Siemens 6ES7315-6TH13-0AB0 Migration-Ready CPU for S7-300

Overview

Siemens 6ES7315-6TH13-0AB0 Migration-Ready CPU for Legacy S7-300 Control Systems

The Siemens 6ES7315-6TH13-0AB0 is a CPU 315T-3 PN/DP module engineered for demanding industrial automation environments where legacy S7-300 infrastructure must be preserved while modernizing control capability. This unit supports PROFINET IO, PROFIBUS DP (master/slave), and MPI communication simultaneously, making it a direct migration-ready replacement for aging or discontinued S7-300 CPU variants including the 6ES7315-2EH14-0AB0 and 6ES7315-2FJ14-0AB0 series. For facilities managing multi-axis motion control alongside standard PLC logic, the integrated technology functions (T-CPU) eliminate the need for separate motion controllers, reducing rack footprint and simplifying cabinet wiring.

Engineers planning a retrofit must verify several critical parameters before commissioning. Power supply capacity on the existing S7-300 rack — typically a PS 307 5A or PS 307 10A — must be confirmed against the new CPU’s current draw on the 5 VDC backplane bus. Terminal wiring on the MPI/DP port (X1) and PROFINET port (X2) should be documented and re-mapped if the replacement CPU uses a different port assignment. Backplane slot addressing must be re-confirmed in STEP 7 or TIA Portal, particularly if the rack previously hosted a CPU in slot 2 with distributed I/O modules in slots 4–11. Module addresses assigned to SM 321/SM 322 digital I/O modules and SM 331/SM 332 analog I/O modules must remain consistent to avoid program logic errors during hot-swap commissioning.

Program compatibility is a primary concern. Projects developed in STEP 7 V5.x can be migrated to TIA Portal V15.1 or later using the integrated migration tool, but technology objects (TO) for axis control must be re-parameterized. HMI screens built on WinCC flexible or TP/OP panels connected via MPI must be re-tested after CPU replacement to confirm tag addressing and alarm routing remain intact. Communication links to SIMATIC ET 200M or ET 200S distributed I/O stations over PROFIBUS DP should be verified at the DP master system level, confirming GSD file versions and station addresses are unchanged.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit of the 6ES7315-6TH13-0AB0 into an existing S7-300 control cabinet begins with a full audit of the rack configuration. In a typical installation, the CPU occupies slot 2, with a PS 307 10A power supply in slot 1 and up to eight signal modules — commonly SM 321 DI 32×DC 24V and SM 322 DO 32×DC 24V — filling slots 4 through 11. If the legacy system used a CPU 315-2 DP without PROFINET capability, the addition of PROFINET IO opens the path to connecting CP 343-1 communication processors or migrating remote I/O from PROFIBUS to PROFINET without changing the physical cabinet layout.

For motion-intensive applications, the T-CPU technology functions of the 6ES7315-6TH13-0AB0 allow direct integration with SINAMICS S120 drive systems via PROFINET, replacing older MASTERDRIVES MC configurations that relied on CBP2 communication boards and PROFIBUS DP. Engineers should confirm that the drive’s telegram type (e.g., Telegram 105 for positioning) is correctly mapped in the technology object configuration. Signal isolators between the CPU’s digital outputs and high-voltage actuator circuits should be retained and re-verified for compatibility with the new module’s output timing characteristics.

Where the existing system includes a CP 342-5 PROFIBUS master module for third-party device connectivity, this module can remain in the rack alongside the new CPU, preserving legacy fieldbus topology while the PROFINET interface handles new device integration. IM 360/IM 361 expansion rack interface modules used for multi-rack configurations are fully compatible and require no replacement. Programming cables such as the PC Adapter USB A2 remain valid for direct MPI connection during on-site commissioning and firmware verification.

Downtime Control During System Migration

Minimizing production downtime during a CPU swap requires a structured pre-migration checklist. Before removing the legacy CPU, perform a full project backup from STEP 7 or TIA Portal, including hardware configuration, symbol tables, and all OB/FB/FC/DB blocks. Export the current CPU diagnostic buffer and note any active faults. Document all DP slave station addresses and PROFINET device names — these must be restored identically on the replacement CPU to avoid communication loss with distributed I/O.

During the physical swap, the S7-300 rack does not require removal from the DIN rail. The CPU module slides out from slot 2 after releasing the front connector and bus connector. The replacement 6ES7315-6TH13-0AB0 is inserted and the hardware configuration is downloaded via MPI or PROFINET. A warm restart sequence should be performed to verify that all I/O modules return to RUN state and that the PROFIBUS DP master system re-establishes communication with all slave stations within the expected cycle time.

For systems where continuous process control is critical, a parallel commissioning approach is recommended: configure and test the new CPU on a bench rack with representative I/O modules before the scheduled maintenance window. This allows firmware verification, program download, and technology object parameterization to be completed offline, reducing live switchover time to under 30 minutes in most S7-300 retrofit scenarios. All pre-shipment testing performed on this unit confirms power-on functionality and communication port integrity, further reducing on-site risk.

Retrofit Support FAQ

Q1: Is the 6ES7315-6TH13-0AB0 a direct drop-in replacement for the 6ES7315-2EH14-0AB0?
Yes, mechanically and electrically it fits the same S7-300 slot 2 position and uses the same backplane bus connector. The primary difference is the addition of PROFINET IO and integrated technology (T-CPU) functions. The hardware configuration in STEP 7 or TIA Portal must be updated to reflect the new CPU order number, and technology objects must be re-parameterized if motion control functions are used. Standard PLC logic (OBs, FBs, FCs, DBs) transfers without modification in most cases.

Q2: What wiring changes are required at the MPI/DP terminal?
The MPI/DP port (X1) uses a standard 9-pin Sub-D connector, identical to previous S7-300 CPU generations. No wiring changes are required for existing MPI or PROFIBUS DP cable connections. The PROFINET port (X2) uses RJ45 and will require a new Ethernet cable if PROFINET IO is being added as part of the retrofit. Ensure the PROFINET device name assigned to the CPU in the hardware configuration matches the name stored on the CPU after download.

Q3: Has this unit been tested before shipment, and what support terms is provided?
Yes. Every 6ES7315-6TH13-0AB0 unit undergoes pre-shipment functional testing including power-on verification and communication port integrity checks. A support terms confirmed by quotation is provided from the date of shipment, covering manufacturing defects and functional failures under normal operating conditions. Expedited replacement support is available for critical production environments.

Q4: Is stock available for immediate dispatch, and can multiple units be supplied for a phased rollout?
Yes. This SKU is held in multi-region stock to support both emergency single-unit replacements and phased multi-cabinet retrofit programs. Global dispatch is available with lead times confirmed at order. For projects requiring 5 or more units across multiple maintenance windows, contact our sales team to confirm allocation and staggered delivery scheduling.

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6ES7315-6TH13-0AB0
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