.. _set_output_register_bit:

set_output_register_bit
------------------------------------------
This function writes a **single bit** to the controller **output register**  
using the specified **register address** and **bit value**.
It is typically used for PLC I/O register control in Ethernet-based environments.

**Definition** |br|
``DRFLEx.h`` within class `CDRFLEx`, public section

.. code-block:: cpp

   bool set_output_register_bit(unsigned short address, int val) {
       return _set_output_register_bit(_rbtCtrl, address, val);
   };

**Parameter**

.. list-table::
   :widths: 20 20 20 55
   :header-rows: 1

   * - **Parameter Name**
     - **Data Type**
     - **Default Value**
     - **Description**
   * - address
     - unsigned short
     - -
     - Output register address (bit type, 0~63)
   * - val
     - int
     - -
     - **Bit value** to write |br|
       `0` : OFF |br|
       `1` : ON

**Return**

.. list-table::
   :widths: 25 75
   :header-rows: 1

   * - **Value**
     - **Description**
   * - 0
     - Error: failed to write output register bit
   * - 1
     - Success: output register bit written

**Example**

.. code-block:: cpp

   #include "DRFLEx.h"
   #include <iostream>

   using namespace DRAFramework;

   int main() {
       CDRFLEx robot;

       const char* ip = "192.168.137.100";
       if (!robot.open_connection(ip)) {
           std::cout << "Failed to connect: " << ip << std::endl;
           return 1;
       }

       // Write bit and read back (timeout 300 ms)
       // Initialize to -1 to indicate “not read yet” if the call fails.
       int out_bit = -1;
       robot.set_output_register_bit(0, 1);
       robot.get_output_register_bit(0, out_bit, 300);
       std::cout << "addr=0, out_bit=" << out_bit << std::endl;

       robot.close_connection();
       return 0;
   }

This example sets the output register bit at **address 0 (Bit_Output_Register[0])** to ON and reads it back.