Introduction
The OMRON FB library for position controllers provides a collection of function blocks developed for simple open loop axis positioning.
Most of the FBs share the same interface (I/O) regardless of the output device employed for positioning (CJ1M, CPUs, CP1H or NC Units).
All the FBs rely on the functionalities built-in the CPUs and the NC units.
None of the functions employ the feedback from an encoder for positioning.
Function Description
- When Start (Execute) is turned ON, executes origin search for the output specified with Axis No. (Axis), based on the PLC Setup Settings in the CPU Unit (using the selected Pulse output method).
- After the origin search is completed, Present Position Change will be executed (the value specified in Position data (Position) will become the present position). Even when 0 is specified in Position data (Position), Present Position Change will be executed.
- The Origin search completed (Done) will be turned ON when Present Position Change by this FB is completed. When an origin search is interrupted by a deceleration stop or error, the Origin search completed (Done) will not be turned ON.
- The Error flag (Error) and Error code (ErrorID) will be output when an error related to this FB occurs. They will be turned OFF when Start (Execute) is turned OFF.
- If Start (Execute) is turned OFF before origin search is completed, they will be turned ON at least for one cycle when a corresponding condition occurs.
Example
| Basic function | Executes origin search to define an origin |
| Symbol |  |
| File name | Lib\FBLomronlib\PositionController\NC-CPU(CJ1MCPU2x)\_NCCPU051_Home_DINT10.cxf |
| Applicable models | CPU Unit CJ1M-CPU21/22/23 Unit Version 3.0 or higher |
| CX-Programmer Version 5.0 or higher |
Variable Table
Input Variables
| Name | Variable Name | Data type | Default | Range | Description |
| EN | EN | BOOL |
1(ON): Starts FB 0(OFF): Does not start FB |
||
| Axis No. | Axis | INT | &0 | &0to&1 |
&0: PulseOutput 0 &1: PulseOutput 1 |
| Start | Execute | BOOL | 0(OFF) | Starts origin search | |
| Position data | Position | DINT | +0 | -2,147,483,648 to +2,147,483,648 | Specifies the position data to be used in the Present Position Change (Unit: Pulses) |
| Pulse method output | OutputPulseSelect | INT | &0 | &0 to &1 |
&O: CW/CCW Output &1: Pulse + direction output |
Output Variables
| Name | Variable Name | Data type | Range | Description |
| ENO | ENO | BOOL |
1(ON): FB operating normally 0(OFF): FB not operating normally |
|
| Origin search completed | Done | BOOL | 1(ON) indicates that an origin search has been completed | |
| Error flag | Error | BOOL | 1(ON) indicates that an error has occurred in the FB | |
| Error code (may be omitted) | Error ID | WORD | The error code of the error in the FB will be output.For details of the errors refer to the sections of the manuals listed in the manuals mentioned above. When Unit No. or Axis No. is out of the range 0000 will be output. |
