Siemens SIMATIC S7-300 CPU Module 6ES7138-4DJ00-0AB0

The 6ES7138-4DJ00-0AB0 is an original Siemens SIMATIC S7-300 series PLC central processing unit (CPU). Designed for industrial automation tasks on the S7-300 platform — handling control programs, coordinating I/O modules and communicating with other system modules. The part number identifies the specific Siemens configuration, making this module suitable as a replacement or expansion for S7-300 controller hardware. Verify firmware compatibility and system configuration before installation.