Delta AH04AD-5A 4-Channel Analog Input Module

Product Overview

The AH04AD-5A (AH04AD 5A) is a high-density, 16-bit analog-to-digital conversion module designed for the Delta AH Series PLC system. Featuring 4 high-precision input channels, this module is engineered for high-end process automation applications such as chemical refining, precision temperature monitoring, and complex hydraulic pressure control. The AH04AD-5A offers an isolated signal design to ensure data integrity in electrically noisy industrial environments and supports hot-swapping, allowing for module replacement without shutting down the entire system. By providing a conversion speed of 150 microseconds per channel, it delivers the rapid data acquisition required for high-speed deterministic control loops.

Technical Configuration

The AH04AD-5A is characterized by its versatility in signal handling, supporting a comprehensive range of bipolar and unipolar voltage/current inputs (including +/- 10 V, 0-10 V, and 4-20 mA). The hardware utilizes a 16-bit resolution to provide 65,536 increments across the signal range, ensuring that even the smallest process fluctuations are captured. The module includes integrated diagnostic functions and LED status indicators, enabling maintenance engineers to quickly identify channel faults or signal overflows. Additionally, the inclusion of a JIS removable terminal block simplifies field wiring and reduces maintenance time during system upgrades.

Technical Specifications

Technical FAQs

Does the AH04AD-5A support hot-swapping in a live system?

Yes. The AH Series architecture allows the AH04AD-5A to be removed and replaced while the PLC remains powered. This is a critical feature for "zero-downtime" facilities where process interruptions must be avoided.

How does the "Interrupt function" benefit my control logic?

The interrupt function allows the module to trigger a specific task in the AH PLC CPU immediately when a signal crosses a predefined threshold or when conversion is complete. This is significantly faster than waiting for the standard PLC scan cycle, making it ideal for safety-critical monitoring.

What is the difference between Base Error and Full Temperature Range Error?

The Base Error (+/- 0.1 percent) is measured at a stable ambient temperature (typically 25 deg C). The Full Temperature Range Error (+/- 0.45 percent for voltage) accounts for thermal drift as the control cabinet heats up, providing a realistic expectation of accuracy in extreme industrial environments.

Engineering & Installation Guide

• Wiring and Signal Isolation: To maximize the benefits of the 16-bit resolution, use shielded twisted-pair cables for all analog inputs. Connect the cable shield to the ground terminal on the module or the system earth bar. Ensure that high-voltage power lines are routed at least 200 mm away from these signal cables to prevent inductive noise.

• Terminal Block Torque: When securing wires to the JIS removable terminal block, ensure the screws are tightened to the specified torque (typically 0.5 Nm to 0.8 Nm). Over-tightening can damage the terminal housing, while loose connections will result in erratic signal readings or "chatter" in the process image.

• Mode Configuration: Use the Delta AH software utility to configure each channel individually for its specific signal type (e.g., 4-20 mA vs +/- 10 V). Ensure the physical jumpers (if applicable) and software settings match before applying the field signal to prevent hardware damage.