Safety Functions Of Pm330; Technical Fundamentals Of Pm330 Power Module; General Fundamentals And Data - Siemens PM330 Hardware Installation Manual

Safety functions of PM330

8.1

Technical fundamentals of PM330 Power Module

8.1.1

General fundamentals and data

PM330 Power Modules are equipped with the safety subfunction Safe Torque Off (STO)
from function release (FS) 04. An additional license is not required for this function; a speed
encoder is also not necessary.
The STO circuit can be deactivated using the two switches -S41 STO_A and STO_B; for
plants and systems where an STO function is not required, or for situations where this would
represent a disturbance.
As described in Chapter "Schematic diagram of the safety relay at X41 (Page 54)", the
complete STO function is subdivided into safety subfunctions.
React
The safety subfunction of the PM330 is controlled via terminal block X41 using digital inputs
STO_A and STO_B. A low signal at the inputs (STO activated) interrupts the two redundant
switch-off signal paths of the PM330 - the torque or force-generating energy fed to the drive.
To diagnose these two switch-off signal paths, the two feedback signal contacts FB_A and
FB_B are made available at terminal strip X41 to the higher-level "Evaluate" safety
subfunction.
These feedback signal contacts of the PM330 may only be used at digital inputs or in
feedback circuits to diagnose the switch-off signal paths.
Evaluate
The "Evaluate" safety subfunction is realized using an application connected at terminal strip
X41 of the PM330. This must handle the evaluation of the sensors ("Detect"), control the
actuator of the PM330 ("React") - as well as the diagnostics of the safety subfunction
("React").
Detect
This document does not go into any more detail about the "Detect" safety subfunction. Refer
to the appropriate manual "3SK1 safety relays ".
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
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