Honeywell MC2-440-10TVB-1-21

Technical Specifications

1. Complete Model Code: MC2-440-10TVB-1-21
2. Channel Quantity: 4 independent galvanically isolated analog output channels
3. Standard Output Signal: 4–20mA DC linear current loop signal
4. Load Driving Capacity: Maximum 750Ω external load resistance per single channel
5. Isolation Voltage Strength: 1800VAC channel-to-backplane reinforced isolation
6. Power Supply: DCS rack backplane 24VDC power input, module total consumption ≤220mA
7. Operating Temperature Band: -20°C ~ +60°C; storage temperature -40°C ~ +85°C
8. Humidity Range: 5%–95% relative humidity non-condensing
9. Protection Class: Front panel IP20
10. Communication Interface: Honeywell MC series proprietary parallel DCS backplane bus

Function Features

1. Independent channel output current closed-loop feedback circuit guarantees stable 4–20mA signal output regardless of external load resistance fluctuation
2. Full-channel galvanic isolation blocks reverse surge current generated by field valve actuator coil power-off
3. Hardware configurable output signal fail-safe mode: user-selectable 4mA, 12mA or 20mA fixed output upon DCS rack power failure
4. Built-in short-circuit protection circuit per channel; automatic current limiting when output terminal short-circuited without module permanent damage
5. Independent red LED fault indicator for each channel, lighting upon over-load, short-circuit or backplane communication failure
6. Hot-swappable plug-in design supporting online module replacement without interrupting other channel analog output control

Performance Parameters

• Analog output linearity error: ≤0.07% full 4–20mA span
• Long-term output drift: <0.09% full scale per year continuous operation
• EMC Standard Compliance: IEC 61000-6-2 heavy industrial process control electromagnetic standard
• Maximum response speed: 50μs digital command to analog output signal conversion delay

Material Composition

1. Main Circuit PCB: FR-4 flame retardant high-temperature substrate with anti-moisture conformal coating
2. Isolation Components: Analog isolation transformers with reinforced insulation encapsulation per channel
3. Drive Chips: Industrial-grade high-precision current output operational amplifiers
4. Front Housing Panel: Cold-rolled steel electrostatic anti-rust spray coating with complete model printing
5. Wiring Terminal Block: Detachable gold-plated copper screw terminal assembly

Structural Features

1. Single-slot Eurocard horizontal plug-in form factor for Honeywell MC2 series DCS control rack
2. Dual left/right plastic locking pull tabs with stainless steel springs for vibration-resistant rack fixation
3. Removable front wiring terminal block; field actuator wiring harness remains connected during module disassembly
4. Physical isolation copper barrier separates DCS backplane logic circuit and field analog output drive circuit layers
5. Uniform front panel ventilation slits for passive heat dissipation of output drive operational amplifiers

Working Principle

1. DCS main controller transmits digital control value via rack backplane bus to MC2-440-10TVB-1-21 internal logic chip
2. Digital-to-analog conversion circuit converts digital setpoint into base analog voltage signal
3. Isolation transformer electrically separates DCS low-voltage logic circuit and field high-interference actuator circuit
4. Closed-loop current drive amplifier outputs stabilized 4–20mA current signal to field analog actuators, real-time load current feedback adjusts output to maintain linearity
5. Short-circuit detection circuit monitors channel output current; overload triggers current limiting and LED fault indicator activation

Advantage Highlights

1. 750Ω high load driving capacity supports long-distance field valve wiring without additional signal repeaters
2. User configurable power failure fail-safe output mode prevents uncontrolled process equipment movement during DCS power loss
3. Independent channel short-circuit current limiting avoids single actuator fault shutting down all module output channels
4. Full-channel isolation eliminates reverse surge current damage risk to expensive DCS main control rack backplane
5. Hot-swap maintenance minimizes production process downtime during analog output channel module failure replacement

Applicable Industries

Installation Requirements

1. Mount only into Honeywell MC2 series original 19-inch DCS rack single slot; maintain ≥10mm vertical ventilation clearance with adjacent modules
2. Field analog actuator wiring uses shielded twisted pair cable; shielding layer single-point grounded at DCS cabinet earth bar
3. Terminal wiring maximum wire cross-section 1.0mm²; terminal screw tightening torque fixed at 0.7 N·m
4. Cabinet internal ambient temperature controlled below 60°C; forced cooling fan required for high-density rack layout
5. Rack backplane 24VDC power supply voltage fluctuation strictly limited within ±5% rated voltage

Usage Notes

1. Do not connect external power supply to module output terminals; all 4–20mA loop power supplied internally by the module
2. Field actuator load resistance must not exceed rated 750Ω to avoid output signal linearity distortion
3. Set fail-safe output mode according to process safety requirements before formal system commissioning
4. Annual inspection of terminal wiring tightness to prevent oxidation-induced output signal drift
5. Prohibit liquid solvent cleaning of PCB circuit board; dry oil-free compressed air dust removal only