| ABSENT? | PHYSICAL ABSENCE INTERLOCK | These items are absence inspections, not electrical connections. Any presence is a stop-work failure. |
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| DAQC? | ISOLATED LOW-ENERGY CONTACT ACQUISITION | SIG-007 through SIG-011. Instrument excitation must be isolated and low energy. |
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| DAQS? | ISOLATED STIMULUS/STATE LOGGER | SIG-012 through SIG-015. Exact dry-contact fixtures and logger remain unselected. |
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| DAQV? | ISOLATED VOLTAGE/CURRENT ACQUISITION | SIG-001 through SIG-006. Exact probes and current measurement topology remain unselected. |
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| EDISC? | MANUAL EMERGENCY ISOLATION - SELECTION REQUIRED | Visible, reachable fixture isolation device; exact device and DC rating remain unselected. |
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| EDMSIM? | CONFIGURATION-CONTROLLED DRY-CONTACT EDM SIMULATOR | K1/K2 contactors are absent. Exact simulator switch hardware, anti-tamper state indication and contact rating are SELECTION REQUIRED. |
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| F24 | P1.21 F24 - SELECTION REQUIRED | DUT protection position from P1.21. No fuse value is released. |
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| HBSRC? | ISOLATED PATTERN SOURCE / LOGGER - SELECTION REQUIRED | No Raspberry Pi or motion supervisor is required in the no-load fixture; exact pattern source remains unselected. |
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| JWF1 | P1.21 WATCHDOG FEEDBACK INTERFACE | Connector pin identity from P1.21. |
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| JWH1 | P1.21 HEARTBEAT INTERFACE | Heartbeat source must be isolated, configuration controlled and timestamped. |
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| JWP1 | P1.21 WATCHDOG PCB POWER/COIL INTERFACE | Connector pin identity from P1.21; physical connector and PCB validation remain open. |
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| KWD1,KWD2 | P1.21 PHOENIX 2967060 CANDIDATE | Exact P1.21 terminals. Ordinary relay; no safety credit. |
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| PSFIX? | ISOLATED CURRENT-LIMITED 24 V SOURCE - SELECTION REQUIRED | Exact source, limits, protection, isolation and calibration remain AUTH-006/AUTH-007 holds. |
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| S0 | P1.21 DUAL-CHANNEL E-STOP | Both channels require independent state capture; received terminal positions remain verification work. |
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| S1 | P1.21 SR1 RESET | Terminal mapping remains received-lot verification work. |
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| S2 | P1.21 ARM PUSHBUTTON | Falling edge must be independently timestamped; terminal mapping remains received-lot work. |
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| SR1 | P1.21 SR1 SAFETY RELAY | Terminal/net identity copied from P1.21; exact article and qualified application remain outside fixture release. |
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| SRA1 |
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