Comprehensive Product Summary – EX9018 Analog Input Thermocouple Module

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### 1. Product Overview

Product Name: EX9018
Model: EX-9018
Series: EX-9000 Series Analog Input Modules
Article Number: EX9018
Manufacturer: ICP DAS / EX Series Industrial Automation Modules

The EX9018 is a high-precision, 8-channel analog input module designed for thermocouple and low-level voltage/current measurement applications. It is part of the EX-9000 series of distributed I/O modules, supporting RS-485 communication and Modbus RTU protocol for integration into industrial control and monitoring systems. The module provides 16-bit resolution, galvanic isolation, and flexible input configuration for a wide range of thermocouple types and analog signal ranges.

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### 2. Key Features

- 8 Differential Analog Input Channels: Each channel supports differential measurement for improved noise immunity and accuracy.
- High Resolution: 16-bit A/D conversion ensures precise signal acquisition.
- Thermocouple Compatibility: Supports standard thermocouple types J, K, T, E, R, S, B, and N.
- Multi-Range Analog Input: Configurable for voltage ranges of ±15mV, ±50mV, ±100mV, ±500mV, ±1V, ±2.5V, or current ±20mA (via external 125Ω resistor).
- Sampling Rate: 10 samples per second (10 Hz) with a bandwidth of 15.7 Hz.
- High Accuracy: ±0.1% of full scale with low drift characteristics (Zero Drift: 0.5 μV/°C, Span Drift: 25 ppm/°C).
- Galvanic Isolation: Input and output circuits are isolated to prevent ground loops and enhance reliability.
- RS-485 Communication Interface: Two-wire serial communication supporting baud rates from 1200 to 115200 bps.
- Modbus RTU Support (EX9018-M): Enables easy integration with PLCs, SCADA, and HMI systems.
- Thermocouple Break Line Detection (EX9018BL / EX9018BL-M): Detects open thermocouple circuits for enhanced safety and diagnostics.
- Wide Power Supply Range: Operates from +10V to +30V DC.
- Cold Junction Compensation (CJC): Built-in temperature compensation for accurate thermocouple readings.
- Dual Watchdog System: Hardware and host watchdogs ensure continuous operation and system reliability.
- EEPROM Configuration Storage: Retains settings such as address, baud rate, and input type even after power loss.
- INIT* Mode: Simplified configuration recovery mode accessible via rear switch or terminal connection.
- Compact and Robust Design: Suitable for industrial environments with wide operating temperature tolerance.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Interface | RS-485, 2-wire |
| Communication Speed (bps) | 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 |
| Analog Input Type | Differential |
| Number of Channels | 8 |
| Resolution | 16 bits |
| Input Impedance | 20 MΩ |
| Voltage Input Ranges | ±15mV, ±50mV, ±100mV, ±500mV, ±1V, ±2.5V |
| Current Input Range | ±20mA (requires external 125Ω resistor) |
| Thermocouple Types Supported | J, K, T, E, R, S, B, N |
| Sampling Rate | 10 samples/second |
| Bandwidth | 15.7 Hz |
| Accuracy | ±0.1% of full scale |
| Zero Drift | 0.5 μV/°C |
| Span Drift | 25 ppm/°C |
| Common Mode Rejection (CMR) | 150 dB @ 50/60 Hz |
| Normal Mode Rejection (NMR) | 100 dB @ 50/60 Hz |
| Power Supply | +10V to +30V DC |
| Isolation | Galvanic isolation between input and communication lines |
| Warm-up Time | 30 minutes recommended before operation |
| Operating Temperature Range | -25°C to +75°C (typical for EX series modules) |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 10–90% RH, non-condensing |
| Mounting | DIN-rail or panel mount |
| Dimensions / Weight | Compact industrial enclosure (typical EX-9000 form factor, approx. 72 x 118 x 35 mm, ~200 g) |

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### 4. Functionality

The EX9018 functions as an analog input acquisition module for temperature and low-level signal measurement. It converts thermocouple or analog voltage/current signals into digital data transmitted via RS-485 to a host controller or SCADA system.

Working Principle:
- Each thermocouple channel measures the Seebeck voltage generated by the temperature difference between the hot junction and the cold junction.
- The module applies Cold Junction Compensation (CJC) to correct for ambient temperature at the connection terminals.
- The 16-bit ADC digitizes the input signal, which is then transmitted over RS-485 using ASCII or Modbus RTU protocol.
- The module supports both engineering unit and 2’s complement hexadecimal data formats.

Use Cases and Applications:
- Industrial process temperature monitoring and control.
- Furnace, kiln, and oven temperature measurement.
- Laboratory and research instrumentation.
- Environmental and HVAC monitoring.
- Integration with PLCs, DCS, and SCADA systems for distributed temperature sensing.

Compatibility:
- Compatible with Modbus RTU master devices (PLCs, HMIs, SCADA software).
- Works with ICP DAS EX-9000 utility software for configuration.
- Supports ASCII command set for direct serial communication.

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### 5. Components & Accessories

Included Items:
- EX9018 module unit.
- User manual and configuration guide.
- Software utility for configuration (EX-9000 Utility).
- Terminal block connectors for signal and power wiring.

Optional Accessories:
- External 125Ω precision resistor (0.1%) for current measurement.
- RS-485 communication cables.
- DIN-rail mounting kit.
- Power supply (10–30V DC regulated source).
- Thermocouple extension cables and connectors.

Connectors:
- Screw-type terminal blocks for analog inputs and power.
- RS-485 communication terminals (D+, D−, GND).
- INIT* terminal or rear switch for configuration reset.

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### 6. Installation & Setup

Requirements:
- DC power supply (10–30V).
- RS-485 network connection to host controller.
- Proper grounding and shielding for noise immunity.

Mounting Options:
- DIN-rail mounting (standard).
- Panel mounting (optional).

Configuration Steps:
1. Power Off the module before wiring.
2. Connect thermocouple or analog input signals to the corresponding differential input terminals.
3. Connect RS-485 communication lines (D+, D−) to the network.
4. Apply power (10–30V DC).
5. Configure module address, baud rate, and input type using ASCII commands or EX-9000 utility.
6. For Modbus models (EX9018-M, EX9018BL-M), configure via Modbus registers.
7. Use INIT* mode (rear switch or INIT* terminal) to reset or recover configuration if necessary.

Default Settings (EX9018/18BL/19):
- Module Address: 01
- Baud Rate: 9600 bps
- Checksum: Disabled
- Filter: 60 Hz rejection
- Analog Input Type: Type 0F (Type K thermocouple)

Default Settings (EX9018-M/18BL-M/19-M):
- Protocol: Modbus RTU
- Module Address: 01
- Baud Rate: 9600 bps
- Filter: 60 Hz rejection

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### 7. Performance & Capabilities

- Speed: 10 samples per second per channel.
- Resolution: 16-bit ADC ensures fine measurement granularity.
- Accuracy: ±0.1% of full scale, suitable for precision temperature monitoring.
- Noise Rejection: 150 dB CMR and 100 dB NMR at 50/60 Hz minimize interference.
- Reliability: Dual watchdog (module and host) prevents system hang-ups.
- Thermocouple Break Detection: Available in BL and BL-M variants for fault detection.
- Cold Junction Compensation: Ensures accurate thermocouple readings across varying ambient conditions.
- Data Formats: Supports engineering units, % of full scale, and 2’s complement hexadecimal.
- Modbus Mapping: Provides direct register access for analog values, cold junction temperature, input type, and burnout status.
- Limitations:
- Warm-up time of 30 minutes recommended for optimal accuracy.
- Current measurement requires external resistor.
- Individual channel configuration supported only in EX9019 variants.

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### 8. Standards & Compliance

- Communication Protocols: ASCII and Modbus RTU compliant.
- Electrical Isolation: Meets industrial isolation standards for RS-485 and analog inputs.
- EMC Immunity: Designed for industrial environments with high noise immunity.
- Safety: Galvanic isolation and watchdog mechanisms enhance operational safety.
- Industry Standards:
- RS-485 (EIA/TIA-485) compliant.
- Modbus RTU protocol per Modicon standard.
- CE and RoHS compliance (typical for EX series modules).

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### 9. Additional Information

Variants:
- EX9018: Base model, 8-channel thermocouple/analog input.
- EX9018-M: Adds Modbus RTU protocol support.
- EX9018BL: Adds thermocouple break line detection.
- EX9018BL-M: Combines Modbus RTU and break line detection.
- EX9019 / EX9019-M: Adds individual channel configuration capability.

Firmware & Software:
- Firmware version readable via command `$AAF`.
- Configuration stored in EEPROM for non-volatile retention.
- Supports firmware updates via RS-485 interface.

Maintenance:
- Periodic calibration recommended for long-term accuracy.
- Zero and span calibration procedures available via ASCII commands.
- Avoid recalibration unless fully understood (as per manufacturer warning).

Support & Warranty:
- Manufacturer technical support available via ICP DAS documentation and online resources.
- Standard limited warranty (typically 1 year) covering manufacturing defects.
- Software utilities and manuals downloadable from manufacturer’s website.

Operational Notes:
- Allow 30 minutes warm-up before measurement for best accuracy.
- Ensure proper shielding and grounding for thermocouple wiring.
- Use INIT* mode for configuration recovery if communication settings are lost.
- Host watchdog timeout can be configured (0.1–25.5 seconds) to ensure system safety.

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### Summary

The EX9018 Analog Input Thermocouple Module is a robust, high-precision data acquisition device engineered for industrial temperature and analog signal measurement. With 8 differential channels, 16-bit resolution, and support for multiple thermocouple types, it provides exceptional flexibility and accuracy. Its RS-485 interface and Modbus RTU compatibility make it ideal for distributed control systems, while features like cold junction compensation, galvanic isolation, and dual watchdogs ensure reliable operation in demanding environments. The EX9018 and its variants (M, BL, BL-M, 9019 series) offer scalable solutions for temperature monitoring, process control, and automation applications requiring dependable and precise analog input performance.