FB: Coded Light Signal - v1.0

This function block encodes a numeric code value as a timed pulse train on output Q. The number of pulses equals the value of code.

Use Cases

• Encoding an alarm code as a light flash sequence on a single lamp output.
• Communicating a device state without requiring multiple output signals.

Dependencies

Type	Name	Version
function	TON_TIME	Siemens FB

Parameters

Function

Parameter	Declaration	Type	Init. value	Description
code	Input	UInt	—	IR: 0= No alarm; 1..65535= Alarm code to encode
opt_clearWhenNoAlarm	Input	Bool	1	IR: 1= Reset state machine when code returns to 0; 0= Let it finish the current cycle
startTime	Input	Time	T#3s	IR: Duration of the initial ON period before pulses
pulseTime	Input	Time	T#1s	IR: Duration of each individual pulse (ON and OFF)
endTime	Input	Time	T#2s	IR: Duration of the final OFF period after all pulses
Q	Output	Bool	—	OR: Coded output signal

Timing Diagram

code = 2

         Start: ON           Pulse: OFF     Pulse 1: ON    Pulse: OFF     Pulse 2: ON    End: OFF
        ___________________                ______________                ______________
Q => __|                   |______________|              |______________|              |__________________

        <    startTime    > < pulseTime >  < pulseTime >  < pulseTime >  < pulseTime > <   endTime   >