Schneider TM3AI8 Analog Input Module

Description

The Schneider Electric TM3AI8 is an eight-channel analog input module built for Modicon M221, M241, M251, and M262 controllers. It expands existing PLC platforms with reliable voltage and current measurement capabilities, ensuring stable signal acquisition in demanding machine-control environments. Engineers value this module because it handles mixed analog ranges and maintains excellent accuracy across a wide temperature span. Moreover, the TM3AI8 integrates seamlessly with EcoStruxure Machine Expert, which simplifies commissioning and reduces programming time. Its compact design, removable terminals, and strong EMC performance make it a dependable choice for OEMs and system integrators.

Key Features and Benefits

• Eight analog channels support current and voltage signals for flexible sensor integration.

• High-resolution 12-bit conversion delivers consistent measurement stability.

• Moreover, fast sampling and short conversion times improve control loop responsiveness.

• Internal isolation protects both PLC and field instrumentation from electrical disturbances.

• Removable screw terminals allow quick field wiring and simplified maintenance.

• The module installs directly on DIN rail without extra accessories, therefore reducing panel-build effort.

• Strong EMC immunity ensures reliable operation in industrial electrical environments.

Technical Specifications

General

• Product range: Modicon TM3

• Module type: Analog input module

• Compatible PLCs: M221, M241, M251, M262

• Number of inputs: 8

Input Types

• Voltage: 0…10 V, –10…10 V

• Current: 0…20 mA, 4…20 mA

Performance

• Resolution: 12 bits / 11 bits + sign

• LSB values:

• 2.44 mV (0…10 V)

• 4.88 mV (–10…10 V)

• 4.88 µA (0…20 mA)

• 3.91 µA (4…20 mA)

• Accuracy: ±1% FS, ±0.2% FS at 25°C

• Temperature drift: ±0.01% FS/°C

• Conversion time: 1 ms + 1 ms per channel + 1 controller cycle

• Sampling duration: 1 ms

• Crosstalk: ≤1 LSB

Electrical

• Supply voltage: 24 VDC (20.4…28.8 V)

• Current consumption:

• 5 V bus: 35 mA (no load) / 40 mA (full load)

• 24 V external: 30 mA (no load) / 40 mA (full load)

• Input impedance: ≤50 Ω (current), ≥1 MΩ (voltage)

• Isolation:

• Input to supply: 1500 VAC

• Input to internal logic: 500 VAC

Environmental

• Operating temperature: –10…55°C (horizontal), –10…35°C (vertical)

• Storage temperature: –25…70°C

• Humidity: 10…95% non-condensing

• Protection rating: IP20

• Vibration: 3.5 mm (5…8.4 Hz), 3 g (8.4…150 Hz)

• Shock: 15 g, 11 ms

• Certifications: CE, UKCA, RCM, EAC, cULus, HazLoc

Mechanical

• Mounting: DIN Rail TH35-15 / TH35-7.5, or panel mounting

• Dimensions: 23.6 × 70 × 90 mm

• Weight: 0.11 kg

Typical Applications

The TM3AI8 fits a broad range of machine-automation tasks involving mixed-signal acquisition. Packaging lines rely on it for analog feedback from drives, pressure transmitters, and flow sensors. Moreover, it performs well in HVAC control, water treatment systems, and small process-control platforms that require multi-range analog measurement. OEMs often choose this module because it supports both voltage and current sensors without requiring external signal converters.

Support and Reliability

Schneider Electric designs the TM3 platform for long-term industrial use, ensuring dependable operation throughout the lifecycle of the machine. The module withstands high-noise electrical environments, and its strong EMC compliance reduces troubleshooting time. In addition, the removable terminal blocks streamline field replacement, which minimizes downtime during upgrades or service work.

FAQ

Q1: Can the TM3AI8 handle both current and voltage signals on the same module?
Yes, each channel supports selectable 0–10 V, –10–10 V, 0–20 mA, or 4–20 mA input ranges.

Q2: Does it require a separate power supply?
The module draws power from the PLC bus but also requires a 24 VDC external supply for full-load operation.

Q3: Can it be used with Modicon M262 controllers?
Yes, the module is fully compatible with M221, M241, M251, and M262 platforms.

Q4: What software is recommended for configuration?
EcoStruxure Machine Expert provides an intuitive environment for setup, diagnostics, and application programming.

Q5: Does the module include isolation?
Yes, it includes isolation between inputs, supply, and internal logic for improved signal integrity.