Yokogawa SDV144-S53 S4 ProSafe-RS Digital Input Module
Manufacturer: Yokogawa
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Part Number: SDV144-S53/STB4S-10
Condition：New with Original Package
Product Type: Digital Input Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa SDV144-S53 S4 Digital Input Module
Configured for high-integrity discrete signal acquisition in ProSafe-RS and CENTUM VP platforms, the Yokogawa SDV144-S53 S4 (SDV144 Digital Input Module) provides direct physical/electrical execution. This 16-channel module accepts no-voltage dry contact inputs from emergency shutdown pushbuttons, position limit switches, and process interlocks. Operating on a 24 VDC field voltage architecture, the module converts discrete state changes into system logic signals while maintaining full galvanic isolation between field loops and internal system buses.
Suffix Breakdown & Model Matrix
| Suffix / Option Code | Designation | Technical Description |
|---|---|---|
| SDV144 | Base Model | Digital Input Module (16-channel, 24 VDC, module isolation) |
| -S | Type | Standard operational specification |
| 5 | Connection / Protection | For pressure clamp terminal block or MIL cable; no explosion protection |
| 3 | Coating & Temperature | ISA Standard G3 conformal coating with extended temperature range (-20 to 70 deg C) |
| S4 | Style Code | Revision design style 4 |
| /STB4D-10 | Terminal Block Option | Pressure clamp terminal block with integrated surge absorbers |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SDV144-S53 S4 |
| Brand | Yokogawa |
| Origin | Indonesia / Japan |
| Weight | 0.36 kg (Net) |
| Dimensions | 130.0 mm x 32.8 mm x 107.5 mm |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | 290 mA max at 5 VDC (backplane), 140 mA max at 24 VDC (external field loop) |
| Channel Capacity | 16 discrete digital inputs (module isolation) |
| Input Signal Type | No-voltage dry contact |
| ON State Threshold | Contact resistance <= 1 kohm |
| OFF State Threshold | Contact resistance >= 100 kohm |
| Input Current | 6 mA +/-20% at 24 VDC (0 ohm contact resistance) |
| Maximum Input Voltage | 30 VDC |
| Input Response Time | <= 40 ms |
| Dielectric Strength | 2000 VAC for 1 minute (channel-to-system) |
| Conformal Coating | ISA Standard G3 class |
Galvanic Isolation & Field Loop Diagnostics
The module features optical galvanic isolation rated for 2000 VAC across 1 minute, preventing high-voltage transients on field wiring from reaching the internal system backplane. Designed for deployment in critical safety instrumented functions (SIF), the input detection circuitry continuously monitors loop integrity using internal diagnostic pulse testing to detect open-circuit field wire breaks and short circuits. Combined with the ISA Standard G3 conformal coating, the hardware maintains long-term component integrity in hydrogen sulfide and chlorine environments, maintaining contact detection accuracy without signal degradation across extended temperature spans.
Frequently Asked Questions
Q: What contact conditions determine an explicit ON or OFF state for this input module?
A: The module registers an ON condition when field contact resistance is 1 kohm or lower. An OFF condition requires a field loop impedance of 100 kohm or higher at an input current level of 6 mA nominal.
Q: How does the STB4D-10 terminal block enhance module protection?
A: The STB4D-10 terminal block incorporates dedicated hardware surge absorbers across the connection terminals. This diverts field-induced voltage spikes away from the internal optocouplers and limits transient overvoltages to safe operating levels.
Q: Is online replacement supported during normal system operation?
A: Yes, the unit supports hot-swapping inside the I/O nest. Technicians must ensure that external 24 VDC field power loop connections remain grounded and secure during the replacement procedure to avoid transient field noise.
Field Installation Guidelines
Mount the module directly into an available slot inside the IOM nest. Secure the STB4D-10 pressure clamp terminal block using the front retention screws to ensure uninterrupted contact with the backplane connector. Verify that all field contact power wiring originates from an external 24 VDC supply capable of delivering at least 200 mA with a voltage stability within +20% / -10%.
Strip signal wires to 6 mm and terminate them securely into the pressure clamp terminals. Route field input cables in separate, grounded cable trays positioned at least 300 mm away from high-voltage AC power lines to avoid inductive noise coupling. Connect all cable shields to the cabinet functional earth busbar using low-impedance clamps, keeping shield pigtails as short as possible to preserve high-frequency noise immunity.