Siemens 6DD1681-0CA2 Interface Module

Siemens 6DD1681-0CA2 Interface Module

6DD1681-0CA2 Specifications

6DD1681-0CA2 Description

The Siemens 6DD1681‑0CA2 is an interface module designed for use in Siemens industrial systems, specifically as 

part of the SIMADYN D control family. It functions as a SITOR‑interface SE20.2 module, facilitating reliable communication 

and signal transfer between control systems and connected devices such as converter systems and field equipment. 

This 6DD1681-0CA2 module supports direct mounting for PG16, PG26, and PT20G connectors, enabling flexible 

integration into control racks and infrastructure. Built to industrial standards with a compact design and robust signal 

handling, the 6DD1681-0CA2 module helps ensure deterministic data exchange and enhanced operational stability in 

process and motion control environments.

Frequently asked questions：

Q1: What is the 6DD1681-0CA2?
A1: The 6DD1681-0CA2 is a Siemens interface module used for industrial communication and control 

system integration.
Q2: What is the 6DD1681-0CA2 operating voltage?
A2: It operates on DC 24 V.
Q3: What communication interface does it support?
A3: It uses an RS-485 communication interface for data exchange.
Q4: What is the 6DD1681-0CA2 operating temperature range?
A4: Safe operation is between −25 °C and +60 °C.
Q5: What is the 6DD1681-0CA2 storage temperature range?
A5: The recommended storage range is −40 °C to +70 °C.

Product Applications

High-end drive and control: Applied to motor control systems and frequency converter control with high dynamic 

requirements.
Metal processing and metallurgy: Suitable for continuous production lines such as rolling mills and continuous 

casting machines, achieving precise speed and position control.
Heavy machinery and construction machinery: As the communication interface for control units, ensuring the 

accuracy of movements for large lifting equipment or excavation equipment.
Power system: As an interface module in energy management or control systems that require high-speed acquisition 

and processing of analog/digital signals.
Industrial process control: Commonly used as signal conversion and transmission modules in production lines.

Technical highlights:
High-speed performance: The design aims to handle the most complex process control tasks in the SIMATIC series.
Direct coupling: Supports direct coupling with PG16, PG26, and PT20G, enhancing system integration.
Industrial-grade durability: Manufactured with high-quality materials, it can operate stably in high electromagnetic 

interference production sites (such as steel mills).

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