The Yokogawa SAV144-S63, also cataloged as the Yokogawa SAV144 Digital Input Module, operates as a dedicated hardware component for process monitoring within CENTUM VP and CENTUM CS control system platforms. The terminal infrastructure executes localized loop scanning and acquisition of physical no-voltage dry contact signals to transmit deterministic status updates directly to the central control processor backplane.
| Parameter | Specification |
|---|---|
| Model | SAV144-S63 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.5 kg |
| Dimensions | 81 x 103 x 146 mm |
| Operating Temp | 0 to 55 deg C |
| Storage Temp | -20 to 75 deg C |
| Power Supply | 5 VDC plus/minus 5% via system bus |
| Power Consumption | Approximately 0.5 A current draw |
| Input Channels | 16 isolated channels |
| Signal Type | No-voltage contact (Dry contact) |
| ON Resistance | Less than or equal to 1 kΩ |
| OFF Resistance | Greater than or equal to 100 kΩ |
| Input Resolution | 16-bit equivalent processing |
| Isolation Voltage | Optical and electrical isolation across input and system bus |
The electronic layout incorporates optical and electrical isolation boundaries across all 16 input channels to intercept external common-mode electrical noise before it accesses the system bus. The input detection circuits interface transparently alongside 4-20 mA HART loop protocol architectures, ensuring that high-voltage spikes, field ground loops, or accidental cross-wiring anomalies do not pass into adjacent processing modules. This internal galvanic isolation layer filters electrical transients and limits signal cross-talk to maintain accurate digital state evaluation for critical interlock and alarm parameters.
Q: How does the internal controller handle active input channel states during a field wiring break?
A: The hardware logic evaluates input impedance boundaries; when the loop electrical resistance breaks past the 100 kΩ threshold, the internal register establishes a definitive OFF state and sets diagnostic bits to flag an open-loop condition.
Q: Can this specific input card interface directly with active, powered field switches?
A: The hardware terminal paths are engineered exclusively for no-voltage dry contact operations. Connecting external active voltage sources will bypass the internal current-limiting components and risk damaging the channel optocouplers.
Q: What cables are specified to bridge this module to its respective field terminal board?
A: The module physical interface is designed to pair with AKB-series system cables, matching pin-to-pin mapping layouts to maintain signal isolation integrity down to the terminal terminal rail.
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