Product Description – Schneider TM3AI4 Analog Expansion Module

The Schneider TM3AI4 is a high-precision analog input expansion module for Modicon PLCs, including M221, M241, M251, and M262 series. It provides 4 analog inputs with 12-bit resolution plus sign and 11-bit effective resolution, allowing precise measurement of voltage or current signals. Moreover, its compact DIN-rail mounted design ensures easy integration into existing control systems, while removable screw terminals simplify wiring and maintenance.

Designed to handle industrial standard signals (0–10 V, 0–20 mA, or 4–20 mA), this module is ideal for applications such as variable speed drives, analog sensors, and process monitoring. Its isolation of 500 V between inputs and logic and 1500 V between inputs and supply guarantees safe operation in demanding environments. Therefore, the TM3AI4 module is suitable for packaging, HVAC, pumping, and other industrial systems requiring precise analog monitoring.

Technical Specifications

Electrical & I/O

• Supply Voltage: 24 V DC (via PLC backplane bus)

• Number of Inputs: 4 analog inputs

• Input Types: Voltage 0–10 V DC / Current 0–20 mA or 4–20 mA

• Resolution: 12 bits (+ sign), 11-bit effective

• Input Impedance: Voltage ≥ 100 kΩ, Current 250 Ω

• Accuracy: ±0.5% full scale (typical)

• Isolation: 500 V between input channels and logic, 1500 V AC between inputs and supply

Performance

• Conversion Time: 1 ms per channel

• Sampling Rate: Up to 1 kHz depending on PLC configuration

• Diagnostics: LED indicators for module status

Mechanical

• Mounting: DIN-rail or plate/panel with fixing kit

• Dimensions (W × H × D): 23.6 × 90 × 70 mm

• Weight: 0.11 kg

• Connection: Removable screw terminals

• Protection: IP20

Communication & Integration

• Interface: TM3 expansion bus (direct plug-in to base PLC)

• Compatible Controllers: Modicon M221, M241, M251, M262

• Configuration: Managed via EcoStruxure Machine Expert software

Environmental & Compliance

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: −20 °C to +70 °C

• Relative Humidity: 5–95% non-condensing

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

• ESD Protection: 8 kV air, 4 kV contact (IEC 61000-4-2)

• EMC Resistance: Up to 9.1 V/m, 80 MHz–1 GHz (IEC 61000-4-3)

• Sustainability: RoHS and REACh compliant

FAQ

Q1: How many analog inputs does the TM3AI4 provide?
It offers 4 high-precision analog input channels configurable for voltage or current.

Q2: What signal types are supported?
Standard industrial signals are supported: 0–10 V, 0–20 mA, and 4–20 mA.

Q3: Is the module compatible with my Modicon PLC?
Yes, it is compatible with M221, M241, M251, and M262 PLCs.

Q4: How is the module mounted?
It mounts on a DIN rail or can be installed on a panel with a fixing kit.

Q5: Does it have any diagnostic features?
Yes, LED indicators provide status and fault information for easy troubleshooting.