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More on safety technology and PMC SR6?
Explanation
The drive function is controlled by the PLC K2. It transmits target values to drive controller T1,
switches both STO
PLC is not involved in the safety function.
The danger point is protected by a movable, isolating safety door. The two position switches B1 and
B2 detect when the protective device is opened, which is then also analyzed by the safety relay K1.
The STO inputs are switched off after a defined delay time has passed, independent of the PLC, via
the switch-off delayed enable paths of the safety relay K1. Either the drive controller or PLC can be
brought to a stop safely during this delayed STO switch-off of the drive. If the drive controller triggers
the stopping, as in this example, there is the option of activating and parameterizing the function
quick stop during
The safety relay K1 detects any potential errors in the position switches by using a plausibility
comparison. K1 is equipped with the suitable self-monitoring functions that open the enable paths in
the event that errors are detected.
A malfunction of the PMC SR6 safety module triggers the STO safety function and prevents the drive
from restarting in the event of an error.
Faulty STO connection wiring of K1, K2 and T1 can, if needed, be detected by the PLC K2 through a
plausibility comparison. In this case, the drive controller T1 transmits a corresponding STO status
message to the PLC K2. This becomes part of the safety circuit.
11.3.2.2
Creating block diagrams
Block diagrams focus on the connections between design and logic for the components of the
accompanying schematic diagram.
Fig. 13: Safety-related block diagram
B1, B2
K1
T1
Manual PMC SR6 safety module
1005344-en-US-01
Intern
and STO
inputs and can start and stop the drive using an enable signal. The
a
b
enable-off.
Position switches
Safety relay (encapsulated subsystem)
Drive controller with integrated PMC SR6 safety module (encapsulated
subsystem)
Pilz | 35
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