A35081 — TM54F: Static (steady state) 1 signal at the F-DI for safe acknowledgment

A35081 is a TM54F alarm that watches the failsafe digital input (F-DI) belonging to safe acknowledgment. It is raised when the F-DI configured in p10006 has been at a logical 1 signal for more than 10 seconds although no acknowledgment for safe acknowledgment was performed at that input. When no safe acknowledgment is taking place, the F-DI must sit at a steady logical 0 signal: the drive insists on this so that a safety-relevant acknowledgment — or the "Internal Event Acknowledge" signal — cannot be triggered unintentionally, for example if a wire breaks or one of the two digital inputs bounces. Depending on how the drive is configured, the same condition can also be output as fault F35081 instead of as this alarm.

• The F-DI configured in p10006 carries a logical 1 signal for more than 10 seconds.
• No acknowledgment was performed for safe acknowledgment at the F-DI, so a steady logical 0 signal is required there; the steady 1 would risk an unintentional safety-relevant acknowledgment (or the "Internal Event Acknowledge" signal) — exactly what this monitoring is there to prevent, e.g. when a wire breaks or one of the two digital inputs bounces.

1. Check whether a safe acknowledgment was actually performed at the F-DI configured in p10006. If none was performed, the input must be at a steady logical 0 — a logical 1 present for more than 10 seconds is precisely what the alarm reports.
2. Set the failsafe digital input (F-DI) to a logical 0 signal (p10006), so the input is back at the steady 0 the drive requires whenever no safe acknowledgment is being performed.

• p10006 — "SI Motion acknowledgment internal event F-DI (processor 1)": selects the failsafe digital input that triggers the internal event for safe acknowledgment. It is the input this alarm monitors, and the remedy is to bring the input configured here back to logical 0.

The condition is cleared by restoring the required signal state: bring the F-DI configured in p10006 back to a steady logical 0. As an alarm, A35081 requires no acknowledgment and goes once the input sits at logical 0 again. If the drive's configuration raises the same condition as fault F35081 instead, that fault causes no automatic drive reaction but must be acknowledged immediately once the F-DI has been returned to logical 0.