SIEMENS 6ES7412-3HJ14-0AB0

Overview

SIEMENS 6ES7412-3HJ14-0AB0 is the SIMATIC S7-400H CPU 412-3H V4.5 redundant central processing unit for S7‑400H and S7‑400F/FH fault-tolerant PLC systems. It is designed for hot-standby redundant control, widely supplied as exchange spare for PCS7, power plant, oil & gas and chemical DCS cabinet overhaul. The successor model is 6ES7412-5HK06-0AB0 (V6).

Features

SIEMENS 6ES7412-3HJ14-0AB0 supports S7‑400H redundant synchronization with two dedicated sync ports, compatible with 6ES7960-1AA04-5KA0 10-meter synchronization fiber cable only. It implements bumpless master-slave switchover, automatic program and process data synchronization between paired CPUs. SIEMENS 6ES7412-3HJ14-0AB0 integrates one MPI/DP interface, which can operate as PROFIBUS DP master or MPI communication port for HMI, distributed I/O and engineering station connection. It supports Failsafe program execution for S7‑400F safety applications, conforming to relevant safety standards. SIEMENS 6ES7412-3HJ14-0AB0 supports programming languages including STL, LAD, FBD, SCL, CFC, GRAPH and HiGraph, and is configured via STEP7 or PCS7 engineering software. Onboard LED indicators display run, stop, fault, sync status and diagnostic alarms for field troubleshooting. It supports timestamped diagnostic messages and alarm upload to SCADA systems for event logging. It carries CE, UL, cULus, FM and marine certifications.

Specs

SIEMENS 6ES7412-3HJ14-0AB0 Platform: SIMATIC S7-400H. Type: CPU 412-3H V4.5. Work memory: 768 KB (512 KB program / 256 KB data). Interfaces: 1 × MPI/DP, 2 × sync interface. Sync accessory: 6ES7960-1AA04-5KA0 (10m fiber). Mounting: S7-400 UR rack slot. Power: 5V backplane bus power supply. This is a redundant CPU module, not a standard single CPU. SIEMENS 6ES7412-3HJ14-0AB0 is widely supplied as service replacement spare for redundant DCS and safety control systems.

Principle

SIEMENS 6ES7412-3HJ14-0AB0 runs in a paired redundant configuration. One CPU acts as master to execute control logic and drive I/O, while the standby CPU synchronizes all process images, tags and internal state via fiber sync link. If master CPU fails, the standby unit takes over control automatically without process interruption. The MPI/DP port of SIEMENS 6ES7412-3HJ14-0AB0 exchanges data with ET200M remote I/O, operator stations and third-party devices. Diagnostic and fault information is sent to the engineering platform for failure analysis and maintenance.

Applications

SIEMENS 6ES7412-3HJ14-0AB0 is deployed for redundant PCS7 DCS, boiler control, gas compressor, pipeline, water treatment and marine automation systems requiring high availability. It is selected for spare inventory and cabinet retrofit projects for existing S7‑400H V4.5 fault-tolerant control systems.