Siemens 6ES7312-1AE14-0AB0 CPU 312 | S7-300 Controller 32KB

6ES7312-1AE14-0AB0 | Siemens SIMATIC S7-300 CPU 312

Product Overview

• Siemens 6ES7312-1AE14-0AB0 is a compact CPU for small to mid‑sized control tasks.
• It includes 32 KB of integrated work memory and needs a Micro Memory Card (MMC).
• This CPU handles bit operations in just 0.1 µs – fast and reliable.
• It works with STEP 7 V5.5 + SP1 or higher (or V5.2 + SP1 with HSP 218).

Key Technical Data

• Brand: Siemens
• Model: 6ES7312-1AE14-0AB0 (CPU 312)
• Supply Voltage: 24 V DC (19.2 … 28.8 V)
• Current Consumption: 650 mA (rated), 140 mA (no‑load)
• Inrush Current: 3.5 A (I²t = 1 A²·s)
• Power Loss: 4 W (typical)
• Work Memory: 32 KB (integrated, not expandable)
• Load Memory: MMC up to 8 MB (data retention min. 10 years)
• Processing Times: Bit 0.1 µs | Word 0.24 µs | Fixed 0.32 µs | Float 1.1 µs
• I/O Address Area: 1024 bytes each for inputs and outputs
• Digital Channels: 256 inputs / 256 outputs (central)
• Analog Channels: 64 inputs / 64 outputs (central)

Memory & Blocks

• Total Blocks: 1024 (DBs, FCs, FBs)
• DB / FB / FC / OB Size: max. 32 KB each
• Counters (S7): 256 (retentive adjustable)
• Timers (S7): 256 (10 ms … 9990 s)
• Retentive Data: max. 32 KB (MB 0‑255 adjustable)
• Clock Memories: 8 (1 memory byte)

Interfaces & Communication

• MPI Port: 1 x RS‑485 (max. 187.5 kbit/s)
• PG/OP Communication: 5 connections (adjustable)
• S7 Basic Communication: 2 connections (max. 76 bytes/job)
• S7 Communication: Server only (PUT/GET, 180 bytes/job)
• Global Data: 8 GD loops, 22 bytes/packet
• No PROFINET or PROFIBUS DP (use CP for fieldbus)

Diagnostics & Commissioning

• Diagnostic Buffer: 500 entries (100 power‑fail proof)
• Status/Control: Max. 30 variables (14 control)
• Forcing: 10 variables (inputs/outputs)
• Breakpoints: 4 (single step available)
• Service Data: Readable online

Environmental & Physical

• Operating Temp: 0 … +60 °C
• Dimensions: 40 x 125 x 130 mm (W x H x D)
• Weight: approx. 270 g
• Protection: IP20 (DIN rail mount)

Installation & Compatibility

• Mounts on S7‑300 rail (max. 1 rack, 8 modules per rack).
• Requires MMC for program and data backup (no battery).
• Supports up to 8 FMs and 4 LAN CPs (recommended).
• No expansion units – standalone CPU for small systems.

Certifications & Standards

• CE, UL, and CSA approved for industrial use.
• RoHS compliant.
• Software clock with ±2 s/day deviation (typ.).

Package Contents

• 1 × CPU 312 (6ES7312-1AE14-0AB0)
• Front connector (screw type)
• Labeling strips and manual
• 12‑month warranty card

Shipping & Delivery

• Dispatch: 12‑24 hours from order.
• Carriers: FedEx, UPS, DHL express.
• Tracking available within 24 hours.

Expert Review

• “The CPU 312 is a workhorse for simple automation. Its 32 KB memory and fast bit processing handle small machines perfectly. The MMC backup is a lifesaver – no battery worries.” — Senior Controls Engineer, PowergearX

Manager’s Insight

• “For cost‑sensitive projects, this CPU offers Siemens quality at a low entry price. Pair it with an MMC (up to 8 MB) and you have a robust solution for conveyor or packaging lines.” — Product Manager, Industrial Automation

Typical Applications

• Small conveyor systems and material handling.
• Packaging machines and labeling equipment.
• Fan, pump, and valve control in compact plants.
• Educational training systems and lab automation.

Frequently Asked Questions

• Does this CPU include a memory card?
• No, the MMC is sold separately (max. 8 MB).

• Can I expand the work memory?
• No, 32 KB is fixed. Use MMC for load memory only.

• How many digital I/O points can I connect?
• Up to 256 inputs and 256 outputs (central).

• Is PROFIBUS DP supported?
• No, you need an external CP for DP or PN.

• Experience tip: Always use a 2 A external fuse on the 24 V supply. This protects the CPU from voltage spikes.
• For programming, use STEP 7 V5.5 SP1 or higher – older versions may not detect the CPU.

Selection Guide

• Choose CPU 312 if your application needs up to 256 I/O and simple logic.
• For more memory or DP, consider CPU 314 or 315‑2 DP.
• Check total current: CPU draws 650 mA, plus modules.
• MMC size: 2 MB is enough for most small programs.

Compare with Similar Models

• 6ES7312-1AE13-0AB0 – older version, less memory.
• 6ES7314-1AG14-0AB0 – more memory and DP master.
• 6ES7315-2AH14-0AB0 – high‑end with PN interface.

Contact Inquiries: sales@powergearx.com | +86 18030005825 (WhatsApp)

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