FB: Monitor Physical Pulse Button (2 Outputs) - v1.0

This function block monitors a physical pulse button and generates two independent pulse outputs based on how long the button is held. A watchdog monitors for stuck-button conditions.

Use Cases

• Short press = one action (e.g., step forward); long press = another action (e.g., jog continuous).
• Mode selection via button hold duration.

Dependencies

Type	Name	Version
function	TP_TIME	Siemens FB
function	TON_TIME	Siemens FB

Parameters

Function

Parameter	Declaration	Type	Init. value	Description
button	Input	Bool	—	IW: 1= Button is pressed
ACTION_1_TIME	Input	Time	T#2s	IR: Upper time limit for Q1. Must be less than ACTION_2_TIME
ACTION_2_TIME	Input	Time	T#5s	IR: Lower time limit for Q2. Must be less than WATCHDOG_TIME
WATCHDOG_TIME	Input Retain	Time	T#10s	IR: Watchdog time. 0= Disabled; >0= Maximum allowed press duration
PULSE_TIME	Input Retain	Time	T#500ms	IR: Output pulse duration
Q1	Output	Bool	—	OR: Pulse on release — button held between 0s and ACTION_1_TIME
Q2	Output	Bool	—	OR: Pulse on release — button held between ACTION_2_TIME and WATCHDOG_TIME
ET	Output	Time	—	OR: Elapsed time while button is pressed
a2w_1_watchdog	Output	Bool	—	OR: 1= Alarm warning — button held longer than WATCHDOG_TIME

Output Logic

Output	Condition
Q1	Button released with ET > 0s and ET < ACTION_1_TIME
Q2	Button released with ET > ACTION_2_TIME and ET < WATCHDOG_TIME
a2w_1_watchdog	Button held longer than WATCHDOG_TIME