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Next Steps

Writing a single coil

Here we have an example of writing a single coil to illuminate an LED, using the X20BC0087 ModBusTCP device from B&R.

<actions>
	<action action_id="Switch_LED_red" device_id="dev_X20BC0087">			# Here we define the name of the action and also which device is used to execute the command.
    	<commands>
      		<command command_id="ON">write_single_coil(12,[1])</command>	# Define the command ON and set the coil on the register 12 to 1.
        	<command command_id="OFF">write_single_coil(12,[0])</command>	# Same, although now we switch to OFF and set the coil to 0.
    	</commands>
    </action>
	.
	.
	.
</actions>

Fallback action

An action command is configurable with a fallback, which allows to trigger an action after the first one has been executed. Here is an example of a flapping state:

 	<action action_id="Blink" device_id="VirtualSensorProvider">
    	<commands>
        	<command command_id="ON" fallback_command_id="OFF" fallback_time_ms="1000">publish_calibrated_result('Blinker', True)</command>
    		<command command_id="OFF" fallback_command_id="ON" fallback_time_ms="1000">publish_calibrated_result('Blinker', False)</command>
  		</commands>
	</action>

Execute an action on startup

There are many scenarios where you might want to execute an specific action at startup. It can be easily configured adding exec_on_startup="true" to the command parameters.

<command command_id="Activate_theft_check" exec_on_startup="true">publish_calibrated_result('CheckBatteryTheft', True)</command>

Actions, executed by the VirtualSensorProvider

The VirtualSensorProvider allows the operator to create sensors, which do not have a physical device attached to them. This is especially usefull for setting "States of Alarm" to an system.

Here we will see a small example to set the value of the sensor to true or false.

<action action_id="Alarms" device_id="VirtualSensorProvider">							# Definition of the action and the obliogatory device id. It is important that the device id is the "VirtualSensorProvider".
	<commands>
    	<command command_id="Reset">publish_calibrated_result('Alarm',False)</command>
		command command_id="Set">publish_calibrated_result('Alarm', True)</command>
    </commands>
</action>

Actions, executed by an Automation Rule

An action can also be automatically be executed by an Automation Rule. These rules can be executed per example, if a special event is happening or specific values are reached.

More information about the Automation Rules can be found Automation Rule.

Next Steps