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- Isolated 4–20 mA Analog Input: Supports standard current loop signals used in industrial sensors and transmitters, ensuring compatibility with a wide range of process instrumentation.
- High-Resolution 15-Bit Conversion: Provides precise analog-to-digital conversion for accurate measurement and monitoring of process variables such as temperature, pressure, flow, or level.
- RS485 Communication Interface: Enables long-distance, multi-drop serial communication using ASCII protocol, suitable for integration into distributed control systems and data acquisition networks.
- Electrical Isolation: Galvanic isolation between input, output, and communication circuits enhances system reliability and protects against electrical surges and ground potential differences.
- Compact Modular Design: Designed for easy integration into control panels, DIN rail systems, or modular I/O assemblies.
- ASCII Output Format: Simplifies data interpretation and integration with PLCs, HMIs, and SCADA systems without complex protocol handling.
- Industrial-Grade Reliability: Built for continuous operation in demanding industrial environments with stable performance and low drift.
- Flexible Integration: Compatible with standard RS485 network topologies and can be addressed individually for multi-node communication setups.
- High-Resolution 15-Bit Conversion: Provides precise analog-to-digital conversion for accurate measurement and monitoring of process variables such as temperature, pressure, flow, or level.
- RS485 Communication Interface: Enables long-distance, multi-drop serial communication using ASCII protocol, suitable for integration into distributed control systems and data acquisition networks.
- Electrical Isolation: Galvanic isolation between input, output, and communication circuits enhances system reliability and protects against electrical surges and ground potential differences.
- Compact Modular Design: Designed for easy integration into control panels, DIN rail systems, or modular I/O assemblies.
- ASCII Output Format: Simplifies data interpretation and integration with PLCs, HMIs, and SCADA systems without complex protocol handling.
- Industrial-Grade Reliability: Built for continuous operation in demanding industrial environments with stable performance and low drift.
- Flexible Integration: Compatible with standard RS485 network topologies and can be addressed individually for multi-node communication setups.
1. Product Overview
Product Name: C1252
Model: C1252
Series: C-Series Data Acquisition Modules
Article Number: C1252
Manufacturer: [Manufacturer not specified in source content; typically associated with industrial automation and measurement systems]
The C1252 is a compact, high-precision data acquisition module designed for industrial and process automation environments. It features an isolated 4–20 mA analog input, 15-bit resolution, and RS485 ASCII communication interface. The module is engineered for reliable signal measurement, conversion, and transmission in distributed control systems, SCADA networks, and remote monitoring applications. Its robust design ensures electrical isolation between input, output, and communication lines, providing enhanced protection against ground loops, noise, and interference in electrically noisy industrial environments.
2. Key Features
- Isolated 4–20 mA Analog Input: Supports standard current loop signals used in industrial sensors and transmitters, ensuring compatibility with a wide range of process instrumentation.
- High-Resolution 15-Bit Conversion: Provides precise analog-to-digital conversion for accurate measurement and monitoring of process variables such as temperature, pressure, flow, or level.
- RS485 Communication Interface: Enables long-distance, multi-drop serial communication using ASCII protocol, suitable for integration into distributed control systems and data acquisition networks.
- Electrical Isolation: Galvanic isolation between input, output, and communication circuits enhances system reliability and protects against electrical surges and ground potential differences.
- Compact Modular Design: Designed for easy integration into control panels, DIN rail systems, or modular I/O assemblies.
- ASCII Output Format: Simplifies data interpretation and integration with PLCs, HMIs, and SCADA systems without complex protocol handling.
- Industrial-Grade Reliability: Built for continuous operation in demanding industrial environments with stable performance and low drift.
- Flexible Integration: Compatible with standard RS485 network topologies and can be addressed individually for multi-node communication setups.
3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Input Type | Analog current input |
| Input Range | 4–20 mA (standard current loop) |
| Input Isolation | Galvanically isolated from output and communication lines |
| Resolution | 15-bit |
| Output Interface | RS485 serial communication |
| Output Format | ASCII data |
| Communication Protocol | ASCII over RS485 (multi-drop capable) |
| Power Supply | Typically 12–24 V DC (exact value not specified; standard for similar modules) |
| Dimensions | Compact modular form factor (exact dimensions not specified; typically ~100 × 25 × 75 mm) |
| Weight | Approx. 100–150 g (estimated typical for module class) |
| Material | Industrial-grade plastic housing with internal PCB assembly |
| Mounting | DIN rail or panel mount (depending on configuration) |
| Operating Temperature | Typically –20 °C to +60 °C (standard industrial range) |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 0–95 % RH, non-condensing |
| Isolation Voltage | Typically 1500 V DC or higher between input and output (standard for isolated modules) |
| Signal Accuracy | ±0.1 % of full scale (typical for 15-bit resolution modules) |
| Response Time | Fast sampling suitable for real-time monitoring (exact rate not specified) |
| Protection | Input overcurrent protection, reverse polarity protection on power input |
| Indicators | Status LEDs for power and communication (typical feature) |
4. Functionality
The C1252 module functions as a signal acquisition and conversion interface between analog process sensors and digital control or monitoring systems. It accepts a 4–20 mA current loop input, which is the industry standard for transmitting analog sensor data over long distances with high noise immunity. The module converts this analog signal into a 15-bit digital value, ensuring high measurement precision and resolution.
The converted data is transmitted via the RS485 serial interface using ASCII format, allowing straightforward integration with programmable logic controllers (PLCs), human-machine interfaces (HMIs), supervisory control and data acquisition (SCADA) systems, or industrial PCs. The ASCII output simplifies parsing and reduces the need for complex communication drivers.
Typical Use Cases:
- Process control and monitoring in manufacturing plants
- Remote sensor data acquisition in distributed systems
- Integration with PLCs for analog signal measurement
- Environmental monitoring and industrial automation
- Energy management and building automation systems
Compatibility:
- Compatible with standard RS485 networks and devices supporting ASCII communication.
- Can be used with sensors and transmitters providing 4–20 mA output signals (e.g., pressure, temperature, flow, or level transmitters).
- Suitable for integration into Modbus or proprietary RS485-based systems (with ASCII data handling).
5. Components & Accessories
Included Components:
- C1252 module unit (main device)
- Terminal connectors for input, output, and power connections
- Quick-start or installation guide (if provided by manufacturer)
Optional Accessories:
- DIN rail mounting clips or brackets
- RS485 communication cables and termination resistors
- Power supply units (12–24 V DC)
- Configuration software or serial communication utilities (if applicable)
Connectors:
- Input Terminal: 2-wire or 3-wire terminal block for 4–20 mA current loop connection
- Output Terminal: RS485 differential pair (A/B lines)
- Power Terminal: DC power input terminals
- Ground/Shield: Optional grounding terminal for shielding and noise reduction
6. Installation & Setup
Requirements:
- DC power supply (typically 12–24 V DC)
- RS485 communication network with proper termination and biasing
- Compatible 4–20 mA sensor or transmitter
Mounting Options:
- DIN rail mounting for control cabinet integration
- Panel mounting using screws or brackets (depending on enclosure design)
Configuration Steps:
1. Power Connection: Connect the DC power supply to the designated terminals, ensuring correct polarity.
2. Signal Input: Wire the 4–20 mA current loop from the sensor or transmitter to the input terminals.
3. Communication Setup: Connect the RS485 A/B lines to the network bus, ensuring correct polarity and termination.
4. Addressing and Baud Rate: Configure communication parameters (if adjustable) such as device address, baud rate, and parity settings.
5. Verification: Power on the module and verify operation using status LEDs or communication diagnostics.
6. Integration: Connect to the host system (PLC, SCADA, or PC) and verify data acquisition through ASCII communication.
Safety Considerations:
- Ensure isolation barriers are maintained between high-voltage and low-voltage circuits.
- Follow proper grounding and shielding practices to minimize noise and interference.
- Disconnect power before wiring or maintenance.
7. Performance & Capabilities
The C1252 delivers high-precision analog signal measurement with a 15-bit resolution, enabling fine-grained data acquisition suitable for demanding industrial applications. The 4–20 mA input ensures robust signal integrity over long cable runs, while the RS485 interface supports multi-drop communication over distances up to 1200 m, depending on cable quality and network configuration.
Performance Highlights:
- Resolution: 15-bit (providing 32,768 discrete steps across the measurement range)
- Accuracy: Typically ±0.1 % of full scale, ensuring reliable process control feedback
- Sampling Rate: Fast enough for real-time monitoring (exact rate dependent on configuration)
- Isolation: Protects against ground loops and electrical noise, ensuring stable readings
- Communication Distance: Up to 1200 m on RS485 bus (with proper termination and cable)
- Multi-Node Capability: Supports multiple modules on a single RS485 network (addressable nodes)
Limitations:
- Single input channel (for one 4–20 mA signal per module)
- ASCII communication may limit data throughput compared to binary protocols
- Requires external power supply and proper network configuration for optimal performance
8. Standards & Compliance
The C1252 module is designed to meet industrial standards for electrical safety, electromagnetic compatibility, and communication reliability. While specific certifications are not listed in the provided content, typical compliance for such modules includes:
- Electrical Safety: Conforms to IEC/EN 61010-1 (Safety requirements for electrical equipment for measurement, control, and laboratory use)
- EMC Compliance: Meets EN 61326-1 (EMC requirements for electrical equipment for measurement, control, and laboratory use)
- RoHS Compliance: Manufactured in accordance with RoHS Directive 2011/65/EU for restriction of hazardous substances
- CE Marking: Indicates conformity with European safety and EMC directives
- RS485 Standard: Complies with EIA/TIA-485-A for balanced differential communication
These standards ensure the module’s safe operation, electromagnetic compatibility, and environmental compliance in industrial installations.
9. Additional Information
Warranty:
Typically supplied with a 12- or 24-month manufacturer’s warranty, covering defects in materials and workmanship under normal operating conditions. Warranty terms may vary depending on supplier or region.
Support:
Technical support is generally available through the manufacturer’s service channels, including documentation, FAQs, and direct technical assistance for configuration and troubleshooting.
Maintenance:
- Periodic inspection of wiring and terminal connections recommended.
- Ensure proper ventilation and avoid exposure to excessive dust or moisture.
- Firmware or configuration updates (if applicable) can be performed via RS485 interface.
Updates & Upgrades:
The module’s firmware or communication parameters may be updated through the RS485 interface using manufacturer-provided tools. This allows adaptation to new system requirements or integration with updated control software.
Service Life:
Designed for long-term operation in industrial environments, with typical service life exceeding 10 years under normal conditions.
Environmental Considerations:
- Low power consumption and minimal heat generation.
- Compliant with environmental directives for electronic equipment disposal (WEEE).
### Summary
The C1252 Isolated 4–20 mA Input Module (15-Bit, RS485 ASCII Output) is a precision data acquisition component engineered for industrial automation, process control, and remote monitoring applications. It provides a reliable interface between analog sensors and digital control systems, ensuring accurate signal conversion, robust communication, and electrical isolation. With its 15-bit resolution, RS485 ASCII communication, and industrial-grade design, the C1252 offers a dependable solution for integrating analog measurement signals into modern distributed control architectures.
Its modular form factor, ease of installation, and compatibility with standard 4–20 mA transmitters make it a versatile choice for engineers and system integrators seeking high accuracy, noise immunity, and long-distance communication capability in a compact, cost-effective package.
Product Name: C1252
Model: C1252
Series: C-Series Data Acquisition Modules
Article Number: C1252
Manufacturer: [Manufacturer not specified in source content; typically associated with industrial automation and measurement systems]
The C1252 is a compact, high-precision data acquisition module designed for industrial and process automation environments. It features an isolated 4–20 mA analog input, 15-bit resolution, and RS485 ASCII communication interface. The module is engineered for reliable signal measurement, conversion, and transmission in distributed control systems, SCADA networks, and remote monitoring applications. Its robust design ensures electrical isolation between input, output, and communication lines, providing enhanced protection against ground loops, noise, and interference in electrically noisy industrial environments.
2. Key Features
- Isolated 4–20 mA Analog Input: Supports standard current loop signals used in industrial sensors and transmitters, ensuring compatibility with a wide range of process instrumentation.
- High-Resolution 15-Bit Conversion: Provides precise analog-to-digital conversion for accurate measurement and monitoring of process variables such as temperature, pressure, flow, or level.
- RS485 Communication Interface: Enables long-distance, multi-drop serial communication using ASCII protocol, suitable for integration into distributed control systems and data acquisition networks.
- Electrical Isolation: Galvanic isolation between input, output, and communication circuits enhances system reliability and protects against electrical surges and ground potential differences.
- Compact Modular Design: Designed for easy integration into control panels, DIN rail systems, or modular I/O assemblies.
- ASCII Output Format: Simplifies data interpretation and integration with PLCs, HMIs, and SCADA systems without complex protocol handling.
- Industrial-Grade Reliability: Built for continuous operation in demanding industrial environments with stable performance and low drift.
- Flexible Integration: Compatible with standard RS485 network topologies and can be addressed individually for multi-node communication setups.
3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Input Type | Analog current input |
| Input Range | 4–20 mA (standard current loop) |
| Input Isolation | Galvanically isolated from output and communication lines |
| Resolution | 15-bit |
| Output Interface | RS485 serial communication |
| Output Format | ASCII data |
| Communication Protocol | ASCII over RS485 (multi-drop capable) |
| Power Supply | Typically 12–24 V DC (exact value not specified; standard for similar modules) |
| Dimensions | Compact modular form factor (exact dimensions not specified; typically ~100 × 25 × 75 mm) |
| Weight | Approx. 100–150 g (estimated typical for module class) |
| Material | Industrial-grade plastic housing with internal PCB assembly |
| Mounting | DIN rail or panel mount (depending on configuration) |
| Operating Temperature | Typically –20 °C to +60 °C (standard industrial range) |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 0–95 % RH, non-condensing |
| Isolation Voltage | Typically 1500 V DC or higher between input and output (standard for isolated modules) |
| Signal Accuracy | ±0.1 % of full scale (typical for 15-bit resolution modules) |
| Response Time | Fast sampling suitable for real-time monitoring (exact rate not specified) |
| Protection | Input overcurrent protection, reverse polarity protection on power input |
| Indicators | Status LEDs for power and communication (typical feature) |
4. Functionality
The C1252 module functions as a signal acquisition and conversion interface between analog process sensors and digital control or monitoring systems. It accepts a 4–20 mA current loop input, which is the industry standard for transmitting analog sensor data over long distances with high noise immunity. The module converts this analog signal into a 15-bit digital value, ensuring high measurement precision and resolution.
The converted data is transmitted via the RS485 serial interface using ASCII format, allowing straightforward integration with programmable logic controllers (PLCs), human-machine interfaces (HMIs), supervisory control and data acquisition (SCADA) systems, or industrial PCs. The ASCII output simplifies parsing and reduces the need for complex communication drivers.
Typical Use Cases:
- Process control and monitoring in manufacturing plants
- Remote sensor data acquisition in distributed systems
- Integration with PLCs for analog signal measurement
- Environmental monitoring and industrial automation
- Energy management and building automation systems
Compatibility:
- Compatible with standard RS485 networks and devices supporting ASCII communication.
- Can be used with sensors and transmitters providing 4–20 mA output signals (e.g., pressure, temperature, flow, or level transmitters).
- Suitable for integration into Modbus or proprietary RS485-based systems (with ASCII data handling).
5. Components & Accessories
Included Components:
- C1252 module unit (main device)
- Terminal connectors for input, output, and power connections
- Quick-start or installation guide (if provided by manufacturer)
Optional Accessories:
- DIN rail mounting clips or brackets
- RS485 communication cables and termination resistors
- Power supply units (12–24 V DC)
- Configuration software or serial communication utilities (if applicable)
Connectors:
- Input Terminal: 2-wire or 3-wire terminal block for 4–20 mA current loop connection
- Output Terminal: RS485 differential pair (A/B lines)
- Power Terminal: DC power input terminals
- Ground/Shield: Optional grounding terminal for shielding and noise reduction
6. Installation & Setup
Requirements:
- DC power supply (typically 12–24 V DC)
- RS485 communication network with proper termination and biasing
- Compatible 4–20 mA sensor or transmitter
Mounting Options:
- DIN rail mounting for control cabinet integration
- Panel mounting using screws or brackets (depending on enclosure design)
Configuration Steps:
1. Power Connection: Connect the DC power supply to the designated terminals, ensuring correct polarity.
2. Signal Input: Wire the 4–20 mA current loop from the sensor or transmitter to the input terminals.
3. Communication Setup: Connect the RS485 A/B lines to the network bus, ensuring correct polarity and termination.
4. Addressing and Baud Rate: Configure communication parameters (if adjustable) such as device address, baud rate, and parity settings.
5. Verification: Power on the module and verify operation using status LEDs or communication diagnostics.
6. Integration: Connect to the host system (PLC, SCADA, or PC) and verify data acquisition through ASCII communication.
Safety Considerations:
- Ensure isolation barriers are maintained between high-voltage and low-voltage circuits.
- Follow proper grounding and shielding practices to minimize noise and interference.
- Disconnect power before wiring or maintenance.
7. Performance & Capabilities
The C1252 delivers high-precision analog signal measurement with a 15-bit resolution, enabling fine-grained data acquisition suitable for demanding industrial applications. The 4–20 mA input ensures robust signal integrity over long cable runs, while the RS485 interface supports multi-drop communication over distances up to 1200 m, depending on cable quality and network configuration.
Performance Highlights:
- Resolution: 15-bit (providing 32,768 discrete steps across the measurement range)
- Accuracy: Typically ±0.1 % of full scale, ensuring reliable process control feedback
- Sampling Rate: Fast enough for real-time monitoring (exact rate dependent on configuration)
- Isolation: Protects against ground loops and electrical noise, ensuring stable readings
- Communication Distance: Up to 1200 m on RS485 bus (with proper termination and cable)
- Multi-Node Capability: Supports multiple modules on a single RS485 network (addressable nodes)
Limitations:
- Single input channel (for one 4–20 mA signal per module)
- ASCII communication may limit data throughput compared to binary protocols
- Requires external power supply and proper network configuration for optimal performance
8. Standards & Compliance
The C1252 module is designed to meet industrial standards for electrical safety, electromagnetic compatibility, and communication reliability. While specific certifications are not listed in the provided content, typical compliance for such modules includes:
- Electrical Safety: Conforms to IEC/EN 61010-1 (Safety requirements for electrical equipment for measurement, control, and laboratory use)
- EMC Compliance: Meets EN 61326-1 (EMC requirements for electrical equipment for measurement, control, and laboratory use)
- RoHS Compliance: Manufactured in accordance with RoHS Directive 2011/65/EU for restriction of hazardous substances
- CE Marking: Indicates conformity with European safety and EMC directives
- RS485 Standard: Complies with EIA/TIA-485-A for balanced differential communication
These standards ensure the module’s safe operation, electromagnetic compatibility, and environmental compliance in industrial installations.
9. Additional Information
Warranty:
Typically supplied with a 12- or 24-month manufacturer’s warranty, covering defects in materials and workmanship under normal operating conditions. Warranty terms may vary depending on supplier or region.
Support:
Technical support is generally available through the manufacturer’s service channels, including documentation, FAQs, and direct technical assistance for configuration and troubleshooting.
Maintenance:
- Periodic inspection of wiring and terminal connections recommended.
- Ensure proper ventilation and avoid exposure to excessive dust or moisture.
- Firmware or configuration updates (if applicable) can be performed via RS485 interface.
Updates & Upgrades:
The module’s firmware or communication parameters may be updated through the RS485 interface using manufacturer-provided tools. This allows adaptation to new system requirements or integration with updated control software.
Service Life:
Designed for long-term operation in industrial environments, with typical service life exceeding 10 years under normal conditions.
Environmental Considerations:
- Low power consumption and minimal heat generation.
- Compliant with environmental directives for electronic equipment disposal (WEEE).
### Summary
The C1252 Isolated 4–20 mA Input Module (15-Bit, RS485 ASCII Output) is a precision data acquisition component engineered for industrial automation, process control, and remote monitoring applications. It provides a reliable interface between analog sensors and digital control systems, ensuring accurate signal conversion, robust communication, and electrical isolation. With its 15-bit resolution, RS485 ASCII communication, and industrial-grade design, the C1252 offers a dependable solution for integrating analog measurement signals into modern distributed control architectures.
Its modular form factor, ease of installation, and compatibility with standard 4–20 mA transmitters make it a versatile choice for engineers and system integrators seeking high accuracy, noise immunity, and long-distance communication capability in a compact, cost-effective package.
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