item Controller BL 1-04 /C
― Product manual
20
4.5.2 Overview of the [X3] interface
Figure 5: Position of connector X3
At its front, the servo drive has an 8-pin connector [X3] for
▪ the STO control inputs,
▪ the digital output DOUT0, and
▪ the digital inputs DIN 6 and DIN
The STO safety function is requested exclusively via the two digital control inputs STOA and STOB. The safety-oriented integra
-
tion of additional interfaces is not necessary/intended.
The servo drive does not monitor the input circuit for cross-circuit faults.
The [X3] interface enables the direct connection of active and passive sensors as DOUT0/GND provide a short-circuit-proof 24
V supply voltage (see section 9.12 Connector: STO [X3] on page 70).
4.5.3 Control inputs STOA, GNDA/STOB, GNDB [X3]
The control inputs STOA and STOB are used for requesting the STO safety function ("Safe Torque Off") via two channels. They
enable the direct connection of safe semiconductor outputs (electronic safety relays, active safety sensors, e.g. light grid with
OSSD signals) and of switching contacts (safety relays with relay outputs, passive safety sensors, e.g. positively driven position
switches). See, for example, section 9.12 Connector: STO [X3] on page 70.
To request the STO safety function ("Safe Torque Off"), the 24 V control voltage is switched off at both control inputs STOA and
STOB (0 V). If both control inputs are switched off simultaneously or within a predefined discrepancy time, the STO function
becomes active.
The table in section 8.11.1 Electrical data of the STO function on page 47 includes the technical data of the control inputs for
the specified operating range of logic voltages.
Certain tolerance ranges have been defined for the input voltage range of the control inputs STOA and STOB. The amount of
energy that is stored in the components of the STO circuit (e.g. capacitors) depends on this input voltage. During switching
processes, this energy must be charged or discharged. This results in specific values for the switch-off time for the transition
