Product Short Description
Product Overview
MC-TDOY22 is the matched field terminal board of MC-PDOY22 digital output processor card, responsible for distributing isolated 24VDC switching output signals to field actuators including solenoid valves, alarm buzzers and indicator lamps. It integrates signal isolation, surge absorption and terminal wiring functions, serving as the bridge between DCS control logic and on-site execution equipment.
Description
Core Technical Specifications
- Output Channel Quantity: 32 galvanically isolated digital output channels
- Rated Load Voltage Range: 15 VDC ~ 30 VDC (24 VDC standard industrial power)
- Single Channel Max Load Current: 0.5 A inductive / resistive load
- Total Module Maximum Load Current: 5 A
- Isolation Voltage: 1500 VAC channel-to-backplane isolation
- Surge Protection: Built-in TVS transient voltage suppression diode for each channel
- Terminal Form: Orange spring compression quick wiring terminals
- Connection Interface: Dual 50-pin shielded ribbon cable connectors to MC-PDOY22
- Operating Temperature Range: -40°C ~ +70°C
- Storage Temperature: -40°C ~ +85°C
- Environmental Humidity: 5% ~ 95% RH non-condensing
- PCB Coating: Full conformal anti-corrosion coating
- Overall Dimension: 307 mm × 120 mm × 68 mm
- Net Weight: 0.75 kg
Function Features
- Independent surge absorption circuit for every channel, suppress back EMF from inductive loads (valves, relays)
- Each output channel equipped with status LED indicator for on-site troubleshooting
- Spring compression terminals support fast wiring, reduce maintenance time cost
- High anti-EMI circuit layout, eliminate signal interference in dense marshalling cabinets
- Compatible with Honeywell TDC3000, Experion PKS all series DCS control racks
- Support hot-swappable processor card coordination, no need to cut field load power when replacing MC-PDOY22
- Modular parallel installation design, flexible channel capacity expansion according to process points
Working Principle
Logic output signals from MC-PDOY22 processor card are transmitted via shielded ribbon cable to MC-TDOY22 internal isolation circuit. The optocoupler array completely isolates low-voltage control bus and high-voltage field load circuit. When DCS sends “ON” logic signal, corresponding channel internal transistor conducts, output 24VDC power to drive field actuators; when “OFF” signal arrives, transistor cuts off load power instantly. TVS diode parallel at each terminal absorbs reverse electromotive force generated by inductive load power-off, protecting internal circuit components from breakdown. LED indicator synchronizes with output channel on-off state for visual monitoring.
Material & Structural Characteristics
- Main PCB: High-temperature FR4 green solder mask board with full polyurethane conformal coating
- Terminal Blocks: Flame-retardant PA66 orange spring terminals, vibration-resistant wiring retention
- Connectors: Gold-plated multi-pin ribbon cable sockets with locking buckle to prevent loose contact
- Mounting Components: Anti-rust stainless steel support studs and shock-absorbing silicone pads
- Internal Circuit Components: Industrial grade optocouplers, fast TVS diodes, low-leakage switching transistors
Installation Requirements
- Vertical panel mounting inside DCS marshalling cabinet, four-point fixed installation
- Separate field load power wiring and DCS communication signal wiring with metal isolation partition
- All field actuator cables use shielded twisted pair, shield single-point grounded at cabinet earth bar
- Ribbon cable between MC-TDOY22 and MC-PDOY22 must adopt original Honeywell shielded dedicated cable
- Reserve 10 mm ventilation gap between adjacent FTA boards to avoid heat accumulation
- Cabinet earth bar ground resistance ≤4 Ω to guarantee surge protection effect
Application Scenarios
- Petrochemical plant remote solenoid valve switch control
- Power plant boiler auxiliary pump, fan start-stop output control
- Fire protection system alarm light, siren drive output
- Water treatment dosing valve, drainage valve remote control
- Metallurgy furnace safety interlock alarm indicator control
- Pharmaceutical automatic production line cylinder, conveyor actuator drive
Operation & Maintenance Notes
- Cut off field 24VDC load power before replacing or rewiring terminals
- When driving large inductive loads, add external freewheeling diode at field equipment terminal to reduce circuit impact
- Check LED indicator status every weekly inspection to judge channel output fault
- Do not connect load current exceeding 0.5 A per single channel, otherwise internal transistor will burn out
- Use dry compressed air to blow dust on PCB surface every 6 months, liquid cleaning agent forbidden
- Avoid installing MC-TDOY22 near high-frequency inverters and large contactors to reduce EMI interference
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