Siemens 6EP1336-3BA10 Retrofit-Compatible Power Supply

Siemens 6EP1336-3BA10 Retrofit-Compatible Power Supply for Legacy Automation Systems

The Siemens 6EP1336-3BA10 is a 24 VDC stabilized power supply module from the SITOP PSU100M series, designed for DIN rail mounting in industrial control cabinets. As legacy SIMATIC S7-300 and S7-400 installations approach end-of-life, the 6EP1336-3BA10 has become a critical retrofit component for engineers tasked with extending the operational lifespan of existing automation infrastructure without committing to a full platform migration. NINERMAS maintains verified stock of this module with full pre-shipment functional testing and a 12-month warranty, supporting procurement teams that require reliable, fast-delivery spare parts for unplanned outages and scheduled maintenance windows.

In retrofit and modernization projects, the power supply is often the first component to be evaluated. The 6EP1336-3BA10 delivers 10 A output current at 24 VDC with a wide-range AC input (100–240 VAC), making it compatible with both European and North American panel standards. Its compact 70 mm width fits standard 35 mm DIN rails and integrates cleanly into existing SIMATIC ET 200M distributed I/O racks, SIMATIC S7-300 backplane assemblies, and third-party control cabinets where space constraints are a primary concern. Engineers replacing aging SITOP SMART or SITOP STANDARD modules will find the 6EP1336-3BA10 a direct form-factor match in most installations, reducing the need for panel re-engineering.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit using the 6EP1336-3BA10 begins with a thorough audit of the existing power distribution architecture. In a typical SIMATIC S7-300 installation, the CPU module — such as a CPU 315-2 DP or CPU 317-2 PN/DP — draws power from the backplane bus, while distributed I/O nodes connected via PROFIBUS DP or PROFINET rely on local 24 VDC supplies. Before swapping the power supply, engineers must calculate the total current draw across all connected SM 321 digital input modules, SM 322 digital output modules, SM 331 analog input modules, and any CP 343-1 communication processors installed in the rack. Undersizing the replacement PSU is a common cause of intermittent faults after retrofit.

Terminal wiring compatibility is the next critical checkpoint. The 6EP1336-3BA10 uses standard screw-type terminals for both AC input and DC output connections. When replacing an older SITOP SMART 5 A unit, the terminal block layout is similar but not identical — wire ferrules and torque specifications must be re-verified against the new module’s datasheet. In cabinets where the original wiring uses 2.5 mm² conductors, no re-cabling is typically required, but the ground bonding point and PE terminal must be confirmed to meet local electrical safety standards.

For systems that include an IM 153-2 interface module connecting remote ET 200M stations, the 24 VDC supply feeding the IM module must remain stable during the switchover. A brief interruption can cause the PROFIBUS DP master — typically the S7-300 CPU — to log a station failure and trigger a program alarm. To avoid this, engineers often use a parallel temporary supply during the hot-swap window, maintaining bus continuity while the primary PSU is replaced. This approach is especially important in process industries where a SIMATIC PCS 7 distributed control system is managing continuous production.

In control cabinets that also house a SIMATIC HMI panel — such as a TP700 Comfort or KTP900 Basic — the 24 VDC rail feeds both the HMI and the PLC rack. After replacing the PSU, the HMI should be power-cycled and its project re-validated to confirm that all tag connections and alarm screens are functioning correctly. Any HMI screens that display power supply status via internal tags should be checked against the new module’s diagnostic output behavior.

Where the control system includes a CP 343-1 Advanced or CP 443-1 EX communication processor for Ethernet-based SCADA connectivity, the network link should be monitored during commissioning to confirm that no packet loss or timeout events occur after the PSU replacement. Signal isolators installed on analog loops — particularly in hazardous area installations — should also be re-verified for loop power compliance after the supply change.

Downtime Control During System Migration

Minimizing unplanned downtime is the primary concern for any maintenance team replacing a power supply in a live production environment. For the 6EP1336-3BA10 retrofit, the recommended approach is to schedule the replacement during a planned maintenance window and prepare a pre-tested spare unit in advance. NINERMAS ships all 6EP1336-3BA10 units with a functional test report, confirming output voltage, ripple, and load regulation before dispatch. This eliminates the risk of receiving a defective unit and discovering the fault only after the original module has been removed.

Before beginning the physical swap, the S7-300 or S7-400 CPU program should be saved to a memory card or uploaded to STEP 7 or TIA Portal on the engineering workstation. This ensures that the PLC program logic — including all data blocks, organization blocks, and function blocks — can be restored immediately if the CPU loses its retentive memory during the power interruption. For systems using a CP 343-5 PROFIBUS master module, the GSD file configuration should also be backed up to avoid re-parameterization after restart.

After the new 6EP1336-3BA10 is installed and powered on, the recommended commissioning sequence is: verify 24 VDC output at the terminal block under no-load conditions, then apply load incrementally by enabling I/O racks one at a time. Monitor the CPU diagnostic buffer in STEP 7 or TIA Portal for any hardware fault entries. If the system includes a redundant power supply configuration using a SITOP UPS module or a 6EP1961-2BA00 buffer module, the UPS handover behavior should be tested before returning the system to production.

For multi-cabinet installations where several 6EP1336-3BA10 units are being replaced as part of a broader lifecycle refresh, a phased approach — replacing one cabinet at a time while maintaining production on the remaining lines — is strongly recommended. This limits the blast radius of any unexpected compatibility issue and allows the maintenance team to validate each replacement before proceeding to the next cabinet.

Retrofit Support FAQ

Q1: Is the 6EP1336-3BA10 a direct drop-in replacement for the SITOP SMART 10 A (6EP1334-2BA20)?
The 6EP1336-3BA10 and 6EP1334-2BA20 share the same 24 VDC / 10 A output specification and DIN rail mounting format. However, the terminal block layout and housing width differ slightly between PSU100M and SITOP SMART series. Before installation, verify terminal pitch, wire entry direction, and available panel width. No software configuration is required for either unit.

Q2: Does NINERMAS test the 6EP1336-3BA10 before shipment?
Yes. Every unit shipped by NINERMAS undergoes pre-shipment functional testing covering output voltage accuracy, load regulation, and ripple measurement. A test report is available upon request. All units are covered by a 12-month warranty from the date of shipment.

Q3: Can the 6EP1336-3BA10 be used in a SIMATIC PCS 7 or ET 200M distributed I/O environment?
Yes. The 6EP1336-3BA10 is compatible with any 24 VDC-powered SIMATIC installation, including PCS 7 cabinets, ET 200M remote I/O stations, and standalone S7-300 racks. It does not require PROFIBUS or PROFINET connectivity and operates as a standalone power supply. Confirm total current load across all connected modules before selecting this unit.

Q4: What is the lead time and stock availability for the 6EP1336-3BA10?
NINERMAS maintains ready stock of the 6EP1336-3BA10 for immediate dispatch. Standard international shipping lead time is 3–7 business days depending on destination. For urgent requirements or bulk procurement, contact sale@ninermas.com or call +0086 187 5021 5667 to confirm availability and arrange priority shipment.