The Siemens 6ES7414-4HM14-0AB0 is a high-performance SIMATIC S7-400H CPU (Central Processing Unit), specifically designed for redundant industrial automation systems requiring continuous operation and high availability. It is part of Siemens’ S7-400H product line, tailored for mission-critical applications where downtime leads to significant costs.
- Product Series: SIMATIC S7-400H (High-Availability)
- CPU Model: CPU 414-4H
- Hardware Version: V4.0
- Product Status: Discontinued (no longer in production; Siemens recommends migration to S7-1500R/H series for new projects)
- Key Function: Serves as the core of redundant S7-400H systems, enabling automatic failover between two synchronized CPUs to ensure uninterrupted process control.
- Dimensions (W×H×D): ~233 mm × 303 mm × 65 mm (standard S7-400H rack-mount form factor)
- Weight: Approximately 1.1 kg
- Operating Temperature: -20°C to +60°C (non-condensing)
- Storage Temperature: -40°C to +85°C
- Protection Rating: IP20 (intended for indoor, control cabinet mounting; not suitable for direct field installation)
- Mounting: Installed in S7-400H racks (e.g., UR2-H) via the backplane bus connector; secured with locking clips to prevent accidental disconnection.
The CPU 414-4H is engineered for high-availability industrial scenarios where system uptime is critical. Its core roles include:
- Redundant Control:
- Works in a dual-CPU configuration to eliminate single points of failure. The two CPUs continuously synchronize program logic, process data, and I/O states via sync modules.
- Automatically detects faults (e.g., CPU hardware failure, power loss) and triggers seamless failover to the standby unit.
- Process Integration:
- Connects to distributed I/O systems (e.g., ET 200M) via PROFIBUS DP, enabling control of large-scale industrial processes.
- Supports integration with HMIs, SCADA systems, and upper-level management systems via MPI or PROFIBUS.
- Diagnostics & Maintenance:
- Built-in LED indicators for power, CPU status, synchronization, and communication errors.
- Logs fault data to facilitate rapid troubleshooting and minimize downtime.
Typical Applications:
- Oil and gas refineries
- Chemical and pharmaceutical production lines
- Power generation (e.g., thermal, nuclear, renewable energy plants)
- Water and wastewater treatment facilities
- Automotive manufacturing (critical assembly lines)
As the S7-400H series is discontinued, Siemens recommends migrating to the SIMATIC S7-1500R/H series for new installations or system upgrades. Key advantages of the S7-1500R/H over the S7-400H include:
- Higher processing power and larger memory capacity.
- Native support for PROFINET (in addition to PROFIBUS) with faster communication speeds.
- Seamless integration with TIA Portal engineering software (replacing the older STEP 7).
- Enhanced redundancy features, such as shorter failover times (< 100 ms) and simplified configuration.
Recommended Replacement Model:
S7-1500RH CPU, e.g.,
6ES7518-4AX00-0AB0 (CPU 1518-4 PN/DP R/H), which offers comparable redundancy capabilities with modernized hardware and software.
