MC_Power
This function block controls the power stage (on or off).
Syntax
Definition:
FUNCTION_BLOCK MC_Power
VAR_IN_OUT
Axis : Reference To AXIS_REF;
END_VAR
VAR_INPUT
Enable : BOOL;
EnablePositive : BOOL;
EnableNegative : BOOL;
END_VAR
VAR_OUTPUT
Status : BOOL;
Error : BOOL;
ErrorId : UDINT;
END_VAR
Inputs
|
Name |
Type |
Default |
Description |
|---|---|---|---|
|
Enable |
BOOL |
|
General software enable for the axis |
|
EnablePositive |
BOOL |
false |
Feed enable in positive direction. Only effective if Enable = TRUE |
|
EnableNegative |
BOOL |
false |
Feed enable in negative direction. Only effective if Enable = TRUE |
Outputs
|
Name |
Type |
Description |
|---|---|---|
|
Status |
BOOL |
Axis is ready for motion commands. |
|
Error |
BOOL |
Error occurred within function block or axis already signaling an error. |
|
ErrorId |
UDINT |
Error identifier of function block or axis |
Further information
The MC_Power function block is used to enable an axis in the software. The enable can be applied to both directions or only to a specific direction. A TRUE at the Status output indicates that the axis is ready for operation.
Depending on the drive type, Status also indicates that the drive is ready for operation. Digital drives provide feedback on operational readiness, while analog drives are unable to indicate their operational readiness. In the latter case Status only indicated operational readiness of the control side.
 | Hardware enable signal In addition to software enable it may be necessary to activate a hardware enable signal in order to enable a drive. This signal is not influenced by MC_Power and must be activated separately by the PLC. |
Effects on the axis state
MC_Power.Enable affects the axis state as follows:
Note on the migration from NC2 to MC3
For MC3 axes, the override is set to 100% by default. The MC_SetOverride function block is available for setting the override.
Possible error codes
For this function block, the following values, among others, are possible for the ErrorId output:
Error(Hex) | Error(Dec) | Error type | Description |
|---|---|---|---|
0x8145 | 33093 | Function Block | Mapping of cyclic interface between NC and PLC is missing (e.g., AXIS_REF, AXES_GROUP_REF, ...). A reference used by the function block (e.g., to an axis, group, mover or other motion object) is not linked to the corresponding NC object, or its cyclic mapping is incomplete. |
0x8151 | 33105 | State | Command is not allowed in current axis state. If the axis has no controller enable, is in error or has been added to a group, some commands are not permitted. |
0x819d | 33181 | NC Programming | The Motion UI has sovereignty for the controller enable. The PLC has handed over the controller enable and feed enable to the Motion UI. |
0x81a2 | 33186 | Environment | I/O data for more than n consecutive MC cycles invalid. Hardware process data was invalid for several consecutive MC cycles (e.g. EtherCAT slave not in OP, WcState error). |
An overview of all NC error codes can be found here:
Version information
- TwinCAT Standard >= v3.1.4026.23.1
- TF5500 MC3 Base >= v4.0.6