Stg123Outp Function Block

The Stg123 Output function block is used to calculate the number of stages to be switched on based on 0 - 100 % input control signal. It supports up to a maximum of 3 stages. The function block also drives the individual binary outputs based on property configuration in a serial or parallel fashion.

Figure 1: Stg123Outp - Function Block

Figure 2: Stg123Outp - Property Sheet


Stg123Outp: 1-Stage (1BO)

Figure 3: Stg123Outp 1-Stage (1BO)


Stg123Outp: 2-Stage (2BO Parallel)

Figure 4: Stg123Outp 2-Stage (2BO Parallel)


Stg123Outp: 2-Stage (2BO Serial)

Figure 5: Stg123Outp 2-Stage (2BO Serial)


Stg123Outp: 3-Stage (2BO Parallel)

Figure 6: Stg123Outp 3-Stage (2BO Parallel)


Stg123Outp: 3-Stage (3BO Parallel)

Figure 7: Stg123Outp 3-Stage (3BO Parallel)


Stg123Outp: 3-Stage 3BO Serial

Figure 8: Stg123Outp 3-Stage (3BO Serial)


Stg123Outp: MinOnOffTime

Figure 9: Stg123Outp MinOnOffTime

Input

Input Name

Description

Enable

Function block enable

Disable =0, Enable =1

In

Input control signal 0-100 %.

Enable Timer

Enables Stage, On/Off times. If disabled, a running timer is stopped immediately.

Disable =0, Enable =1

Manual

The input is used for manual override of the "In" input of the PID controller (automatic). Under certain conditions (Frost Protection Switch) a certain position can be applied to the actuator. Manual has higher priority than the Input "In".

Interlock

It is used where output opens only if a fan is running or an airflow contact detects flow. The output remains closed until Interlock is true. Even if Manual Override > 0%, the output keeps closed until Interlock is "true".

Self Test Cycle

It is a time after the output toggles between 0% and 100%. Whenever the time has elapsed, the output toggles. 0 or "null" disables the self test.

Min Off Time

(In & Par)

It starts when any lower stage is switched or to OFF. If the Min Off Time is running, no other stage can be switched.

Min On Time

(In & Par)

It starts when any higher stage is switched. If the Min On Time is running, no other stage can be switched.

Table 1:Inputs of Stg123Outp Function

Output

Output Name

Description

Out Virtual Position

The value indicates the current stage as a percentage value. The possible values depend on the number of configured stages.

Out Stage

The value indicates the current stage.

Out1

This output must be connected to the physical output like a relay or a triac.

Out2

This output must be connected to the physical output like a relay or a triac.

Out3

This output must be connected to the physical output like a relay or a triac.

Out Self Test Running

The output is "true", if the self-test is running.

Self test not running =0, Self test running =1

Out Cause

The output serves to understand what the function block is currently doing.

Disabled = 16, Manual = 32, Interlock false = 64, Self Test active = 128, Min Off Timer running = 512, Min On Timer running = 1024, OperationIsOff = 2048

Table 2:Outputs of Stg123Outp Function

Parameter

Parameter Name

Description

Operation

There are four operations as follows:

  • OneStageOneOutput
  • TwoStagesTwoOutputs
  • TwoStagesThreeOutputs
  • ThreeStagesThreeOutputs

This is used to define the number of stages and the number of outputs used. For a 3-stage fan 3 outputs are necessary, for a 3-stage reheater 2 outputs are also sufficient (e.g. output 1 with 500W, output 2 with 1000W, together this results in stage with 1500W). The output can be deactivated via Off, e.g. if the output has not yet been installed during commissioning to avoid shortcut from the unconnected cables.

During Off the output switch immediately OFF, OutVirtualPos =0, OutStage =0, Self test cannot be started, the Staging Model is not executed any longer.

Mode

There are two modes:

  • OneOutputAtATime
  • SeveralOutputAtATime

This can be used to set whether only 1 individual output is to be switched on at a time or whether the outputs are to be switched on in parallel, i.e. several at the same time. The answer depends on the wiring.

Stage1 Off

Type the Stage1 Off value in percentage. An input value below this values switches to OFF.

Stage1 On

Type the Stage1 On value in percentage. An input value above this values switches to Stage1.

Stage2 Off

Type the Stage2 Off value in percentage. An input value below this values switches to Stage1.

Stage2 On

Type the Stage2 On value in percentage. An input value above this values switches to Stage2.

Stage3 Off

Type the Stage3 Off value in percentage. An input value below this values switches to Stage2.

Stage3 On

Type the Stage3 On value in percentage. An input value above this values switches to Stage3.

Min Off Time Par

(In & Par)

Type the Min Off Time in seconds. It starts when any lower stage is switched or to OFF. If Min Off Time is running, no other stage can be switched.

Min On Time Par

(In & Par)

Type the Min On Time in seconds. It starts when higher stage is switched. If Min On Time is running, no other stage can be switched.

Out Save

Master Sync Enabled : If you set it to "true" the last output will be set as output for one cycle after the controller restarts. The application can use it to return to the same state before the controller restart.

Out Virtual Pos: To enable or disable the Out Virtual Pos feature.

Out Stage:To enable or disable the Out Stage feature.

Out 1:To enable or disable the Out 1 feature.

Out 2:To enable or disable the Out 2 feature.

Out 3:To enable or disable the Out 3 feature.

Out Self Test Running:To enable or disable the Out Self Test Running feature.

Out Cause:To enable or disable the Out Cause feature.

Table 3:Parameters of Stg123Outp Function

Examples

The below diagram explains the stage output behavior.

1.       Stage 1 On = 10%

2.       Stage 1 Off = 0%

3.       Stage 2 On = 50%

4.       Stage 2 Off = 10%

5.       Stage 3 On = 75%

6.       Stage 3 Off = 50%

Figure 10: Stage output behavior.

Figure 11: Stg123 Out function block and property sheet.

Refer to General Description for general information about IRM N4 Function Blocks.