| Control unit in automatic mode, no register errors |
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| Control unit in automatic mode, register errors exceed warning threshold | |||||
| Control unit in automatic mode, register errors exceed error threshold | |||||
| Control unit in manual mode (no control) |
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| Control unit switched off (inactive) | |||||
| Presetting process active for this control unit | |||||
| Control unit signals mark alarm (mark to be detected is defective or missing) | |||||