6ES7288-3AT04-0AA0 S7-200 SMART TC Module

Siemens 6ES7288-3AT04-0AA0: SIMATIC S7-200 SMART EM AT04 Thermocouple Input Module

The Siemens 6ES7288-3AT04-0AA0 (Expansion Module EM AT04) is a precise 4-channel analog thermocouple input module designed for the SIMATIC S7-200 SMART PLC family. Built specifically for high-accuracy temperature monitoring, this module enables direct connection of standard thermocouples to measure thermal processes across industrial automation applications.

Featuring 16-bit resolution, cold junction compensation, and built-in noise filtering, the EM AT04 delivers reliable, high-precision temperature data acquisition for heat treatment systems, ovens, plastic injection machinery, and chemical processing equipment.

Key Technical Specifications

• Part Number: 6ES7288-3AT04-0AA0 (MLFB: 6ES7288-3AT04-0AA0)

• Product Series: SIMATIC S7-200 SMART

• Module Type: Thermocouple Analog Input Module (EM AT04)

• Number of Inputs: 4 analog channels dedicated to thermocouples

• Supported Thermocouple Types: J, K, T, E, R, S, N, B, and millivolt range (±80 mV)

• Resolution: 16 bits (including sign)

• Cold Junction Compensation: Integrated internal sensor or external reference

• Isolation: 500 V AC field-to-logic isolation

• Diagnostic LEDs: Operational status and channel error indicators

• Dimensions (W x H x D): 45 mm x 100 mm x 81 mm

• Weight: Approx. 145 g

Key Features and Industrial Benefits

High-Precision 16-Bit Resolution

Delivers high-accuracy temperature readings with 16-bit analog-to-digital conversion, ensuring fine measurement steps for critical thermal control loops.

Broad Thermocouple Compatibility

Supports all standard industrial thermocouple types (J, K, T, E, R, S, N, B) as well as low-voltage ±80 mV signals, allowing straightforward replacement and broad sensor selection.

Integrated Cold Junction Compensation (CJC)

Features automatic cold-junction compensation to eliminate measurement drift caused by ambient control cabinet temperature fluctuations.

Seamless STEP 7-Micro/WIN SMART Setup

Easily configure sensor types, filter times, temperature units (Celsius/Fahrenheit), and diagnostic alarms directly within the STEP 7-Micro/WIN SMART programming environment.

Applications

• Temperature control in industrial ovens, kilns, and heat treating furnaces

• Plastic injection molding, extrusion equipment, and thermoforming machines

• Food and beverage thermal processing, pasteurization, and packaging

• Process automation monitoring in chemical, pharmaceutical, and HVAC plants