SIEMENS 6ES7313-5BG04-0AB0

What is the 6ES7313-5BG04-0AB0 and where is it used?

The SIEMENS 6ES7313-5BG04-0AB0 is a SIMATIC S7-300 CPU 313C in a compact design. It combines the controller function with integrated digital and analogue inputs and outputs within a single module. This makes it particularly suitable for compact machines, retrofit projects and clearly defined automation tasks. Typical applications include conveyor systems, assembly stations, packaging machines, test systems and smaller process sections with local I/O requirements. The CPU communicates via MPI, operates on 24 V DC, and requires a SIMATIC Micro Memory Card as well as two 40-pin front connectors. It is therefore especially attractive wherever existing S7-300 systems need to be maintained, replaced or economically secured with minimal effort.

Overview of the key technical data and what it means

The CPU provides 24 digital inputs, 16 digital outputs, 4 analogue inputs, 2 analogue outputs, 1 Pt100 channel and 3 high-speed counters up to 30 kHz. For many machine control applications, this is a major advantage because standard I/O and technological functions are already integrated without requiring additional base modules. The 128 KB work memory is designed for typical S7-300 applications using conventional STEP 7 engineering. Power is supplied via 24 V DC, with an allowable range of 19.2 to 28.8 V DC. The CPU has a typical current consumption of 650 mA and a typical power dissipation of 12 W. Siemens specifies STEP 7 V5.5 + SP1 or higher, or STEP 7 V5.3 + SP2 with HSP 203, for engineering. Another practical advantage is that the integrated channels use fixed standard address ranges, simplifying commissioning and replacement in existing installations.

Product status, life-cycle status and obsolescence

Siemens currently classifies the module as a spare part. According to the manufacturer information reviewed, an Announcement of Product Phase-Out was issued effective 01 October 2023, followed by Product Cancellation effective 01 October 2025. The EICHLER product page additionally lists the status as EOP: 2025-10-01. For maintenance, purchasing and production managers, this means that the CPU should be included in an active obsolescence management strategy, as long-term availability and spare-part supply may become increasingly limited. A clearly verified 1:1 plug-and-play successor for this exact MLFB could not be confirmed in the reviewed Siemens sources. For migration to the S7-1500 platform, Siemens identifies the CPU 1511C as a target CPU. However, this is a migration option, not a direct replacement without engineering effort.

Available EICHLER services and when they are relevant

For this CPU, EICHLER offers several practical options: repair, exchange, used and new units. Repair is particularly beneficial when the existing program, wiring and approvals should remain unchanged; EICHLER specifies typical turnaround times of 2 to 5 days. Exchange, used and new units are especially useful when unplanned downtime must be resolved quickly; the product page typically indicates 1 to 3 days for these options. An optional test report for CPUs/central processing units is also available, which is valuable for quality-critical systems and documentation requirements. Repair services include technical cleaning, preventive maintenance, comprehensive functional testing and a minimum 24-month warranty. This helps ensure continued operation of existing systems even when the CPU is already operating within an obsolescence environment.

Is the 6ES7313-5BG04-0AB0 still available or has it been discontinued?

The CPU is no longer a standard growth product. Siemens classifies it as a spare part and specifies an Announcement of Product Phase-Out effective 01 October 2023 as well as a Product Cancellation effective 01 October 2025. At the same time, the EICHLER product page shows that several procurement and service options remain available for this CPU, including repair, exchange, used and new units. For purchasing and maintenance departments, this means that the CPU is still available, but it should no longer be treated as a long-term low-risk catalogue item. Availability, response time and supply security should be actively managed.

Which memory card does the 6ES7313-5BG04-0AB0 require?

The CPU requires a SIMATIC Micro Memory Card (MMC). Siemens explicitly states that these CPUs do not have an integrated load memory and therefore cannot operate without an MMC installed. The datasheet also specifies a pluggable load memory of up to 8 MB. For operators, it is important that the card is not only compatible with the CPU but also provides sufficient capacity for project and application data. When troubleshooting issues related to card replacement, project transfer or memory reset procedures, the MMC should always be one of the first items checked.

Which software can be used to configure the CPU?

Siemens specifies STEP 7 V5.5 + SP1 or higher, or STEP 7 V5.3 + SP2 with HSP 203, for engineering this CPU. In addition, Siemens notes in the firmware documentation that TIA Portal V12 or later should be used where possible. For existing installations, this confirms that the CPU is strongly rooted in the classic STEP 7 environment, while still being supported in many modern engineering environments. Before making changes to critical systems, the project version, hardware catalogue and firmware version should always be checked for consistency.

Can I simply replace a defective CPU 313C with the same part number?

Replacing the unit with the same MLFB 6ES7313-5BG04-0AB0 minimises the amount of modification required because the basic functionality and integrated I/O structure remain unchanged. Before returning the system to operation, however, the MMC contents, hardware configuration, addressing, firmware version and diagnostic buffer should be checked. In older systems, problems are often caused not by the CPU itself but by incompatible memory card contents, inconsistent project versions or peripheral deviations. In practice, a 1:1 replacement is usually the safest approach, provided that the project, memory card and connected peripherals have been verified beforehand.

Is there a direct successor or only a migration option?

For this exact part number, no clearly verified 1:1-compatible direct successor could be confirmed in the reviewed Siemens documentation. In the S7-300/S7-400 to S7-1500 migration guide, Siemens identifies the CPU 1511C as the target CPU for modernisation projects. This is important for decision-makers because the 1511C represents a documented migration path, but not a plug-compatible replacement without engineering effort, hardware verification and migration planning. For short-term availability, the combination of repair, exchange or sourcing an identical replacement CPU is generally the lower-risk option.

When is repair more economical than used, exchange or new equipment?

Repair is particularly cost-effective when the system must be returned to operation quickly and the existing program, wiring and approval status should remain unchanged. Exchange units are advantageous when downtime is the critical factor and a fully tested replacement is required immediately. Used units can be attractive when availability and budget are the primary concerns. New units are often preferred by organisations that require the clearest possible material history and traceability. At EICHLER, the decision is further supported by short response times, optional test reports and a minimum 24-month warranty on repairs, helping operators balance cost, risk and long-term availability.