TM3DI8

The Schneider Electric TM3DI8, also cataloged as the TM3DI8 Discrete Input Module, provides eight 24 VDC discrete inputs for Modicon M221, M241, M251, and M262 controllers through the Modicon TM3 expansion I/O bus.

Hardware Specifications

Parameter	Specification
Model	TM3DI8
Brand	Schneider Electric
Product Type	Discrete Input Module
Product Range	Modicon TM3
Compatible Controllers	Modicon M221, M241, M251, M262
Discrete Inputs	8
Input Voltage	24 VDC
Input Logic	Sink or source (positive/negative)
Input Current	7 mA
Input Impedance	3.4 kOhm
State 1 Voltage	15...28.8 VDC
State 0 Voltage	0...5 VDC
State 1 Current	>= 2.5 mA
State 0 Current	<= 1 mA
Maximum Response Time	4 ms turn-on; 4 ms turn-off
Bus Current Consumption	22 mA typical at 5 VDC; 5 mA specified in source data
Input-to-Bus Isolation	500 VAC
Channel-to-Channel Isolation	Non-isolated
Electrical Connection	Removable screw terminal block, 5.08 mm pitch
Cable Distance	Less than 30 m with unshielded cable for regular input
Local Indication	1 green LED per input channel
Mounting	TH35-15 or TH35-7.5 DIN rail per IEC 60715; plate/panel with fixing kit
Protection Rating	IP20
Dimensions	27.4 W x 84.6 D x 90 H mm
Weight	0.085 kg
Operating Temperature	-10...35 deg C vertical; -10...55 deg C horizontal
Storage Temperature	-25...70 deg C
Relative Humidity	10...95%, non-condensing
Operating Altitude	0...2000 m
Vibration Resistance	3.5 mm at 5...8.4 Hz; 3 gn at 8.4...150 Hz
Shock Resistance	15 gn, 11 ms
Standards	IEC 61131-2
Certifications	CE, CULus, UKCA, RCM, EAC, CULus HazLoc
Origin	TW
Carbon Footprint	27 kg CO2 eq.

PLC Expansion I/O and Bus Characteristics

TM3DI8 is an expansion I/O module for Modicon M221, M241, M251, and M262 controllers. The module receives power and exchanges I/O data through the internal TM3 bus connector when assembled with the controller or other TM3 modules.

The eight inputs support sink or source logic and conform to IEC 61131-2 Type 1 input characteristics. Each channel has an individual green status LED. Isolation between the input circuitry and internal logic is specified at 500 VAC, while the individual input channels are not isolated from one another.

The module uses a removable screw terminal block with a 5.08 mm pitch. The specified input cable distance for regular inputs is less than 30 m when using unshielded cable.

Frequently Asked Questions (FAQ)

Q: Can TM3DI8 accept both sinking and sourcing input configurations?
A: Yes. The eight discrete inputs support sink or source, corresponding to positive or negative logic configurations.

Q: Are the eight input channels individually isolated?
A: No. The input channels are not isolated from one another. Isolation is specified between the input circuitry and the internal bus/logic at 500 VAC.

Q: What is the maximum specified input response time?
A: The maximum response time is 4 ms for both turn-on and turn-off.

Field Installation Guidelines

• Mount TM3DI8 on a TH35-15 or TH35-7.5 DIN rail conforming to IEC 60715, or install it on a panel using the specified fixing kit.
• Engage the TM3 interlocking mechanism correctly before connecting the expansion bus.
• Use the removable screw terminal block for field input wiring and maintain correct terminal identification.
• Keep discrete input wiring separated from high-energy power conductors where practical to reduce electrical interference.
• For the specified regular-input cable arrangement, keep unshielded cable runs below 30 m.
• Do not treat the eight input channels as galvanically isolated channels because channel-to-channel isolation is not provided.
• Verify the 24 VDC field supply and input polarity before energizing the module.
• Check each channel's green LED after commissioning to confirm the corresponding input state.
• Respect the specified ambient temperature limits according to vertical or horizontal installation orientation.

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