MCV_GrpSingleBlock
This FB activates single step mode while NC blocks are processed.
Block diagram

FB parameters
| VAR_IN_OUT | ||
| Variable name | Data type | Description | 
| AxesGroup | AXES_GROUP_REF | Axis group reference | 
| VAR_INPUT | ||
| Variable name | Data type | Description | 
| Enable | BOOL | A command can be sent via the “Cmd” input as long as the input is TRUE. | 
| Cmd | BOOL | Single step mode is active when NC blocks are processed as long as TRUE is applied to the input. | 
| VAR_OUTPUT | ||
| Variable name | Data type | Description | 
| Req | BOOL | Indicates that another user commanded single step mode, e.g. a GUI. This command only becomes active when it is applied to the “Enable” input of the FB. | 
| State | BOOL | TRUE indicates that the single step function is activated. | 
| Error | BOOL | Indicates TRUE when an error occurs. | 
| ErrorID | UDINT | Error identifier |