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| Interactions | Action required but not provided | Unsafe action provided | Incorrect timing/order | Terminated too soon/applied too long |
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| C1. Check | HUP18 operator has not routinely checked | HUP19 illegal shut down or destroy the security system | — | — |
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| C2. Limit running | Same as “component failure.” | HUP20 security device setting error or fault | HUP21 security device is not sensitive | — |
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| C3. Operating | HUP22, the operator has not performed the operation | HUP23 misoperation of operator | HUP24 Operator’s operation is not timely | HUP25 insufficient or excessive lifting height and swivel angle |
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| C4. Operating | HUP26 rigger has not checked the lifting system | HUP27 rigger illegally has bound or placed the lifting object | HUP28 rigger has not escaped to a safe place when lifting | — |
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| C5. Command | HUP29 signalman has not provided command | HUP30 command error | HUP31 command not timely | — |
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| C6. Command | HUP29 signalman has not provided command | HUP30 command error | HUP31 command not timely | — |
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| F1. Observation | HUP32 signalman has not observed the status of tower crane | HUP33 signalman has misjudged the status of tower crane | — | — |
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| F2. Monitor | HUP34 the tower crane monitoring system is not open | HUP35 sensors are not sensitive | — | — |
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| F3. Feedback | HUP36 monitoring data have not uploaded | HUP37 data missing or error | HUP38 data is not uploaded timely | — |
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| F4. State display | HUP39 monitoring data is not visual | HUP40 wrong data have been displayed to the operator | — | — |
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| F5. Feedback | HUP41 operator has not submitted feedback to the signalman | HUP42 feedback information missing or error | HUP43 feedback is not timely | — |
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| F6. Feedback | HUP44 rigger has not sent a signal | HUP45 signal sending error | HUP46 the signal is not sent in time | — |
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| F7. Warning | HUP47 lack of alarm | HUP48 false alarm | — | HUP49 alarm ringing after trouble removal |
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| F8. Observation | HUP50 operator has not observed the status of tower crane | HUP51 operator has misjudged the status of tower crane | — | — |
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| F9. Observation | HUP52 rigger has not observed the status of tower crane | HUP53 rigger has misjudged the status of tower crane | — | — |
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