Programming the Standard Encoder

Overview

A Standard Encoder is always managed by an Encoder_LMC058 function block.

Adding a Standard Encoder Function Block

Step	Action
1	Select the Libraries tab in the Software Catalog and click Libraries. Select Controller > LMC058 > LMC058 Expert IO > ENCODER > ENCODER_LMC058 in the list, drag-and-drop the item onto the POU window.
2	Type the Encoder_LMC058 instance name or select the function block instance by clicking: Using the input assistant, the Encoder_LMC058 instance can be selected at the following path: Global Variables > PLC Logic > IoConfig_Globals.

Step

Action

Select the Libraries tab in the Software Catalog and click Libraries.

Select Controller > LMC058 > LMC058 Expert IO > ENCODER > ENCODER_LMC058 in the list, drag-and-drop the item onto the POU window.

Type the Encoder_LMC058 instance name or select the function block instance by clicking:

Using the input assistant, the Encoder_LMC058 instance can be selected at the following path: Global Variables > PLC Logic > IoConfig_Globals.

I/O Variables Usage

The following table describes the input variables:

Inputs	Type	Comment
EN_Enable	BOOL	Not used.
EN_Preset	BOOL	Not used.
EN_Cap	BOOL	When at least one CAP input is configured, it authorizes the capture function via the inputs.
EN_Compare	BOOL	TRUE = enables the comparator operation using Thresholds 0, 1, 2, 3: obasic comparison (TH0, TH1, TH2, TH3 output bits) oreflex (Reflex0, Reflex1 output bits) oevents (to trigger external tasks on threshold crossing)
EN_Out0	BOOL	Not used.
EN_Out1	BOOL	Not used.
F_Enable	BOOL	Forces the Enable condition. In case of a detected SSI error, setting the F_Enable input to 0 acknowledges this detected error.
F_Preset	BOOL	Forces the Preset condition.
F_Out0	BOOL	Not used.
F_Out1	BOOL	Not used.
ACK_Overflow	BOOL	On rising edge, resets Overflow_Flag
ACK_Preset	BOOL	On rising edge, resets Preset_Flag.
ACK_Cap0	BOOL	On rising edge, resets Cap0_Flag.
ACK_Cap1	BOOL	On rising edge, resets Cap1_Flag.
SuspendCompare	BOOL	Not used.

The following table describes the output variables:

Outputs	Type	Comment
ENC_REF	EXPERT_REF	Reference to the Standard Encoder. To be used with the EXPERT_REF_IN input of Administrative Function block.
Encoder_Err	BOOL	TRUE = indicates that an error was detected. Use the EXPERTGetDiag function block to get more information about this detected error.
Validity	BOOL	TRUE = indicates that the output values on the function block are valid. TRUE after the first preset.
TH0	BOOL	Set to 1 when CurrentValue > Threshold 0 (if configured).
TH1	BOOL	Set to 1 when CurrentValue > Threshold 1 (if configured).
TH2	BOOL	Set to 1 when CurrentValue > Threshold 2 (if configured).
TH3	BOOL	Set to 1 when CurrentValue > Threshold 3 (if configured).
Overflow_Flag	BOOL	Set to 1 when the encoder rolls over its limits.
Preset_Flag	BOOL	Set to 1 after the encoder presets.
Cap0_Flag	BOOL	Set to 1 when a new capture value is stored in the Capture register. This flag must be reset before a new capture is allowed.
Cap1_Flag	BOOL	Set to 1 when a new capture value is stored in the Capture register. This flag must be reset before a new capture is allowed.
Reflex0	BOOL	State of Reflex0.
Reflex1	BOOL	State of Reflex1.
Out0	BOOL	Not relevant
Out1	BOOL	Not relevant
Low_Limit	BOOL	Not relevant
High_Limit	BOOL	Not relevant
EncoderValue	DINT	Current value of the encoder. The value is not valid if an error is detected.