●
The selection takes place via two channels, alternatively via
–
a passive safety unit with dual-channel, isolated conventional (non-
solid-state) normally closed contacts (e.g., safety switching device
for emergency stop, safety door monitor, etc.) or
–
an active safety unit with plus-switching OSSD outputs (e.g., safety
controls, laser scanners, etc.).
●
The dynamization of the safety function selection takes place
alternatively via
–
the OSSD dynamization of the active safety unit or
–
the "O_2" and "O_3" outputs at the XG31 terminal configured as
dynamization outputs, in the case of control via passive safety
units.
●
It is possible to set up a zone by connecting up to 25 drives in parallel.
●
Online dynamization of the outputs and interrupting circuits
●
Short reaction time (see "
Time response and reaction times
●
The state of safety function "Safe Torque Off" is displayed via a
parameter (P‑0‑0106).
●
With the safety function "Safe Torque Off" activated, the diagnostic LED
at the drive outputs the flashing pattern "blue - yellow- yellow", and the
optional display of the control panel shows "STO".
Safety function
The optional safety technology module "T0" features two 24 V inputs for dual-
channel selection. For operation at passive safety units, two dynamization
outputs are available at the standard outputs of the drive.
For pin assignments and technical data, please refer to the
chapter
.
The safety function "Safe Torque Off" includes the following topics that are
described in detail below:
●
Dynamization
●
Requirements on the command value input
●
Selecting the safety function "Safe Torque Off"
Dynamization
Dynamization is to detect static error states in the wiring and in the safety-
relevant circuits. Dynamization takes place automatically in the background
without having an effect on the safety function or the standard drive functions.
A safety function is selected via an N/C‑N/C combination, i.e. a "0"-signal at
both inputs is evaluated as the selection of the safety function. Therefore, the
dynamization of the external selection channels can only take place in the
deselected state (normal operation). The dynamization of the safety function
selection is also used for internal dynamization.
For the dynamization of the safety function selection, we distinguish whether
the safety function is selected via an active or a passive safety unit. The
dynamization function is explained in the chapter on "
The dynamization pulses are monitored for the following aspects:
●
Time interval
●
Pulse width
●
Sampling ratio
28/65
Integrated safety function
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE
Bosch Rexroth AG R911383774_Edition 03
