Configured for high-precision temperature and millivolt acquisition in CENTUM VP/CS distributed control systems, the Yokogawa ATT4S-00 S2 (ATT4S Analog Input Module) provides direct physical/electrical execution. This 16-channel hardware subassembly interfaces directly with field-mounted transmitters, thermocouples, resistance temperature detectors (RTDs), potentiometers, and low-voltage analog sources. The unit maps raw incoming analog voltage and resistance variations into digital process variables while executing localized circuit isolation to maintain measurement fidelity.
| Parameter | Specification |
|---|---|
| Model | ATT4S-00 S2 |
| Brand | Yokogawa Electric Corporation |
| Origin | Japan |
| Weight | 0.3 kg (Net block assembly: 0.2 kg) |
| Dimensions | 130 x 127.2 x 32.8 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 350 mA at 5 V DC |
| Input Channels | 16 isolated analog inputs |
| Input Signal Types | Thermocouples (Types J, K, E, B, R, S, T, N); RTD (Pt100, JPt100); Potentiometer; mV signals |
| Input Range | TC: -100 to +1800 deg C (Type dependent); RTD: -200 to +650 deg C; mV: -100 to +150 mV |
| Reference Junction Compensation | +/- 1 deg C |
| Accuracy | +/- 40 uV (TC/mV); +/- 150 mOhm (RTD); +/- 0.2% FS (POT) |
| Response Time / Update Period | <= 1 s typical |
| Burn-out Detection | Configurable (UP/DOWN), detection time ~60 s |
| Temperature Drift | +/- 80 uV / 10 deg C |
| Isolation | 500 V AC (Signal-to-system, 1 min); 200 V AC between channels |
| Storage Temperature | -40 to +85 deg C |
| External Connection | KS1/KS8 cable interface / Pressure clamp terminal block |
| Environmental Protection | ISA Standard G3 conformal coating |
| Certification Code | C3HM04362J TEMP CODE CLI-DIV2 GPS A, B, C, D T4 |
The hardware assembly integrates a dedicated 4-20 mA HART loop protocol architecture overlay alongside its multi-signal analog front-end. Channel-to-channel isolation utilizes dedicated physical barriers rated at 200 V AC to prevent localized ground loop currents from destabilizing sensor readings. For precision thermal processing, an embedded cold junction compensation (CJC) network executes real-time reference drift attenuation bounded at +/- 1 deg C. System safety and signal-to-system isolation are maintained by a 500 V AC galvanic barrier that insulates the core FIO backplane bus from external electrical field anomalies. The S2 build includes factory-applied ISA Standard G3 conformal coating, verifying compliance for Class I, Division 2, Groups A, B, C, and D hazardous locations under a T4 temperature code rating.
Q: How does the ATT4S-00 S2 handle internal reference junction tracking during external ambient shifts?
A: The module relies on localized embedded thermistors located near the pressure clamp terminals to perform cold junction compensation. The system calculates tracking modifications dynamically, limiting errors to within +/- 1 deg C across the comprehensive -20 to +70 deg C operating window.
Q: What are the backplane load limitations when populated alongside high-density digital modules?
A: The module draws approximately 350 mA from the FIO 5 V DC bus. Plant engineers must compile the cumulative current draw of all modules inside the node slot matrix to verify that the total load does not breach the upper threshold of the local system power supply unit.
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