TM3DI8G | Schneider Electric Modicon TM3 | 8-Channel Digital Input Module
The TM3DI8G brings eight 24 Vdc digital inputs to Modicon TM3 expansion racks. It uses sink/source wiring per IEC 61131-2 Type 1. Spring-cage terminals speed up field wiring. The module suits machine builders who need compact, fast digital sensing on M221, M241, M251, and M262 platforms.
Core Technical Data
- Brand: Schneider Electric
- Model: TM3DI8G
- Series: Modicon TM3
- Module type: Digital input, 8 channels
- Signal type: 24 Vdc sink/source, Type 1 per IEC 61131-2
- Voltage range: 19.2-28.8 Vdc nominal 24 Vdc
- Input current: 7 mA per channel at 24 Vdc
- Response time: 4 ms max turn-on/off
- Isolation: 500 V AC input to internal logic; no isolation between channel groups
- Diagnostics: Module status, bus status
- Wiring: Removable spring-cage terminal block, 5.08 mm pitch
- Bus current: 22 mA at 5 Vdc, all inputs off
- Supply: 24 Vdc via TM3 bus
- Operating temperature: 0 to +55 °C
- Storage temperature: -25 to +70 °C
- Protection: IP20
- Dimensions (H×W×D): 90 × 27.4 × 84.6 mm
- Weight: 0.085 kg
- Lifecycle: Active, verified 2026-09
Mounting and Commissioning Notes
- Snap the module onto the TM3 bus rail beside the controller.
- Use spring-cage terminals for tool-free, vibration-resistant wiring.
- Keep input wiring away from motor and drive cables.
- Confirm bus status LED after power-up.
- Configure input filtering in the controller software if needed.
Which Devices and Systems Use This Module
- Modicon M221, M241, M251, and M262 logic controllers
- Modicon M340 PLCs using TM3 expansion
- Packaging and labeling machines with proximity sensors
- Material handling systems with photoelectric switches
- Assembly cells with pushbuttons and limit switches
- Legacy panels needing 24 Vdc input expansion
Oiltech Controls’s Insight
- TM3DI8G fits tight panels at 27.4 mm width, saving DIN rail space.
- Spring terminals cut installation time versus screw terminals.
- 4 ms response handles most discrete sensing tasks, but not high-speed counting.
- No channel-group isolation means shared commons require careful wiring.
- Ideal for retrofit work where M221 or M241 racks need more inputs.
Why Buy From Oiltech Controls?
- Over 15 years of industrial automation spare parts experience
- Worldwide shipping through FedEx, UPS, and DHL
- Tested surplus and refurbished options available
- 12-month warranty on every module
- Technical check before dispatch
- Support for discontinued and obsolete control systems
Email info@oiltechcontrols.com or WhatsApp +86 158 8020 0923 for stock and lead time.
FAQ
Q: Can I use TM3DI8G with both sink and source sensors?
A: Yes. The module supports sink and source wiring per IEC 61131-2 Type 1. You choose the common connection based on your sensor output type. This flexibility helps when mixing PNP and NPN devices in one panel.
Q: How fast does the TM3DI8G respond to an input change?
A: Turn-on and turn-off response is 4 ms maximum. That speed covers pushbuttons, limit switches, and standard proximity sensors. For high-speed counting or encoder pulses, choose a dedicated high-speed input module instead.
Q: Does the TM3DI8G work with Modicon M340 PLCs?
A: Yes. The module operates as a TM3 expansion module for M340 PLCs. It also works with M221, M241, M251, and M262 controllers. Always verify bus compatibility and firmware level before ordering.
Q: What wiring does the spring terminal block accept?
A: The removable spring-cage block uses 5.08 mm pitch. It accepts solid and stranded wire, typically 0.2 to 1.5 mm². Push the wire in without a screwdriver. This saves time during commissioning and reduces loose-wire faults.
Q: How do I choose between new, surplus, and refurbished TM3DI8G units?
A: New units suit warranty-critical projects. Surplus units offer lower cost with tested functionality. Refurbished units pass our bench verification before shipment. All options include a 12-month warranty. Tell us your budget and timeline, and we will recommend the right option.
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