Comprehensive Product Summary – EX9024‑M / EX9024H‑M 4‑Channel 14‑bit Analog Output Modbus Module

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### 1. Product Overview

Product Name: EX9024‑M / EX9024H‑M
Model Number: EX9024‑M (standard), EX9024H‑M (enhanced version with digital inputs)
Series: EX9000 Series Distributed I/O Modules
Article Number: EX9024‑M
Manufacturer: ICP DAS / EX Industrial Automation (OEM branding may vary)

The EX9024‑M is a high‑precision, 4‑channel analog output module designed for industrial automation and process control systems using the Modbus‑RTU communication protocol over RS‑485. It provides flexible voltage and current output ranges with 14‑bit resolution and robust isolation, making it suitable for demanding environments. The enhanced EX9024H‑M variant integrates four isolated digital inputs for interlock and emergency latch functions, providing additional safety and control capabilities.

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### 2. Key Features

- 4 Independent Analog Output Channels: Each channel can be configured individually for voltage or current output.
- High Resolution: 14‑bit digital‑to‑analog conversion ensures fine output granularity and precise control.
- Multi‑Range Output Support:
- Voltage: 0–5 V, ±5 V, 0–10 V, ±10 V
- Current: 0–20 mA, 4–20 mA
- Programmable Slew Rate Control: Adjustable output slope from 0.0625 V/s to 1024 V/s or 0.125 mA/s to 2048 mA/s for smooth transitions and reduced mechanical stress in actuators.
- Dual Watchdog System: Hardware (module) and software (host) watchdogs ensure continuous operation and fail‑safe behavior.
- Safe Value and Power‑On Value: User‑definable output states for startup and communication failure conditions.
- Wide Power Supply Range: Operates from +10 VDC to +30 VDC with typical consumption of 2–2.4 W.
- High Isolation: 3000 VDC isolation between I/O and communication circuits; 3750 Vrms isolation for digital inputs (EX9024H‑M).
- Extended Temperature Range: Reliable operation from −25 °C to +75 °C.
- Communication Protocols: Supports both ASCII and Modbus‑RTU over RS‑485 (2‑wire).
- Flexible Baud Rates: Selectable from 1200 bps up to 115.2 kbps.
- EEPROM Configuration Storage: Retains address, baud rate, output type, and other parameters through power cycles.
- INIT* Mode: Hardware switch or pin for restoring default communication settings and reconfiguration.
- LED Indicators: Provide visual feedback for power, communication, and channel status.
- Compact Modular Design: DIN‑rail mountable for distributed I/O systems.

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### 3. Technical Specifications

Analog Output Section
- Channels: 4 independent analog outputs
- Resolution: 14 bits (1 part in 16,384)
- Output Ranges:
- Voltage: 0–5 V, ±5 V, 0–10 V, ±10 V
- Current: 0–20 mA, 4–20 mA
- Accuracy:
- Voltage output: ±0.2 % of full‑scale range (FSR)
- Current output: ±0.1 % of FSR
- Zero Drift:
- Voltage output: ±30 µV/°C
- Current output: ±0.2 µA/°C
- Span Temperature Coefficient: ±25 ppm/°C
- Load Resistance: External 24 V / 1050 Ω maximum for current output
- Overvoltage Protection: ±35 V
- Isolation Voltage: 3000 VDC between I/O and system
- Output Update Rate: ~100 conversions per second

Digital Input Section (EX9024H‑M only)
- Channels: 4 isolated digital inputs (single‑ended with common source)
- Logic Levels:
- Logic 0: ≤ +1 V
- Logic 1: +10 V – +30 VDC
- Isolation: 3750 Vrms
- Function: Emergency latch / interlock inputs for safety control

Communication Interface
- Type: RS‑485, 2‑wire half‑duplex
- Supported Protocols: ASCII and Modbus‑RTU
- Baud Rates: 1200, 2400, 4800, 9600, 19.2 k, 38.4 k, 57.6 k, 115.2 k bps
- Default Settings:
- Address: 01
- Baud Rate: 9600 bps
- Protocol: Modbus‑RTU
- Checksum: Disabled
- Output Type: 0–10 V
- Slew Rate: Immediate

Power Requirements
- Input Voltage: +10 VDC – +30 VDC
- Power Consumption: 2.0 W (EX9024‑M), 2.4 W (EX9024H‑M)

Environmental
- Operating Temperature: −25 °C – +75 °C
- Storage Temperature: −40 °C – +85 °C
- Humidity: 10 % – 90 % RH, non‑condensing

Isolation & Protection
- I/O to system isolation: 3000 VDC
- Digital input isolation: 3750 Vrms
- Surge and transient protection on communication lines

Physical Characteristics
- Mounting: DIN‑rail or panel mount
- Enclosure: Industrial‑grade plastic housing
- Dimensions: Approx. 72 mm (W) × 118 mm (H) × 39 mm (D)
- Weight: ~200 g

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### 4. Functionality

The EX9024‑M operates as a distributed analog output node on an RS‑485 Modbus network. Each of its four channels can independently output either voltage or current signals, configurable via software commands. The module converts digital commands from the host controller into precise analog signals suitable for driving actuators, control valves, indicators, or other analog devices.

Use Cases and Applications:
- Industrial process control (temperature, pressure, flow regulation)
- Building automation (HVAC, lighting control)
- Machine control and motion systems
- Laboratory instrumentation and test benches
- SCADA and DCS systems requiring analog signal generation
- Remote I/O expansion for PLCs and embedded controllers

Compatibility:
- Fully compatible with Modbus‑RTU masters such as PLCs, HMIs, SCADA software, and industrial PCs.
- Can be integrated with other EX9000 series modules for mixed analog/digital I/O systems.
- Supports both ASCII command mode (for configuration and diagnostics) and Modbus‑RTU mode (for runtime operation).

Operation Principle:
Digital commands received via RS‑485 are decoded by the internal microcontroller, which drives a 14‑bit DAC per channel. The output is filtered and isolated before being presented at the terminal block. Slew rate control ensures gradual transitions, preventing sudden jumps that could damage connected equipment.

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### 5. Components & Accessories

Included Items:
- EX9024‑M or EX9024H‑M module
- Removable terminal block connectors for power, communication, and I/O
- Quick start guide or user manual

Optional Accessories:
- RS‑485 communication cables and converters (USB‑to‑RS‑485, Ethernet‑to‑RS‑485)
- DIN‑rail mounting clips and end brackets
- External 24 VDC power supply
- Configuration utility software (EX9000 Utility)

Connectors:
- Power Input: +10 V – +30 VDC terminal
- RS‑485: D+ / D− terminals
- Analog Outputs: AO0–AO3 terminals (voltage/current selectable)
- Digital Inputs (EX9024H‑M): DI0–DI3 terminals with common ground

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### 6. Installation & Setup

Requirements:
- RS‑485 network connection with proper termination and biasing resistors
- 10–30 VDC regulated power supply
- Host controller or PC with Modbus‑RTU or ASCII communication capability

Mounting Options:
- Standard 35 mm DIN‑rail mounting
- Panel mounting via optional brackets

Configuration Procedure:
1. Power Connection: Connect +V and GND to a 10–30 VDC source.
2. Communication Wiring: Connect RS‑485 D+ and D− lines to the network bus.
3. INIT* Mode (if needed):
- Slide the INIT* switch to “Init” or short INIT* pin to GND.
- Power on to enter configuration mode (default address = 00, baud = 9600 bps).
- Use ASCII commands to set address, baud rate, checksum, and protocol.
- Return switch to “Normal” and power cycle to apply settings.
4. Analog Output Configuration:
- Set output type (voltage/current) and range using command `$AA9NTTSS`.
- Define slew rate, power‑on value, and safe value as required.
5. Calibration (if necessary):
- Warm up module for 30 minutes.
- Perform 0 mA/−10 V and 20 mA/+10 V calibration using `$AA0N` and `$AA1N` commands.
- Trim output with `$AA3NVV` for fine adjustment.
6. Integration:
- Connect analog outputs to target devices (observe polarity and load limits).
- Verify communication and output response via Modbus registers or ASCII commands.

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### 7. Performance & Capabilities

- Output Resolution: 14 bits (1 LSB ≈ 0.61 mV or 1.22 µA depending on range)
- Update Rate: ~100 Hz per channel
- Slew Rate Control: Programmable from immediate to 1024 V/s or 2048 mA/s
- Load Capacity: Up to 1050 Ω at 24 V for current outputs
- Accuracy: ±0.1 % FSR (current), ±0.2 % FSR (voltage)
- Isolation: 3000 VDC (I/O to system), 3750 Vrms (DI isolation)
- Reliability Features:
- Dual watchdog (module + host)
- EEPROM‑stored configuration
- Safe and power‑on values for predictable behavior
- Emergency input interlock (EX9024H‑M)
- Limitations:
- No internal A/D feedback for true analog readback (digital echo only)
- Requires external power for current loop loads
- Calibration should only be performed by qualified personnel

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### 8. Standards & Compliance

- Communication Standard: Modbus‑RTU (EIA‑485 compliant)
- Electrical Isolation: IEC 61010‑1 compliant design principles
- EMC Compliance: Designed for industrial environments with surge and noise immunity
- Safety: Dual watchdog and emergency input functions enhance system safety
- RoHS / CE: Typically compliant (verify per manufacturer’s declaration)

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### 9. Additional Information

Warranty:
Standard manufacturer warranty (typically 1 year) covering defects in materials and workmanship under normal use.

Technical Support:
- Configuration utilities and manuals available from manufacturer’s website.
- Support for Modbus mapping, ASCII command reference, and firmware updates.

Maintenance:
- Periodic verification of calibration recommended for precision applications.
- Keep terminals clean and ensure proper grounding to maintain signal integrity.
- Firmware version can be read via `$AAF` command (e.g., R1.4).

Firmware & Updates:
- Firmware stored in non‑volatile memory; updates may be available for enhanced Modbus functions.
- Module name and address can be customized using `$AAM` and `~AAO(Data)` commands.

Modbus Register Mapping (Summary):
- 40001–40004: Current analog output values (channels 0–3)
- 40193–40196: Power‑on values
- 43001–43004: Safe values
- 40257–40260: Output type codes
- 40289–40292: Slew rate settings
- 40485: Module address
- 40486: Baud rate
- 40489: Host watchdog timeout value
- 02241–02244: Emergency input enable flags (EX9024H‑M)
- 10033–10036: Emergency input status bits

Host Watchdog Operation:
- Configurable timeout from 0.1 s to 25.5 s (1–255 counts).
- If timeout occurs, outputs revert to predefined Safe Values.
- Host can periodically send “Host OK” command (`~` or Modbus 0x03/0x04 function) to reset timer.

Emergency Input Function (EX9024H‑M):
- Each DI channel can be enabled as an emergency interlock for its corresponding AO channel.
- When active (logic low), the associated AO channel immediately switches to its Safe Value.

Calibration Notes:
- Perform only after full warm‑up.
- Use precision meters for 0 mA/−10 V and 20 mA/+10 V calibration points.
- Save calibration parameters to EEPROM using `$AA0N` and `$AA1N`.

Firmware Identification:
- Command `$AAF` returns firmware version (e.g., R1.4).
- Command `$AAM` returns module name (e.g., 9024).

Default Configuration Summary:
| Parameter | Default Value |
|------------|----------------|
| Address | 01 |
| Baud Rate | 9600 bps |
| Protocol | Modbus‑RTU |
| Checksum | Disabled |
| Output Type | 0–10 V |
| Slew Rate | Immediate |
| Power‑On Value | 0 V |
| Safe Value | 0 V |

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### Summary

The EX9024‑M and EX9024H‑M** modules are versatile, high‑accuracy analog output devices engineered for industrial automation networks using Modbus‑RTU over RS‑485. With four independently configurable 14‑bit outputs, programmable slew rate control, and robust isolation, they deliver precise and reliable analog signal generation for a wide range of control and monitoring applications. The enhanced EX9024H‑M adds four isolated digital inputs for emergency interlock functionality, improving system safety and flexibility.

Their combination of configurable output ranges, dual watchdog protection, EEPROM‑based configuration retention, and wide operating temperature range makes them ideal for distributed control systems, SCADA environments, and any application requiring dependable analog output performance in harsh industrial conditions.