MC_AxRtCheckSyncDistance_BkPlcMc (from V3.0)
The function block checks for an invalid path (distance) after leaving the cam during homing.
Inputs
VAR_INPUT
MaxDistance: LREAL;
MinDistance: LREAL;
MaxIndexWidth: LREAL;
END_VAR
Name | Type | Description |
|---|---|---|
MaxDistance | LREAL | [mm] This parameter is used to specify the maximum permitted distance that may be traveled between the referencing cam and reaching of the zero pulse. |
MinDistance | LREAL | [mm] This parameter is used to specify the minimum distance that must be traveled between the referencing cam and reaching of the zero pulse. |
MaxIndexWidth | LREAL | [mm] This parameter is used to specify the minimum distance that must be traveled to leave the referencing cam. (from V3.0.20) |
Inputs/outputs
VAR_INOUT
Axis: Axis_Ref_BkPlcMc;
END_VAR
Name | Type | Description |
|---|---|---|
Axis | Axis_Ref_BkPlcMc | Here, the address of a variable of type Axis_Ref_BkPlcMc should be transferred. |
Outputs
VAR_OUTPUT
Active: BOOL;
Exceeded: BOOL;
END_VAR
Name | Type | Description |
|---|---|---|
Active | BOOL | Indicates that the axis has left the cam has and expects the zero pulse of the encoder. |
Exceeded | BOOL | Indicates that the axis has travelled more than MaxDistance after leaving the cam, without detection of the zero pulse of the encoder. |
Behavior of the function block
The function block detects the part of the homing, in which the axis searches for the zero pulse of encoder, thereby monitoring the distance travelled. Two problems can be detected during this process:
- The axis travels MaxIndexWidth, without that the falling edges of the referencing cam being detected.
- The axis travels MaxDistance, without a zero pulse being detected.
- The zero pulse is detected, before the axis has traveled MinDistance.
Any problems that are detected are indicated with Exceeded. If this is to lead to an axis error, the application must specify a corresponding change of state. An MC_AxRtGoErrorState_BkPlcMc function block and a coded Error Code should be used here.
 | Monitoring for MinDistance and MaxDistance can be suppressed by setting the respective parameter to 0.0. |