Description
The Delta DVP04TC-S is a 4-channel thermocouple input module designed for the DVP-S series programmable logic controllers (PLCs). This I/O module converts thermocouple temperature signals (J, K, R, S, T types) into 14-bit digital values for temperature measurement and control applications. Featuring a compact DIN-rail mounting design, dual 7-segment display for real-time monitoring, and RS-485 communication interface, it provides reliable temperature data acquisition in industrial automation systems. With cold junction compensation, self-diagnostic functions, and configurable averaging, this module ensures accurate temperature measurement for process control, machine monitoring, and HVAC applications. The module supports direct connection to Delta DVP-S series PLCs and can be configured via FROM/TO instructions or RS-485 Modbus communication.
Key Features
- 4-Channel Thermocouple Input: Supports J, K, R, S, T type thermocouples
- High Resolution: 14-bit conversion (0.1°C resolution for Celsius)
- Cold Junction Compensation: Built-in compensation for accurate measurement
- Dual 7-Segment Display: Real-time temperature monitoring
- RS-485 Communication: Modbus RTU/ASCII protocol support
- Self-Diagnostic Functions: Open circuit detection, over-range alarm
- Configurable Averaging: Programmable averaging cycles (1-4096 times)
- DIN-Rail Mounting: Compact design for easy installation
- Isolation: Digital-analog isolation (500V DC)
- Power Supply: 24V DC (±15%)
Technical Specifications
Parameter | Specification |
|---|---|
Input Channels | 4 channels (CH1-CH4) |
Thermocouple Types | J, K, R, S, T type |
Temperature Range | J: -100°C to +700°C K: -100°C to +1000°C R: 0°C to +1600°C S: 0°C to +1600°C T: -100°C to +400°C |
Resolution | 14 bits (0.1°C for Celsius, 0.18°F for Fahrenheit) |
Accuracy | ±0.5% FS @ 25°C ±1.0% FS @ 0-55°C |
Conversion Speed | 250 ms per channel (typical) |
Cold Junction Compensation | Built-in, automatic |
Display | Dual 7-segment LED (upper: red, lower: green) |
Communication Interface | RS-485 (Modbus RTU/ASCII) |
Baud Rate | 4800/9600/19200/38400/57600/115200 bps |
Power Supply | 24V DC (20.4V-28.8V DC) |
Power Consumption | ≤2.4W (100mA @ 24V DC) |
Isolation Voltage | 500V DC (channel to system) |
Operating Temperature | 0°C to +55°C (non-condensing) |
Storage Temperature | -25°C to +70°C |
Relative Humidity | 35% to 85% RH |
Protection Rating | IP20 (front panel) |
Mounting | DIN-rail (35mm) |
Dimensions (W×H×D) | Approx. 45 × 170 × 153 mm |
Weight | Approx. 150g |
Terminal Type | Screw terminals |
Standards Compliance | CE, RoHS, UL 508 |
Detailed Function Description
Input Configuration
Each channel can be independently configured for different thermocouple types using control registers. The module supports mixed thermocouple types across channels (e.g., CH1: J-type, CH2: K-type). Configuration is done via PLC program or RS-485 communication.
Temperature Display
The dual 7-segment display shows real-time temperature values. The upper display (red) typically shows channel number or status, while the lower display (green) shows the measured temperature value. Display mode can be switched between channels.
Communication Features
- RS-485 Interface: Supports Modbus RTU and ASCII protocols
- Baud Rate: Configurable from 4800 to 115200 bps
- Address Setting: DIP switch or software configurable (0-247)
- Data Format: 16-bit signed integer (two’s complement)
Control Registers
The module contains 49 control registers (CR#0 to CR#48) for configuration and data access. Key registers include:
- CR#1: Thermocouple type selection for each channel
- CR#2-CR#5: Averaging cycles setting per channel
- CR#6-CR#9: Measured temperature values (read-only)
- CR#10-CR#13: Alarm settings and status
Self-Diagnostic Functions
- Open Circuit Detection: Detects thermocouple wire break
- Over-Range Alarm: Indicates temperature beyond sensor range
- Module Error: Indicates communication or hardware fault
- Status LEDs: Power, error, and communication status indicators
Wiring and Installation
Power Connection
- L+: Connect to 24V DC positive
- L-: Connect to 24V DC negative (0V)
- FG: Frame ground (connect to earth ground)
Thermocouple Connection
Each channel has three terminals:
- L+: Thermocouple positive (+)
- L-: Thermocouple negative (-)
- SLD: Shield connection (connect to cable shield)
Important Notes:
- Use shielded twisted-pair cables for thermocouple connections
- Keep thermocouple wiring away from power lines and noise sources
- Ensure proper grounding of shield wires
- Use appropriate thermocouple extension cables for long distances
- Follow thermocouple polarity (positive to L+, negative to L-)
DIN-Rail Mounting
- Compatible with 35mm DIN rail
- Snap-on mounting (no tools required)
- Ensure adequate ventilation space around module
- Maximum 8 modules can be connected to one PLC
Configuration and Programming
PLC Connection
The module connects to Delta DVP-S series PLCs via the expansion bus. Module address is automatically assigned based on physical position (0-7). No additional wiring required for PLC communication.
FROM/TO Instructions
Use FROM instruction to read data from module registers, TO instruction to write configuration parameters. Example ladder logic:
RS-485 Configuration
When using RS-485 communication (Modbus), configure:
- Baud rate (CR#0)
- Communication mode (ASCII/RTU)
- Module address
- Data format
Averaging Function
Each channel can be configured with averaging cycles (1-4096) to reduce noise. Higher averaging values provide smoother readings but slower response.
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for wiring and configuration
- Installation guidance and wiring diagrams
- Compatibility verification with existing systems
- Commissioning assistance available
Delivery Time
- Standard delivery: 3-5 working days (in stock items)
- Express shipping available upon request
- Custom configurations: 7-14 working days
Why Choose Our Store
- Genuine Delta components from authorized sources
- Global supply network with competitive pricing
- Expertise in industrial automation systems
- Comprehensive technical documentation
- Responsive customer service and support
Applications
- Process temperature monitoring in chemical plants
- Machine temperature control in manufacturing equipment
- HVAC systems for building automation
- Food processing temperature measurement
- Plastic injection molding machine temperature control
- Heat treatment furnaces temperature monitoring
- Laboratory equipment temperature data acquisition
- Energy management systems for temperature logging
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