TM5SDI4A Modicon TM5 Digital Input Module 4DI 120–240V AC

The TM5SDI4A is a Modicon TM5 digital input module with four channels for direct monitoring of 120–240 V AC control signals.

It is suitable for AC limit switches, relay contacts, contactor auxiliary contacts and machine-status circuits where a standard 24 V DC input module cannot be used.

The module supports 1-wire or 2-wire connections and includes fixed hardware filtering plus configurable software filtering.

Its main differentiation is direct high-voltage AC signal detection without an external interposing relay for each input.

Key Features

• Four AC digital inputs
• 120–240 V AC input range
• 50/60 Hz operation
• 1-wire or 2-wire connection
• Adjustable software filtering
• 2500 V AC input-to-bus isolation
• Individual input status indication
• Designed for AC machine-control signals

Typical Applications

• Contactor status monitoring
• AC limit-switch inputs
• Relay contact feedback
• Machine power-status detection
• Industrial control cabinets

Direct AC Signal Input

TM5SDI4A accepts AC control signals directly.

Typical sources include:

• 120 V AC control circuits
• 230 V AC auxiliary contacts
• Contactor feedback contacts
• AC-powered limit switches
• Relay-operated status signals

It must not be used for 24 V DC sensors.

Input Filtering

Hardware Filter

ON transition up to 40 ms

OFF transition up to 30 ms

Software Filter

0–25 ms configurable

1 ms default

The filtering helps reject contact bounce and short AC disturbances, but the module is not intended for high-speed pulse counting.

Electrical Isolation

The four channels are not isolated from one another.

The input section is isolated from the TM5 bus electronics at 2500 V AC for one minute.

All connected channels must follow the approved common and wiring arrangement.

TM5SDI4A vs 24 V DC Input Module

TM5SDI4A

120–240 V AC inputs

Four channels

Slower AC input response

Used for AC control circuits

TM5SDI6D

24 V DC sink inputs

Six channels

Faster sensor response

Used for proximity sensors and DC switches

The two modules are not interchangeable.

Not a High-Speed Input Module

TM5SDI4A is intended for normal machine-status signals.

It should not be used for:

• Encoder pulses
• High-speed counters
• Motion feedback
• Fast product detection
• PWM signals

A dedicated high-speed counter or DC input module is required for those signals.

Required Accessories

A complete TM5 slice requires:

• TM5SDI4A electronic module
• Compatible TM5 bus base
• Suitable removable terminal block
• Approved AC wiring and protection

Confirm the included accessories before ordering.

FAQ

Q1: What is TM5SDI4A?

A1: It is a four-channel Modicon TM5 digital input module for 120–240 V AC signals.

Q2: Can it accept 24 V DC inputs?

A2: No. It is designed for AC input signals.

Q3: What frequency does it support?

A3: It supports standard 50/60 Hz AC control circuits.

Q4: Are the channels isolated from one another?

A4: No. The four input channels are not individually isolated.

Q5: Does it support input filtering?

A5: Yes. It includes fixed hardware filtering and configurable software filtering from 0 to 25 ms.

Q6: Can it count encoder pulses?

A6: No. Its AC input response is intended for standard machine-status signals, not high-speed counting.

Q7: What distinguishes it from TM5SDI6D?

A7: TM5SDI4A reads 120–240 V AC signals, while TM5SDI6D reads 24 V DC sink signals.

Q8: Does it require the TM5 24 V DC I/O power segment?

A8: No. The input section is connected to the external AC signal source.