YOKOGAWA ASI133-S00 Analog Input Module – CENTUM VP Series

YOKOGAWA ASI133-S00: 8-Channel Isolated Analog Input Module for Mission-Critical Process Control

The ASI133-S00 is an 8-channel analog input module engineered for deployment within YOKOGAWA’s CENTUM VP, CENTUM CS 3000, and ProSafe-RS distributed control system platforms. Designed to operate in continuous-process industries — including oil & gas upstream/downstream, petrochemical refining, LNG terminals, and utility power generation — this module performs precision signal acquisition from field transmitters operating at 4–20 mA DC or 1–5 V DC. Its 16-bit A/D conversion resolution delivers a measurement accuracy that satisfies the tight loop-control tolerances demanded by regulatory and safety-instrumented systems alike.

Each of the eight input channels is galvanically isolated from the backplane bus and from adjacent channels, a design choice that directly suppresses ground-loop interference and common-mode noise — both endemic in large-scale industrial installations where cable runs may exceed several hundred meters across electrically noisy environments. The module supports HART (Highway Addressable Remote Transducer) pass-through on all channels, enabling secondary variable readback, device diagnostics, and remote configuration of HART-capable field instruments without interrupting the primary 4–20 mA process signal.

Hot-swap capability allows the ASI133-S00 to be inserted or removed from a powered field control station (FCS) without requiring a system shutdown, a critical operational attribute in facilities where continuous uptime is a contractual or safety obligation. The module’s self-diagnostic routines execute at the hardware level, reporting channel-level faults — open wire, over-range, under-range — directly to the FCS CPU via the high-speed V-net/IP or Vnet backplane, enabling operators to act on instrument failures before they propagate to process upsets.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The ASI133-S00’s internal architecture centers on a dedicated per-channel signal conditioning front-end followed by a multiplexed 16-bit successive-approximation register (SAR) ADC. Each channel’s analog front-end incorporates a precision instrumentation amplifier with a common-mode rejection ratio (CMRR) exceeding 120 dB at 50/60 Hz, which is the primary mechanism by which the module suppresses power-line frequency interference — a persistent noise source in industrial panel environments where AC power cabling runs parallel to signal wiring.

Galvanic isolation is implemented via optocoupler barriers between the field-side analog circuitry and the digital processing section. This isolation boundary sustains a working voltage of 500 V DC channel-to-ground, preventing fault currents from field wiring from reaching the backplane bus or the FCS CPU. In multi-drop HART configurations, the module’s HART modem circuitry superimposes the FSK (Frequency Shift Keying) signal at 1200/2200 Hz onto the 4–20 mA loop without disturbing the DC process value, maintaining simultaneous analog and digital communication on the same two-wire pair.

The module’s EMC design follows IEC 61000-4 series test criteria. Transient suppression diodes (TVS) at each field terminal clamp voltage spikes from inductive load switching — a common occurrence when solenoid valves or relay coils share the same field junction box. The PCB layout employs a split ground plane strategy: the analog ground and digital ground are joined at a single star point, minimizing digital switching noise from coupling into the high-impedance analog measurement path. This layout discipline is particularly relevant in high-density I/O nests where multiple modules share a common backplane power rail.

Firmware-level diagnostics run a continuous background self-test cycle that checks ADC linearity, reference voltage stability, and optocoupler integrity. Any deviation beyond defined thresholds generates a module-level alarm that propagates to the FCS CPU within one scan cycle, typically 100–500 ms depending on FCS configuration, ensuring that instrument failures are surfaced to the operator HMI without delay.

System Integration Benefits

• Deterministic scan-cycle alignment: The ASI133-S00 synchronizes its A/D conversion timing to the FCS backplane scan clock, ensuring that all 8 channel values are sampled within a single consistent time window. This eliminates inter-channel timestamp skew, which is critical for ratio control loops and cascade strategies where two measured variables must be compared at the same process instant.
• HART secondary variable utilization: Beyond the primary 4–20 mA process variable, HART pass-through allows the FCS to read secondary and tertiary variables (e.g., sensor temperature, percent range, loop current) from multivariable transmitters. This data can be routed to historian or APC (Advanced Process Control) applications without additional field wiring.
• Transparent channel-level diagnostics: Open-wire detection, over-range, and under-range conditions are reported as discrete fault codes at the individual channel level — not as a module-level aggregate alarm. Maintenance personnel can identify the exact field instrument or wiring segment at fault from the operator station, reducing mean time to repair (MTTR).
• Non-disruptive hot-swap maintenance: Module replacement during live plant operation eliminates the need for partial shutdown procedures. After insertion, the FCS automatically re-initializes the replacement module and resumes normal scanning within seconds, with no operator intervention required beyond physical module seating.
• SIL-capable deployment in ProSafe-RS: When installed in a ProSafe-RS safety controller nest, the ASI133-S00 participates in the safety-instrumented system (SIS) architecture. The module’s hardware design supports the diagnostic coverage requirements for SIL 2 loop configurations, as defined under IEC 61511, enabling consolidated safety and process control I/O infrastructure.
• Reduced field wiring complexity via HART: Instrument configuration, loop calibration, and device identification can be performed remotely from the engineering workstation over the existing 4–20 mA loop. This eliminates the need for a technician to carry a handheld HART communicator to the field terminal for routine configuration tasks.
• Backplane bandwidth efficiency: The module communicates with the FCS CPU over the V-net/IP backplane at data rates that do not impose measurable latency on the overall FCS scan cycle. In high-density configurations with 16 or more I/O modules per FCS, the ASI133-S00’s compact data frame format preserves backplane bandwidth for time-critical control data.
• Long-term platform compatibility: YOKOGAWA maintains backward hardware compatibility across CENTUM VP generations. The ASI133-S00 is supported by current CENTUM VP R6.x engineering software, ensuring that existing FCS configurations can incorporate replacement modules without requiring database migration or re-engineering of I/O assignments.

Quality Assurance & Global Logistics

Every ASI133-S00 unit supplied by siemensplc.com is sourced as genuine YOKOGAWA OEM hardware. Each module carries YOKOGAWA’s original factory serial number and is traceable through YOKOGAWA’s product authentication system. Prior to dispatch, units undergo incoming inspection that includes visual examination of the PCB and connector integrity, firmware version verification, and functional power-on testing to confirm that the module initializes correctly and passes its internal self-diagnostic sequence.

Our inventory is held at our Xiamen, China facility, positioned within the Fujian Free Trade Zone logistics corridor, which provides direct access to Xiamen Gaoqi International Airport and Xiamen Port — two of China’s primary export hubs for industrial electronics. Standard international shipments are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with transit times of 3–7 business days to most destinations in Southeast Asia, the Middle East, Europe, and the Americas. For urgent plant-maintenance requirements, same-day dispatch is available for orders confirmed before 14:00 CST.

All shipments are accompanied by a commercial invoice, packing list, and certificate of origin. Export classification is handled in accordance with China Customs HS Code requirements for industrial control modules. Customers requiring YOKOGAWA factory test reports or material certificates for their incoming quality control procedures may request these documents at the time of order placement.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.