Siemens SIMATIC M7 EXM 378-2B PLC Extension Module

Description

The 6ES7378-2AB00-0AC0 is an EXM 378-2B extension module designed for the Siemens SIMATIC M7-300 and M7-400 automation systems. This module serves to expand the I/O capacity of the controller, featuring dedicated analog and digital I/O ports via high-density D-sub connectors. As a component of the now-obsolete SIMATIC M7 family, this module is a critical spare part for maintaining legacy PC-based control systems. It operates on a standard 24V DC power supply.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC M7
• Model: EXM 378-2B
• Part Number: 6ES7378-2AB00-0AC0
• Power Supply: 24V DC, 0.7A
• Connectors: 1x Analog I/O Port (D-sub), 1x Digital I/O Port (D-sub)

Label Info

• SIMATIC M7-300
• 6ES7 378-2AB00-0AC0
• INPUT DC24V 0.7A

Application

This module is used exclusively with Siemens SIMATIC M7 series controllers, which were typically employed in complex, PC-based automation tasks in manufacturing, process control, and machine building during the 1990s and early 2000s.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this refurbished or used part, you are actively participating in the circular economy. The reuse of this 0.8kg electronic module avoids the production of a new one, saving an estimated 32 kg of CO2. This is equivalent to the emissions from driving a car for 160 kilometers.

Availability

This obsolete component is available from our stock as a crucial spare for system maintenance and repair. Order now from PLC2Day for expert support and fast delivery.

FAQ

No, this module is specifically for the obsolete SIMATIC M7-300 and M7-400 series. It is not compatible with the S7-300, S7-400, or any modern SIMATIC systems.

These ports are high-density D-sub connectors. You will need specific pre-fabricated cables from Siemens or custom-made cables with the correct pinout for your application to connect to field devices.

Yes, like any PLC module, it must be correctly configured in the hardware configuration of your SIMATIC M7 project using the appropriate Siemens engineering software (e.g., M7-SYS).

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Last Update: Friday, March 13, 2026