showstack / glossary / limit-switch
Limit switch 限位開關
A sensor that tells an automation controller a moving axis has reached the end of its travel. Usually two layers: soft limits set in software for normal operation, and hard limits wired into the safety circuit for when the software is wrong.
中文
告訴自動化控制器某一運動軸已到達行程末端的感測器。通常分兩層：軟體中設定、供正常運作使用的軟限位，以及接入安全迴路、在軟體出錯時作用的硬限位。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Limit switch | |
| HK / TW | 限位開關 / 極限開關 |
Easy to get wrong
A soft limit is a setting and can be edited or lost with a show file. A hard limit is wiring. If a rig has only soft limits, it has no protection against the file being wrong.
Next to this
E-stop / emergency stop緊急停止The mushroom-head button that removes motive power from an automation system immediately. It is a category of…Deadman / hold-to-run持壓運轉開關A control that only allows motion while an operator is actively holding it, so releasing it, or gripping it i…
Sources
- ANSI E1.43 Performer Flying Systems — ESTA TSP primary
Understand the mechanism
Something wrong, or missing?
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