Estimated Shipping Size: 25.4×7.6×30.5 cm
Manufacturer: Siemens
Weight: 0.64 kg
Product Type Designation: CPU 414-4H
Programming Package: STEP 7 V5.3 SP2 or higher with HW update
CiR Synchronization Time, Basic Load: 100 ms
CiR Synchronization Time, per I/O Byte: 25 µs
Power Specifications
Rated Value (DC): Power supply via system power supply
From Backplane Bus 5 V DC, typical: 1.4 A
From Backplane Bus 5 V DC, maximum: 1.7 A
From Backplane Bus 24 V DC, maximum: 150 mA (Per DP interface)
From Interface 5 V DC, maximum: 90 mA (At each DP interface)
How does the 6ES7414-4HM14-0AB0 manage bumpless transition during a CPU switchover?
The "H" architecture in this processor utilizes dedicated synchronization modules to maintain a "hot standby" state. Data consistency is ensured via the Synchronization Time (Basic Load of 100 ms), where the active unit continuously mirrors the process image and internal registers to the standby unit. This ensures that in the event of a primary fault, the transition is transparent to the process, maintaining system integrity without interrupting the logic execution.
What are the critical power budget considerations for the backplane bus integration?
Engineering the power supply requires accounting for both typical and peak consumption. The CPU 414-4H draws a typical current of 1.4 A (5 V DC) from the backplane, but engineers must calculate the total power budget based on the maximum peak of 1.7 A. Furthermore, if utilizing the DP interfaces, an additional 150 mA at 24 V DC must be factored in per interface to prevent voltage drops that could trigger bus communication errors.
When implementing Configuration in RUN (CiR), how is the impact on scan cycle time calculated?
CiR functionality allows for hardware modifications without stopping the process. The overhead calculation is deterministic: a base synchronization load of 100 ms is coupled with an incremental latency of 25 µs per I/O byte. System integrators must evaluate whether this cumulative synchronization time fits within the "Watchdog" limits of the application to avoid unintended cycle overflows during hardware updates.
Is the legacy STEP 7 environment sufficient for configuring this specific firmware iteration?
While the 6ES7414-4HM14-0AB0 belongs to the S7-400 family, it requires STEP 7 V5.3 SP2 or higher. It is vital to note that a simple version match is often insufficient; a specific Hardware Update (HSP) is mandatory to recognize the unique parameters and diagnostic addresses of the 4HM14-0AB0 module within the SIMATIC Manager hardware configuration.
How do the physical dimensions influence thermal management within the control cabinet?
With a shipping size of 25.4 × 7.6 × 30.5 cm and a weight of 0.64 kg, this CPU is a dense processing unit. In high-availability setups where two such CPUs are mounted in close proximity on a UR2-H rack, the thermal dissipation of the 1.7 A current draw becomes significant. Maintaining vertical clearance for natural convection or forced-air cooling is critical to prevent premature aging of the internal electrolytic capacitors.
What is the significance of the "Per DP interface" 24V power specification?
The specification of 150 mA at 24 V DC per DP interface refers to the power available for external components, such as RS485 repeaters or active termination resistors. If the fieldbus topology requires multiple active bus components powered directly through the CPU's interface ports, exceeding this 150 mA threshold will jeopardize the communication stability of the entire Profibus segment.
In terms of fault-tolerant synchronization, what occurs during the 25 µs "Time per I/O byte" window?
This is the granular delay required to synchronize peripheral data between the master and standby CPUs. During a CiR operation, the system locks the I/O image update for this duration to ensure that both processors are "seeing" the exact same state. This high-speed synchronization is what allows the S7-400H to handle complex motion control or safety-related tasks where millisecond-level precision is non-negotiable.
How does the 6ES7414-4HM14-0AB0 handle synchronization if the fiber optic link is compromised?
This processor relies on redundant synchronization sub-modules. If the fiber-optic link fails, the "H" system loses its redundancy (entering "Solo Mode"), but the active CPU continues operation. However, the CiR synchronization times mentioned in the specs become irrelevant at that point, as the CPU can no longer perform the 100 ms / 25 µs data mirroring required for a fail-safe handover. Reliable operation depends on the integrity of the backplane bus 5V supply and the optical link health.
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