TM5SAI4PH Modicon TM5 RTD Input Module 4AI PT100 PT1000 16-Bit

The TM5SAI4PH is a Modicon TM5 analog input module for direct PT100 and PT1000 resistance temperature sensor measurement.

It provides four RTD input channels with 16-bit conversion and 0.1°C temperature value resolution.

Unlike the TM5SAI6TH thermocouple module, the TM5SAI4PH measures resistance variation from PT100 or PT1000 sensors. It is suited to stable temperature monitoring in machinery, heating systems and process equipment.

The module can also operate in resistance-measurement mode and provides diagnostic information for wire break and values outside the configured range.

The published sensor temperature range refers to the temperature measured by the RTD probe. It does not describe the ambient temperature around the TM5 electronic module.

Key Features

• Four RTD temperature inputs
• Supports PT100 and PT1000 sensors
• 16-bit conversion
• 0.1°C temperature value resolution
• Temperature or resistance measurement
• Wire-break diagnostics
• Shielded cable support
• Compact TM5 slice format

Typical Applications

• Mold temperature monitoring
• Packaging-machine heaters
• Process tanks
• HVAC equipment
• Industrial heating systems

PT100 and PT1000 Inputs

The TM5SAI4PH accepts PT100 and PT1000 resistance temperature detectors.

PT100

Nominal resistance of 100 Ohm at 0°C.

PT1000

Nominal resistance of 1000 Ohm at 0°C.

The configured sensor type must match the connected probe.

Temperature and Resistance Modes

The module supports two measurement modes:

Temperature Measurement

Converts the RTD resistance into a temperature value.

Resistance Measurement

Reports the measured resistance directly.

Resistance mode is useful for sensor testing, custom scaling and diagnostic applications.

Measurement Range

The supported RTD temperature range is approximately:

-200 to 850°C

This is the supported sensor measurement range, not the ambient operating temperature of the module.

The RTD probe may be installed in the process, while the TM5SAI4PH remains inside an approved electrical cabinet.

16-Bit Conversion

The module uses 16-bit analog conversion.

Temperature Value Resolution

0.1°C

The 0.1°C value is the reported resolution, not guaranteed total system accuracy.

Actual accuracy also depends on:

• RTD tolerance class
• Cable resistance
• Wiring method
• Sensor installation
• Ambient temperature
• Electrical interference

Wire-Break Diagnostics

The module can identify abnormal channel conditions such as:

• Broken sensor wire
• Value below lower limit
• Value above upper limit
• Invalid measurement

The controller program should respond safely when a temperature input becomes invalid.

Channel Isolation

The four input channels are not electrically isolated from one another.

The module provides specified isolation between the input electronics and the TM5 bus electronics.

Where sensors are installed at different electrical potentials, additional isolation may be required.

Shielded Cable

Shielded sensor cable is recommended for reliable measurement.

RTD wiring should be routed separately from:

• Motor power cables
• Heater power wiring
• Contactors
• Variable-speed drives
• High-current conductors

TM5SAI4PH vs TM5SAI6TH

TM5SAI4PH

Four PT100/PT1000 inputs

Measures resistance

Best suited to RTD sensors

TM5SAI6TH

Six J/K/N/S thermocouple inputs

Measures millivolt signals

Best suited to thermocouples

These modules are not interchangeable.

TM5SAI4PH vs Standard Analog Input

TM5SAI4PH

Direct RTD sensor input

Temperature linearization included

Supports resistance measurement

Standard Analog Input Module

Accepts signals such as 0–10 V or 4–20 mA

Requires a separate temperature transmitter

The connected sensor type determines the correct module.

Required Accessories

A complete installed slice normally includes:

TM5SAI4PH Electronic Module

TM5ACBM11 or TM5ACBM15 Bus Base

TM5ACTB12 Terminal Block

Confirm whether the base and terminal block are included before ordering.

Replacement Identification

Correct Model Number

TM5SAI4PH

Input Type

PT100 or PT1000 RTD

Input Channels

4

Resolution

16-Bit

Before replacement, confirm:

• Exact model number
• Sensor type
• Wiring method
• Channel assignments
• Bus base
• Terminal block
• Controller configuration
• Alarm limits
• Shield grounding

FAQ

Q1: What is TM5SAI4PH?

A1: It is a four-channel Modicon TM5 analog input module for PT100 and PT1000 RTD sensors.

Q2: Does it support thermocouples?

A2: No. Thermocouples require a module such as TM5SAI6TH.

Q3: Can it accept 4–20 mA signals?

A3: No. It is intended for RTD resistance sensors.

Q4: What is the conversion resolution?

A4: It uses 16-bit conversion.

Q5: What is the temperature value resolution?

A5: The reported resolution is 0.1°C.

Q6: Are the channels individually isolated?

A6: No. The four inputs are not isolated from one another.

Q7: Can it measure resistance directly?

A7: Yes. It supports both temperature and resistance measurement modes.

Q8: Does it detect broken sensor wires?

A8: Yes. Channel diagnostics include wire-break and out-of-range conditions.