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Siemens 6ES7314-1AE04-0AB0


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2 Year warranty

Part Number6ES7314-1AE04-0AB0
Model #6ES73141AE040AB0
Warranty2 Year
RangeSIMATIC S7-300
CategoryCPU 314
Memory24 KBYTE
Input current1 000 mA
Load memoryFlash-EPROM
CPU processing timesfor bit operations, typ. 0.3 µs for bit operations, max. 0.6 µs for word operations, typ. 1 µs for fixed point arithmetic, typ. 2 µs for floating point arithmetic, typ. 50 µs for timer/counter operations, typ. 12 µs
S7 counter64
S7 times128
Time range10 ms upper limit, 9 990 s lower limit
Rack32 per rack max
Configuration software STEP 7V5.0, V5.0 SP1

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MRO can restore your failed 6ES7314-1AE04-0AB0 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

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If you are interested in getting credit for your faulty 6ES7314-1AE04-0AB0, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 6ES7314-1AE04-0AB0 Overview

Siemens 6ES7314-1AE04-0AB0

The Siemens 6ES7314-1AE04-0AB0 is a part of the SIMATIC S7-300 series, specifically a CPU 314 CPU with an integrated 24 V DC power supply and 24 Kbyte working memory. As a central processing unit, it plays a vital role in controlling and monitoring industrial automation processes.

Power Supply and Voltage

The CPU operates with a rated supply voltage of 24 V DC, with a permissible range from 20.4 V to 28.8 V. It consumes a rated current of 1000 mA, and the typical inrush current is 8 A. The maximum power loss is 8 W, making it an efficient choice for industrial applications.


The integrated work memory is 24 Kbyte, with 24 KB/8 K instructions RAM (integrated). The load memory is expandable through Flash-EPROM (FEPROM) technology, with a maximum capacity of 4 Mbyte. The CPU also features integrated RAM with a maximum capacity of 40 Kbyte. Backup is available with or without a battery, supporting all blocks or specific memory areas (4 KB: bit memory, counter, times, and data).

Processing Times

The CPU's processing times vary for different operations:

  • Bit operations: Typical 0.3 µs, Maximum 0.6 µs
  • Word operations: Typical 1 µs
  • Fixed point arithmetic: Typical 2 µs
  • Floating point arithmetic: Typical 50 µs
  • Timer/counter operations: Typical 12 µs

CPU Blocks and Nesting Depth

The CPU supports a variety of blocks:

  • DB (Data Blocks): Max. 127 with a size of max. 8 Kbyte
  • FB (Function Blocks): Max. 128 with a size of max. 8 Kbyte
  • FC (Function Calls): Max. 128 with a size of max. 8 Kbyte
  • OB (Organization Blocks): Max. 128 with a size of max. 8 Kbyte

The nesting depth is 8 per priority class.

Counters, Timers, and Data Areas

The CPU supports 64 S7 counters and 128 S7 times, each with retentive and adjustable settings. There are 256 bytes available for flag data areas, with retentivity options.

Addressing Volume and Hardware Configuration

The CPU supports various addressing volumes for I/O address areas, process images, digital channels, and analog channels. The hardware configuration allows a maximum of 3 expansion units and supports connection to programming devices or PCs with STEP 7 via the MPI interface.


The CPU features an MPI interface with various functionalities:

  • MPI cable length: Max. 9,100 m
  • Number of nodes: Max. 32
  • Transmission rate: Max. 187.5 kbit/s

Communication Functions

The CPU supports various communication functions such as PG/OP communication, global data communication, S7 basic communication, S7 communication, and more. It is compatible with S5 communication and standard communication (FMS).

Programming and Software

Programming can be done using the STEP 7 software (Version 5.0 or later), and the CPU supports multiple programming languages, including LAD, FBD, STL, SCL, and GRAPH.

Dimensions and Weights

The physical dimensions of the CPU are 80 mm (width) x 125 mm (height) x 130 mm (depth), with a weight of approximately 530 g.

Frequently Asked Questions (FAQ) about Siemens 6ES7314-1AE04-0AB0 SIMATIC S7-300 CPU

Q1: What is the primary function of the Siemens 6ES7314-1AE04-0AB0 CPU?

A1: The 6ES7314-1AE04-0AB0 is a central processing unit (CPU) designed for industrial automation. It performs control and monitoring functions in conjunction with the SIMATIC S7-300 series.

Q2: What is the power supply voltage range for this CPU?

A2: The CPU operates with a rated supply voltage of 24 V DC, within a permissible range of 20.4 V to 28.8 V.

Q3: Can the 6ES7314-1AE04-0AB0 work without a battery backup?

A3: Yes, the CPU can operate without a battery for specific memory areas (4 KB: bit memory, counter, times, and data). However, it also supports backup with a battery for all blocks.

Q4: What is the maximum work memory capacity of the integrated RAM?

A4: The integrated RAM has a maximum capacity of 24 Kbyte, with 24 KB/8 K instructions RAM (integrated).

Q5: How many S7 counters and timers does the CPU support?

A5: The CPU supports 64 S7 counters and 128 S7 times, each with retentive and adjustable settings.

Q6: What are the typical processing times for various operations on this CPU?

A6: Processing times vary, e.g., for bit operations: Typical 0.3 µs, Maximum 0.6 µs; for word operations: Typical 1 µs; for floating-point arithmetic: Typical 50 µs, etc.

Q7: How many DB, FB, FC, and OB blocks can be used with this CPU?

A7: The CPU supports a maximum of 127 DB, 128 FB, 128 FC, and 128 OB blocks, each with a maximum size of 8 Kbyte.

Q8: What communication interfaces are available with the 6ES7314-1AE04-0AB0 CPU?

A8: The CPU features an MPI interface, supporting PG/OP communication, global data communication, S7 basic communication, and S7 communication. It can connect to various devices via the MPI interface.

Q9: Can the CPU be programmed in different languages?

A9: Yes, the CPU supports multiple programming languages, including LAD (Ladder Diagram), FBD (Function Block Diagram), STL (Structured Text), SCL (Structured Control Language), and GRAPH.

Q10: What software is used for programming this CPU?

A10: Programming is done using the STEP 7 software, with versions V5.0 and V5.0 SP1 supported.

Q11: What is the maximum cable length for the MPI interface?

A11: The MPI interface allows a cable length of a maximum of 9,100 m. Without repeaters, it is 50 m, and with 2 repeaters, it is 1100 m. Fiber optic cable connections extend up to 23.8 km.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6ES7314-1AE04-0AB0, take a look at more from our CPUs line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 6ES7314-1AE04-0AB0 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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