Calib_Step1_ClearParameters

Overview

The Calib_Step1_ClearParameters function block performs the first step of the AI module calibration procedure. This step clears the currently loaded calibration parameters for the individually selected mode of a specific channel, ensuring that subsequent calibration steps are performed with clean and accurate baseline data.

💡 Step Sequence

After clearing parameters in this first step, the second step needs to be executed, in order to calculate and store the new set of calibration parameters.

Module_ID               :=  (USINT)
Channel_Number          :=  (USINT)
Channel_Mode            :=  (BOOL)
CMD_Clear_Parameters    :=  (BOOL)
STS_Done                =>  (BOOL)
STS_Failed              =>  (BOOL)
STS_Fault_Code          =>  (USINT)

Interface

Inputs

Name	Type	Range / Units	Description
Module_ID	USINT	1 - 15	Unique identifier of the AI module.
Channel_Number	USINT	0 - 3	Specifies which AI channel to clear.
Channel_Mode	BOOL	0 / 1	Channel mode for which the clearing is done: `1` = 0-10 V, `0` = 4-20 mA.
CMD_Clear_Parameters	BOOL	TRUE / FALSE	Clears parameters on a rising edge (input goes from `FALSE` to `TRUE`).

Outputs

Name	Type	Description
STS_Done	BOOL	`TRUE` if the calibration parameters have been successfully cleared.
STS_Failed	BOOL	`TRUE` if the operation failed to clear the parameters.
STS_Fault_Code	USINT	Diagnostic code indicating the reason for failure.

Fault Codes

Code	Meaning	Description
91	Step1 Clear Failed	Clearing of calibration parameters failed.
97	Module Faulted	The AI module reported an internal fault.
98	Module Mismatch	The detected module type does not match the expected AI module.
99	Module Not Found	The specified `Module_ID` is not part of the current hardware configuration.

Example

PROGRAM PROG_AI_Calib_Step1_ClearParameters
    VAR
        AI_Calib_Step1 : Calib_Step1_ClearParameters;
        Trigger_Tag    : BOOL := FALSE;  (* Internal toggling trigger *) 
    END_VAR

    AI_Calib_Step1(
        Module_ID := 4,
        Channel_Number := 0,       (* Channel 0 *)
        Channel_Mode := 0,         (* 4-20mA mode *)
        CMD_Clear_Parameters := Trigger_Tag
    );
END_PROGRAM

CONFIGURATION Config0
    RESOURCE Res0 ON PLC
        TASK task1_20ms(INTERVAL := T#20ms, PRIORITY := 1);
        PROGRAM Prog_Instance WITH task1_20ms : PROG_AI_Calib_Step1_ClearParameters;
    END_RESOURCE
END_CONFIGURATION