TWK
Safety for AGVs
TWK presents the TxSN sensor model with magnetic sensor system in the series of functionally safe sensors with the CANopen Safety interface standard (EN 50325-5).
The sensor model comprises the TRSN multiturn rotary encoder and its small TBSN singleturn brother. It will fulfill SIL3 according to EN ISO 61508, it is also ASIL-D-compliant according to ISO 26262 and is suitable for the control elements of the remote control station of AGVs (Automated Guided Vehicles) for recording control commands, among other things. According to TWK, the fully redundant design and extended diagnostic and watchdog functions ensure SIL3 capability. Via the SIL3-capable bus system and the CANopen safety protocol, each rotary encoder outputs the position value that has been recorded twice, checked for plausibility and processed in separate microcontrollers, normally and bit-inverted. The usual safety check then takes place in the safety controller to determine whether both values arrive within a time window and whether they are identical - apart from the inversion. If this is not the case, an alarm is triggered and the vehicle is stopped.
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