What Is the TM3AI8 Analog Input Module?
The Schneider Electric TM3AI8 is an eight-channel analog input expansion module from the Modicon TM3 series. It converts field signals into digital values for Modicon M221, M241, M251 and M262 controllers. Because each channel is software configurable for 0-10 Vdc, ±10 Vdc, 0-20 mA or 4-20 mA, one module can replace several fixed-range input cards. Consequently, panel builders reduce spare-part inventory and wiring complexity.
TM3AI8 Key Features and Verified Specifications
- Channels: 8 analog inputs, individually configurable per channel.
- Signal ranges: 0-10 Vdc, ±10 Vdc, 0-20 mA and 4-20 mA.
- Resolution: 12 bits, with 11 bits plus sign for bipolar ranges.
- Accuracy: ±0.1% of full scale at 25 °C; ±1% FS over temperature.
- Isolation: 1500 V AC between input and supply; 500 V AC between input and internal logic.
- Supply: 24 Vdc via the TM3 bus.
- Bus current: 50 mA at 5 V DC at full load; 40 mA at 24 V DC.
- Response time: 1 ms conversion plus 1 ms per channel plus one controller cycle; 1 ms sampling per channel.
- Diagnostics: Channel status, module status and bus status.
- Protection rating: IP20.
- Operating temperature: 0 to +55 °C.
- Dimensions: 90 × 23.6 × 70 mm; weight 0.115 kg.
Power consumption data is not available; refer to the official datasheet for that figure. The 1500 V AC input-to-supply isolation is the standout value. It protects the controller from ground loops and field transients, which reduces unplanned downtime and its associated cost.
Cost and Efficiency Implications of the TM3AI8
Twelve-bit resolution at ±0.1% full-scale accuracy means fewer measurement errors in process loops. As a result, control actions stay closer to setpoint, so energy and raw material waste decline. The 1 ms conversion and 1 ms per-channel sampling keep scan-time overhead predictable. Therefore, engineers can size controller cycles without over-specifying CPU capacity. In addition, the 50 mA at 5 V DC bus load is modest, so existing power budgets often absorb the module without a supply upgrade. The removable screw terminal block at 3.81 mm pitch speeds field wiring and later channel swaps, which lowers commissioning labor cost.
Integrating the TM3AI8 into Modicon Systems
The module mounts as a TM3 expansion on Modicon M221, M241, M251 and M262 platforms. It draws 24 Vdc through the TM3 bus, so no separate field supply is needed for the module itself. Channel and bus diagnostics report through the controller, which simplifies fault tracing. For networks beyond the local bus, confirm any required gateway or connection module with the supplier before ordering. Verify current lifecycle status and availability with AutoDCSTech before purchase.
TM3AI8 FAQ
How many analog channels does the TM3AI8 provide?
The TM3AI8 provides eight analog input channels, each software configurable for voltage or current signals.
Which signal ranges does the TM3AI8 support?
It supports 0-10 Vdc, ±10 Vdc, 0-20 mA and 4-20 mA, selectable per channel in software.
What isolation does the TM3AI8 offer?
Isolation is 1500 V AC between input and supply, and 500 V AC between input and internal logic.
Which controllers accept the TM3AI8?
It is compatible with Modicon M221, M241, M251 and M262 controllers as a TM3 expansion module.
Contact AutoDCSTech with your exact requirements for precise matching.
Availability & Condition at AutoDCSTech
| Part Number | TM3AI8 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | France |
