Product Core Brief
- Model: VC401-10
- Brand: Yokogawa
- Series: CENTUM CS/VP System Coupler Module
- Core Function: Coupler module for CENTUM CS/VP systems, supporting analog output signal generation for process control loops.
- Product Type: Analog Output Coupler Module
- Key Specs: 4-20mA / 1-5V DC output | 16-bit DAC | ±0.05% FS accuracy | HW bus communication | open-circuit alarm
- Condition: New Original / New Surplus
Key Technical Specifications
- Manufacturer: Yokogawa
- Part Number:
- Module Type: Analog Output Coupler Module
- System Family: Yokogawa CENTUM CS/VP distributed control system
- Output Signals: 4-20mA current, 1-5V DC voltage
- Resolution: 16-bit digital-to-analog conversion (DAC)
- Accuracy: ±0.05% FS (full scale)
- Communication: Yokogawa internal HW bus for controller communication
- Diagnostics: Fault diagnosis interface, open-circuit alarm, module status monitoring
- Output Characteristics: Configurable linear or non-linear output
- Mounting: CENTUM CS/VP rack-mounted coupler module
- Typical Applications: Control valve positioning, VFD speed reference, analog setpoint output, CENTUM CS/VP system maintenance and spare stocking
Product Introduction
The VC401-10 is a Yokogawa analog output coupler module for the CENTUM CS/VP distributed control system. It converts digital control commands from the CENTUM CS/VP controller into standard industrial analog signals — typically 4-20mA or 1-5V DC — to drive field actuators such as control valves, VFDs, and other analog-input devices.
With 16-bit DAC resolution and ±0.05% FS accuracy, the VC401-10 delivers precise and stable analog output for critical control loops. Built-in hardware filtering, software calibration, and open-circuit alarm functions help maintain long-term reliability in demanding process environments such as oil and gas, petrochemical, power generation, and chemical processing.
For maintenance and procurement teams, the VC401-10 is a direct-fit replacement in existing CENTUM CS/VP racks, supporting legacy system maintenance without reworking field wiring or system configuration.
QA & Testing SOP
Analog output couplers are critical control path components, so verification focuses on output accuracy and system integration.
- Label and authenticity check: Verify part number VC401-10, serial number, manufacturing markings, and revision suffix against OEM references.
- Visual inspection: Check front connectors, backplane connector, housing, LEDs, and PCB for heat damage, corrosion, or rework.
- Rack power-up test: Install in a compatible CENTUM CS/VP rack and verify normal module initialization with no fault LEDs.
- Output accuracy test: Command known output values and measure 4-20mA / 1-5V DC signals with a calibrated multimeter to confirm ±0.05% FS accuracy.
- Open-circuit alarm check: Simulate an open-circuit condition and verify the module reports the fault to the controller.
- Bus communication check: Confirm the module communicates properly over the Yokogawa HW bus with the system controller.
- ESD-safe packing: Ship in anti-static packaging with connector protection, plus label photos for receiving QA.
Installation Pitfalls & Guide
❗ Confirm system compatibility before installation. The VC401-10 is designed for CENTUM CS/VP systems. Installing it in an incompatible rack will prevent proper operation.
❗ Verify the revision suffix. Units with different suffix codes may have firmware or hardware differences. Match the revision to the existing installed unit or system documentation.
❗ Do not hot-swap without procedure. Removing or inserting a coupler module in a live CENTUM CS/VP rack can disturb the control bus and cause unintended output changes. Follow plant MOC and system procedures.
❗ Check output wiring polarity. Reversed 4-20mA wiring will prevent proper actuator operation and may trigger open-circuit alarms.
Replacement steps:
- Pre-install: Confirm rack type, slot position, revision suffix, and output wiring configuration.
- Isolate loop: Place affected control loops in manual or safe state per plant procedures.
- Replace module: Remove the faulty unit, install the VC401-10, and verify seating and connector engagement.
- Commission: Restore power, verify module status, test output signals, confirm controller communication, and return loops to automatic operation.
Technical FAQ
Is pricing flexible? Yes. Price depends on condition, stock availability, revision suffix, test records, and whether the unit is new original or new surplus. Urgent shutdown replacements can be prioritized.
What warranty is included? Surplus CENTUM CS/VP modules usually carry a limited functional warranty, often 30–90 days, unless otherwise agreed. Final terms depend on stock source and customer QA requirements.
Can VC401-10 replace other VC401 variants? The VC401-10 is a specific variant within the VC401 coupler family. Other suffixes may differ in channel count, output type, or firmware. Confirm compatibility against system documentation before substituting.
What output signals does it support? It supports 4-20mA current and 1-5V DC voltage outputs with configurable linear or non-linear characteristics.
Do you provide test records? We can provide label photos, bench power-up notes, output accuracy measurements, and packing records. Full rack-level testing or FAT-style reports can be arranged if required.
