Set_AI_Mode

Overview

The Set_AI_Mode function block configures the operating mode of each channel of an AI module. Each channel can operate in:

Voltage mode (0-10 V) → 1
Current mode (4-20 mA) → 0

💡 AI Channels

Each AI module provides eight input channels.

Module_ID           :=  (USINT)
Ch0_Mode            :=  (BOOL)
Ch1_Mode            :=  (BOOL)
Ch2_Mode            :=  (BOOL)
Ch3_Mode            :=  (BOOL)
Ch4_Mode            :=  (BOOL)
Ch5_Mode            :=  (BOOL)
Ch6_Mode            :=  (BOOL)
Ch7_Mode            :=  (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.
Ch0_Mode	BOOL	0 / 1	Operating mode for channel 0: `1` = 0-10 V, `0` = 4-20 mA.
Ch1_Mode	BOOL	0 / 1	Operating mode for channel 1.
Ch2_Mode	BOOL	0 / 1	Operating mode for channel 2.
Ch3_Mode	BOOL	0 / 1	Operating mode for channel 3.
Ch4_Mode	BOOL	0 / 1	Operating mode for channel 4.
Ch5_Mode	BOOL	0 / 1	Operating mode for channel 5.
Ch6_Mode	BOOL	0 / 1	Operating mode for channel 6.
Ch7_Mode	BOOL	0 / 1	Operating mode for channel 7.

Outputs

Name	Type	Description
STS_Done	BOOL	`TRUE` when the AI mode configuration was successfully applied.
STS_Failed	BOOL	`TRUE` if the mode configuration operation failed.
STS_Fault_Code	USINT	Diagnostic code indicating the reason for failure.

Fault Codes

Code	Meaning	Description
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_Set_AI_MODE
    VAR
        AI_Mode_Block : Set_AI_Mode;
    END_VAR

    AI_Mode_Block(
        Module_ID := 4,
        Ch0_Mode := TRUE,       (* 0-10V *) 
        Ch1_Mode := TRUE,       (* 0-10V *)
        Ch2_Mode := FALSE,      (* 4-20mA *) 
        Ch3_Mode := FALSE,      (* 4-20mA *)
        Ch4_Mode := FALSE,      (* 4-20mA *)
        Ch5_Mode := FALSE,      (* 4-20mA *)
        Ch6_Mode := FALSE,      (* 4-20mA *)
        Ch7_Mode := FALSE       (* 4-20mA *)
        );
END_PROGRAM

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