Passive Stop
It is the stop that occurs on a wireless remote control as a result of the transmitter's broadcast being interrupted: the battery runs flat, the device is switched off, or the operator goes out of range. Because no command is being sent, the receiver outputs drop and the movement ends. No deliberate action by the operator is required; the stop arises from the absence of a signal.
In a passive stop, what decides to stop is not a button but the silence of the communication. If the receiver does not get a valid frame for a certain time it releases its outputs; the contactor coils drop out and the machine stops.
- Typical triggers: battery going flat, the transmitter being switched off, the device being dropped, going out of range, excessive interference.
- Its limit: the stop applies only to the outputs controlled by the receiver; the machine's other energy sources are not affected.
- Timing: the response time depends on the communication monitoring time declared by the manufacturer.
A passive stop is the natural result of a safe design but it is not an emergency stop device; a fixed and hard-wired emergency stop circuit in the sense of ISO 13850 is still expected. Because the stopping time is not stated in the product data of the AXI ST and SF sets, do not assume a numerical value; confirm it from the user manual and test it with no load during commissioning.
The context in which this term is used: Wireless remote control installation: pairing, relays, safety