General Information - FB_HeatingControl2

TRUE: Enables function block and parameters are validated.

FALSE: Disables function block and all outputs are set to 0 or FALSE.

Temperature (in °C) to be maintained by the system.

Active in auto and auto-tuning mode.

Range: i_stTemperatureControl.rSetPointLowLimit ≤ i_rSetPoint ≤ i_stTemperatureControl.rSetPointHighLimit

Default value: 0.0 °C

Process temperature value [°C]

The process temperature value needs to be converted to the permissible value range in degrees Celsius outside the function block. If values outside the permissible value range are detected, the function block indicates that an error is detected, a diagnostic message is generated and the heating is switched off.

Active in auto and auto-tuning mode.

Range: -200…850

TRUE: Enables manual mode

FALSE: Disables manual mode

Only takes effect if q_etStatusAutoTune = ET_StatusAutoTune.Inactive.

Manual mode PID output [%]

Active in manual mode.

Range: i_stTemperatureControlr.PidLowLimit ≤ i_rManualValue ≤ i_stTemperatureControl.rPidHighLimit

Default value: 0.0 %

Enables auto-tuning with a rising edge from FALSE to TRUE.

A falling edge does not stop auto-tuning.

Default value: FALSE

TRUE: Stops the internal PID calculation and holds the output q_rAnalogOutput at the present value.

FALSE: Resumes the internal PID calculation.

Default value: FALSE

Only takes effect if q_etStatusAutoTune = ET_StatusAutoTune.Inactive AND i_xManualMode = FALSE.

Certain diagnostic messages can be reset using the input i_xReset. If a diagnostic message cannot be reset by a rising edge of i_xReset, verify and modify the parameter which causes the issue.

Active in all modes.

Includes various parameters needed for temperature control.

It is possible to select one of the 5 PID parameter sets to influence the PID controller behavior.

Each set includes different values for the PID parameters (rKp, rTn, rTv).

Structure providing various parameters for monitoring and controlling the heating system.

Indicates with TRUE that the program code is executing and that it must be executed in each cycle.

Indicates with TRUE that the POU is ready and can be controlled via its inputs according to its functionality.

After the function block has been activated via a rising edge of i_xEnable, the output q_xReady is only set to TRUE if the function block can process instructions from the inputs.

Indicates with TRUE that an error has been detected. For details, refer to q_etResult and q_etResultMsg.

Provides diagnostic and status information as an enumeration value.

Provides additional diagnostic and status information as a text message.

Analog form (signal) of the internal PID controller output or manual value (in manual mode).

Range: i_stTemperatureControl.rPidLowLimit ≤ q_rAnalogOutput ≤ i_stTemperatureControl.rPidHighLimit

PWM signal according to the output q_rAnalogOutput.

TRUE: Heating on

FALSE: Heating off

TRUE: Auto-tuning active

FALSE: Auto-tuning inactive

Status of auto-tuning as an enumeration value.

Default value: ET_StatusAutoTune.Inactive

Operation completed successfully.

i_rSetPoint < rSetPointLowLimit

or

i_rSetPoint > rSetPointHighLimit

For FB_HeatingControl:

rSetPointLowLimit < -100000 user temperature unit

or

For rSetPointLowLimit > rSetPointHighLimit

FB_HeatingControl2:

rSetPointLowLimit < -100 °C

or

rSetPointLowLimit > rSetPointHighLimit

For FB_HeatingControl:

rSetPointHighLimit > 100000 user temperature unit

or

For rSetPointHighLimit < rSetPointLowLimit

FB_HeatingControl2:

rSetPointHighLimit > 800 °C

or

rSetPointHighLimit < rSetPointLowLimit

Accepted control mode range: refer to ET_ParameterSetPID.

i_rManualValue < rPidLowLimit

or

i_rManualValue > rPidHighLimit

Calculated task cycle time must be greater than 0 and less than or equal to 10000 [ms].

One or more PID parameters are out of range

General issue from the internal PID controller

rPwmTimePeriod out of range

rPidLowLimit < 0

or

rPidLowLimit ≥rPidHighLimit

rPidHighLimit > 100

or

rPidHighLimit ≤rPidLowLimit

Invalid value for rDigitalFilterTime

The value for uiPwmCycleTimeToTaskRatio is out of range.

For FB_HeatingControl2:

The value for timShortCircuitMonitoring or the value for timNoHeatingPowerMonitoring is out of range.

For FB_HeatingControl2:

The value for rShortCircuitThreshold is out of range.

For FB_HeatingControl2:

The value for rShortCircuitSlopeLimit is out of range.

For FB_HeatingControl2:

The value for rNoHeatingPowerSlopeLimit is out of range.

For FB_HeatingControl2:

The process value is outside the valid range -200 °C… 850 °C.

Verify whether there is a cable break in the sensor or a short circuit.

For FB_HeatingControl2:

Heating of the system without active control.

Verify the heating control. For example, are the relay contacts opening?

For FB_HeatingControl2:

No temperature increases (slope) at maximum (rPidHighLimit) heating power.

Verify the function of the heating element or the heating control and its wiring.