Siemens 6ES7314-1AG14-0AB0 CPU 314 | S7-300 PLC Module

6ES7314-1AG14-0AB0 | Siemens SIMATIC S7-300 CPU 314

Product Overview

• Siemens 6ES7314-1AG14-0AB0 is a central processing unit for the S7-300 series.
• It includes an integrated 24 V DC power supply and 128 KB of work memory.
• This CPU requires a Micro Memory Card (MMC) for program and data storage.
• It handles bit operations in just 0.06 µs and floating-point math in 0.59 µs.
• Firmware V3.3 supports STEP 7 V5.5+ or V5.2 with HSP 218.

Key Technical Data

• Brand: Siemens
• Model: 6ES7314-1AG14-0AB0 (CPU 314)
• Supply Voltage: 24 V DC (19.2 … 28.8 V range)
• Current Consumption: 650 mA (typ.), 3.5 A inrush
• Power Loss: 4 W (typical)
• Work Memory: 128 KB integrated (not expandable)
• Load Memory: MMC plug-in, up to 8 MB
• Retentive Data: 64 KB max. (adjustable per DB)
• Processing Times: Bit 0.06 µs, Word 0.12 µs, Fixed 0.16 µs, Float 0.59 µs
• I/O Address Area: 1024 bytes inputs / 1024 bytes outputs
• Digital Channels: 1024 inputs / 1024 outputs (central)
• Analog Channels: 256 inputs / 256 outputs (central)
• Interfaces: 1 × MPI (RS 485), max. 187.5 kbit/s
• Connections: 12 total (PG, OP, S7 basic comm.)
• Ambient Temp: 0 … +60 °C (operation)
• Dimensions: 40 × 125 × 130 mm (W×H×D)
• Weight: approx. 280 g

Memory & Data Management

• Work memory: 128 KB fixed; MMC load memory up to 8 MB.
• Retentive data: 64 KB max.; adjustable per data block.
• Data backup: MMC retains data for 10 years (minimum).
• Counters: 256 S7 counters + unlimited IEC counters (SFB).
• Timers: 256 S7 timers + unlimited IEC timers (SFB).
• Flags: 256 bytes (MB 0‑255), retentive preset MB 0‑15.
• Local data: 32 KB per priority class (2 KB per block).

Blocks & Programming

• Total blocks: 1024 (DBs, FCs, FBs) – max. depends on MMC.
• DB: max. 1024, up to 64 KB each.
• FB & FC: max. 1024 each, up to 64 KB each.
• OB types: Free cycle (OB1), time alarm (OB10), delay (OB20,21), cyclic interrupt (OB32‑35), process alarm (OB40), startup (OB100), async/sync errors.
• Nesting depth: 16 per priority class, +4 within error OB.
• Programming languages: LAD, FBD, STL, SCL, CFC, GRAPH, HiGraph.
• Know‑how protection: Password and block encryption (S7 Block Privacy).

Communication Functions

• • MPI interface: 187.5 kbit/s max. for PG/OP and global data.
  • Global data: 8 loops, 8 packets, 22 bytes max. per packet.
  • S7 basic communication: 76 bytes per job (X_SEND/X_RCV).
  • S7 communication: Server only (PUT/GET), 180 bytes per job.
  • Connections: 12 total; PG (11), OP (11), S7 basic (8) configurable.
  • Routing & data record routing: Not supported.

Diagnostics & Commissioning

• • • Diagnostic buffer: 500 entries, 100 power‑fail‑proof.
    • Status/control: 30 variables (inputs, outputs, flags, DB, timers).
    • Forcing: 10 variables (inputs, outputs) max.
    • Breakpoints: 4; single‑step and status block available.
    • Service data: Read‑out supported.

Installation & Expansion

• • • Mounts on standard S7‑300 rail; 40 mm width.
    • Max. 3 expansion units (racks), 4 racks total.
    • Up to 8 modules per rack.
    • Supports up to 8 FMs, 8 PtP CPs, 10 LAN CPs.
    • External protection: 2 A min. fuse recommended for supply line.

Certifications & Environmental

• • • Operating temperature: 0 … +60 °C.
    • Hardware functional status: 01; Firmware: V3.3.
    • Complies with Siemens industrial standards for EMC and safety.
    • Designed for indoor control cabinets (IP20 protection).

Package Contents

• • • 1 × CPU 314 (6ES7314-1AG14-0AB0) module
    • Product information sheet and manual (digital download)
    • MMC not included – order separately
    • 12‑month warranty certificate

Shipping & Delivery

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

Expert Review

• • • “The CPU 314 is a workhorse for small to medium automation tasks. Its 0.06 µs bit processing and 128 KB memory handle most machine control needs. The MMC backup is a lifesaver.” — Senior Controls Engineer, PowergearX

Manager’s Insight

• • • “For upgrades, this CPU offers a balanced price‑performance ratio. We use it in packaging lines and conveyor systems. The integrated MPI simplifies troubleshooting with a PG.” — Product Manager, Industrial Automation

Typical Applications

• • • Machine control (packaging, conveying, textile).
    • Small to mid‑size process skids.
    • Retrofit of older S7‑300 systems.
    • Educational and training labs for PLC programming.

Frequently Asked Questions

• • • What memory card does this CPU need?
    • It requires a Micro Memory Card (MMC) – not included.
  • • Can I use it with TIA Portal?
    • No, this CPU works only with STEP 7 Classic (V5.5+).
  • • How many digital I/O points can I connect?
    • Up to 1024 digital inputs and 1024 digital outputs (central).
  • • Is the clock battery‑backed?
    • No battery; clock runs on supercap (6 weeks backup at 40 °C).
  • • Experience tip: Always use a licensed MMC from Siemens – third‑party cards may cause startup failures.
    • For large programs, compress your code to fit within 128 KB work memory.

Selection Guide

• • • Choose CPU 314 for mid‑range performance with 128 KB memory.
    • For smaller needs, consider CPU 312 (32 KB) or CPU 313 (64 KB).
    • For more I/O and speed, upgrade to CPU 315‑2 DP (with PROFIBUS).
    • Verify your programming software version – STEP 7 V5.5+ is required.
    • Always order an MMC separately (e.g., 6ES7953‑8LF30‑0AA0 for 64 MB).

Compare with Similar Models

• • • CPU 312 (6ES7312‑1AE14‑0AB0) – smaller memory, lower cost.
    • CPU 315‑2 DP (6ES7315‑2AH14‑0AB0) – integrated PROFIBUS DP.

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