MOOG QAIO 16/4 Analog I/O Module Technology Analysis and Application Guide

Guidelines for Shielding, Wiring, and Practical Applications

1. Implementation of Electromagnetic Compatibility (EMC)

The high precision and fast conversion rate of the module make it sensitive to electromagnetic interference. To ensure performance, users must implement effective blocking measures.

Cabinet requirements: Modules must be installed in metal shielded cabinets.

Wiring separation: Signal lines should be spatially separated from interference sources such as power lines.

Shielding layer connection: The shielding layer of the on-site cable should be grounded on both sides of the cabinet and make extensive contact with the metal surface when entering the cabinet to achieve optimal discharge of high-frequency interference.

Design concept: The manufacturer emphasizes that although module design focuses on EMC, a large part of the responsibility for reliable system operation lies in the overall installation design of the user. Therefore, the module itself has not been affixed with the CE mark, and the user is responsible for CE compliance of the entire application system.

2. Principle of Analog Signal Wiring

The analog circuit design of the module is based on the concept of "common potential island".

Public Ground (AGND): It is strongly recommended that all connected sensors, actuators, and modules use the same 24V power supply to make AGND the common reference point of the system.

Common mode range limitation: Each analog channel is allowed to be connected to different ground potentials, but it must be ensured that the potential difference is within the common mode voltage range of ± 2V. Exceeding this range will result in measurement errors or even module damage.

Fault current protection: Despite internal protection, incorrect wiring, power supply, or high potential difference may still cause permanent damage. Before powering on, the polarity of the wiring must be checked repeatedly.

3. Example of Sensor Connection

The manual provides three typical connection methods:

Floating sensor: Use dual core shielded wires to connect IN+and AGND. Unused IN input terminals must be bridged to AGND to release the common mode voltage accumulated due to high input impedance and avoid random measurement errors.

Non isolated sensors with auxiliary power supply: The sensor must use the same power supply as the module. Signal connection IN+and IN - (polarity correct), AGND suspended. It is necessary to ensure effective potential balancing through public power sources.

Sensors that use internal reference voltage, such as potentiometers or bridge circuits, are connected to IN+, IN -, Uref, and AGND using 3-core or 4-core shielded wires. Ensure that the reference voltage source is not overloaded.

4. actuator connection

For analog output, in addition to signal lines (OUT) and analog ground (AGND), SENSE connection points are also provided. The SENSE line should be directly connected to the local ground of the actuator to compensate for the ground potential offset on the long cable, provided that the offset | U-REF | is less than 2V. Note: The SENSE line cannot be used alone as feedback.

System integration and software operation

Module identification and initialization: automatically completed by the operating system of the upstream unit controller, without the need for dip switch settings. The identification feature codes stored in the module are read by the controller.

Data conversion: Measurement and data transmission are controlled through an API (Application Process Interface) loop. AD conversion does not require a startup signal.

Data format: Analog values are passed as 16 bit integers. When the range is exceeded, the input channel will report a fixed limit value (+32752 corresponds to+9.995V, -32768 corresponds to -10.000V).

Sensor fault detection: When a sensor fails, the corresponding channel will report a value of+9.995V to the controller.

Software dependency: Specific operations (such as calling function blocks, setting sampling periods) depend on the software environment used (such as CP1131 or CPC++), and should refer to the corresponding programming manual.

Installation, maintenance, and service

Installation: Ensure that all ventilation openings are unobstructed. All power sources (including externally powered sensors) must be disconnected during work.

Maintenance: The module is maintenance free. Only dry, lint free cloths should be used for cleaning, and the use of cleaning agents is prohibited.

Repair: Users are strictly prohibited from repairing on their own. All repair work must be carried out by the manufacturer or its authorized service engineer, otherwise the warranty will be invalidated.

Scrap disposal: After the product lifecycle ends, it can be returned to the manufacturer for professional recycling at a fee.