Value Range

Default Value

Unit

P1 Xmax

-...

100

-

P2 Xa1

X value a1 of sequence Y1

-...

0

-

P3 Ya1

Y value a1 of sequence Y1

-...

0

-

P4 Xb1

X value b1 of sequence Y1

-...

100

-

P5 Yb1

Y value b1 of sequence Y1

-...

100

-

P6 Xa2

X value a2 of sequence Y2

-...

0

-

P7 Ya2

Y value a2 of sequence Y2

-...

0

-

P8 Xb2

X value b2 of sequence Y2

-...

100

-

P9 Yb2

Y value b2 of sequence Y2

-...

100

-

P10 Xa3

X value a3 of sequence Y3

-...

0

-

P11 Ya3

Y value a3 of sequence Y3

-...

0

-

P12 Xb3

X value b3 of sequence Y3

-...

100

-

P13 Yb3

Y value b3 of sequence Y3

-...

100

-