What are the core differences among the M12 connector A/B/D/K/S/T/X codes? And what are the main application scenarios for each?

Core Differences & Main Application Scenarios of M12 Connector (A/B/D/K/S/T/X Coding)

Core Distinction Principle

Key Differences : The core differences of each coding type lie in pin definition, locking position and transmission performance. The selection must match the corresponding industrial bus or equipment communication protocol strictly.

Full Coding Specification & Application Scenarios

A-coded

2-17 cores, the first choice for sensor/actuator signal transmission, compatible with basic IO-Link, the most widely used specification.

B-coded

4/5 cores, specially designed for PROFIBUS DP bus, supports low-speed data transmission, mostly used for industrial control system networking.

D-coded

4/8 cores, dedicated for industrial Ethernet, compatible with PROFINET & EtherNet/IP, 8-core version supports Gigabit transmission.

K-coded

3/4 cores, main for CAN bus system, strong anti-electromagnetic interference, suitable for automotive electronics and engineering machinery.

S-coded

4 cores, designed for ASI bus, used for networking control of simple equipment with low transmission rate.

T-coded

8 cores, compatible with multiple industrial Ethernet protocols, supports mixed transmission of signal and power, suitable for smart sensors.

X-coded

12 cores, high-density transmission type, supports parallel transmission of multi-channel signal + power, used for complex integrated equipment.

Technical Note: Different coded connectors adopt anti-mismatch structural design, which cannot be plugged into each other, effectively avoiding equipment failure and signal confusion caused by wrong insertion.

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