ABB  TPPB-02 – Replacement Battery for SIMATIC S7-400 Power Supply Units

If you’re maintaining a legacy SIMATIC S7-400 automation system, the TPPB-02 is one of those small but critical components that often gets overlooked—until the RAM backup fails during a power cycle. This battery module is designed specifically to preserve user program data and runtime parameters when the main power drops or the CPU is removed. From my experience supporting plant engineers in automotive and energy sectors, this part tends to last 5–7 years under normal conditions, but I’ve seen premature failures in environments with poor cabinet ventilation.

Key Features

• Non-volatile memory support: Keeps the CPU’s working memory intact during power outages, which is especially important if your system doesn’t use a permanent storage card.
• Plug-in modular design: Installs directly onto the backplane of S7-400 PS modules like the PS 407 and PS 405—no wiring needed. One thing I appreciate is how quickly field technicians can swap it during planned shutdowns.
• Low self-discharge lithium chemistry: Typically holds charge well over years, though performance seems to degrade faster in cabinets running above 40°C.
• Diagnostics via STEP 7: The CPU can report low battery status through HW Config, so you’re not flying blind—assuming your project archive is still accessible.

Technical Specifications

Application Fields

The TPPB-02 is typically found in older but still operational S7-400 systems across heavy industries—think steel mills, water treatment plants, and combined heat and power stations. These are environments where full PLC upgrades aren’t justified due to stable performance, but spare parts availability becomes a growing concern. In many cases, users rely on these batteries because their CPUs (like the 414-3 or 416-2) don’t have built-in memory cards and depend on battery-backed RAM.

Advantages & Value

While it’s just a battery, its role in system continuity makes it disproportionately important. Procuring an authentic TPPB-02 means avoiding unexpected downtime—especially during maintenance windows when power is cycled. You might notice that third-party clones exist, but they often fail earlier and aren’t supported in Siemens diagnostic tools. Also, having this module on hand reduces dependency on offline program backups, which, let’s be honest, aren’t always up to date.

Installation & Maintenance

Installation is straightforward—just align the module with the guide rails on the PS unit and press until it clicks. Make sure the system is powered down first; hot-swapping isn’t supported here. For maintenance, check the battery status annually via STEP 7 or the CPU diagnostic buffer. If you’re replacing an old unit, do a full program upload beforehand—just in case. Keep spare batteries sealed and stored below 25°C; prolonged exposure to heat during storage can reduce effective lifespan.

Quality & Certifications

The original Siemens TPPB-02 meets RoHS compliance and carries CE marking for industrial electromagnetic compatibility and safety. It’s also tested to UL standards as part of the broader S7-400 system certification. Our warranty covers 365 days from shipment, assuming proper installation and operating conditions. We recommend using only factory-fresh units—not refurbished or long-stored batches—as battery capacity can diminish even without use.

Delivery takes about one week for in-stock units, or up to four weeks if we need to source it. Payment is 50% upfront, with the balance due before dispatch. We ship globally via FedEx, UPS, or DHL—your choice.