Field Instrument or Design for Pull Cord in Belt Bonveyor

We places a pull cord in belt conveyor for emergency stop, but we have always problem since the wiring is in parallel that very consuming to check if there is faulty. Any better design/sensor/wiring for pull cord switch in belt conveyor?

Look at Allen-Bradley's Guard Link line:
https://ab.rockwellautomation.com/allenbradley/safety/guardlink.page

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