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System design and function
PMC SR6 – Design
The PMC SR6 safety module is designed with two channels. Both safety channels are independent of
one another and must be activated at the corresponding STO
channel 2) inputs at the same time, either directly via floating contacts with 24 V
24 V
semiconductor outputs with layered testing.
DC
Using both the STO
enabled or disabled.
Monitoring the connection wiring
Status signals are provided for checking the status of the connecting wiring and the function of the
safety channels:
}
Using the STO
STO
output is always 1 (high level) if the STO
(low level). The signal is output on the X12 terminal of the drive controller.
}
Using parameter E67
Parameter E67 is an array parameter that visualizes the state of both safety channels in detail.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
WARNING!
Increased overrun distance! Residual motion!
The safety module cannot prevent a failure of the functional part of the drive
controller (e.g. during a controlled stop) while the SS1-t safety function is executed.
Therefore, SS1-t cannot be used if this failure could cause a dangerous situation in
the end application. Observe this during project configuration.
In the event of an error in the power unit of the drive controller, static energization of
the motor is possible despite active STO. In this case, the motor shaft can move by
an angle of up to 360° ÷ (p × 2).
and STO
inputs, rotating magnetic field generation in the drive controller is
a
b
signal via terminal X12
status
is the result of a NOR gate of the two STO
status
Information
If both STO inputs are controlled via outputs with test pulses, e.g. interface type C or
D, the monitoring of the connecting wiring is taken over by the signal-generating
controller. Potential faults are detected directly, eliminating the need to evaluate the
STO status signals.
(safety channel 1) and STO
a
and STO
inputs, meaning that the STO
a
b
input equals 0 (low level) and the STO
a
(safety
b
or alternately via
DC
status
input equals 0
b
Pilz | 12
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