Product Overview
The 6AG1315-2FJ14-2AB0 is Siemens’ SIPLUS (ruggedized) variant of the S7-300 CPU 315F-2PN/DP, built on the standard 6ES7315-2FJ14-0AB0 base silicon but upgraded with conformal coating and an extended temperature envelope of –25 °C to +60 °C (–40 °C storage), making it the go-to S7-300 F-CPU for chemical plants, offshore skids, outdoor pumping stations, and rail-vehicle applications where the standard 6ES7 version (0…+60 °C coated-only, no SIPLUS coating) would be marginal. The “F” in the model denotes fail-safe capability — the 6AG1315-2FJ14-2AB0 executes safety programs under SIMATIC Distributed Safety V5.4 SP4 (or TIA Portal Safety for newer engineering stacks) and can run PROFIsafe telegrams to F-I/O modules alongside standard S7-300 logic in the same rack . This dual personality — standard PLC + safety controller in one 80 mm S7-300 width — is why plants standardize on the 6AG1315-2FJ14-2AB0 for SIL-rated loops (emergency shutdown, fire & gas vote, press safety curtain) without adding a separate F-controller.
Architecturally, the 6AG1315-2FJ14-2AB0 carries two communication interfaces: Port 1 is the classic S7-300 combo MPI/PROFIBUS DP at up to 12 Mbps, acting as DP Master (max 124 DP slaves) or DP Slave; Port 2 is a 2-port PROFINET IO switch (RJ45) that operates simultaneously as IO Controller, IO Device, and PROFINET CBA — meaning the same CPU can sit as master to an IM155-6 PN remote rack while also being a subordinate IO Device to a higher-level S7-1500 or PCS 7 OS via PN. Work memory is 512 KB (non-expandable), load memory lives on a removable Micro Memory Card (MMC) up to 8 MB (MMC not included — must be ordered separately, a frequent first-time miss). Processing performance is 0.05 µs/bit, 0.09 µs/word, 0.12 µs/fixed-point, 0.45 µs/float — solid mid-tier for a 315-class, sufficient for ~1–2 k I/O and moderate PID/Safe blocks .
Power is 24 V DC (20.4–28.8 V range, 750 mA rated, 4.65 W typical loss), with 5 ms ride-through on DC sag and no battery requirement — the MMC carries program + retentive data (maintenance-free, 10-year data hold). The 6AG1315-2FJ14-2AB0 is a PM400 phase-out item (product discontinued since 1 Oct 2023) but remains fully serviceable; Siemens still supplies spares and supports Distributed Safety projects on it. For plants with existing S7-300 F-racks (chemical batch, pharma skid, water-treatment safety loops, rail signaling), the 6AG1315-2FJ14-2AB0 is the correct coated spare; for new builds, Siemens steers toward SIPLUS S7-1500 F-CPUs, but the 6AG1 version keeps legacy S7-300 F-systems running through their remaining 10–15 year life.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6AG1315-2FJ14-2AB0 |
| Manufacturer | Siemens AG |
| Product Type | SIPLUS S7-300 CPU 315F-2PN/DP (Fail-Safe Central Processing Unit) |
| Base Reference | Based on 6ES7315-2FJ14-0AB0, with conformal coating |
| Supply Voltage | 24 V DC (20.4–28.8 V range) |
| Current Consumption | 750 mA (rated), 150 mA (no-load), 4 A inrush |
| Power Loss | 4.65 W (typ.) |
| Work Memory | 512 KB (integrated, non-expandable) |
| Load Memory | Plug-in MMC, max 8 MB (MMC not included) |
| Retentive Data | 128 KB (via MMC, maintenance-free, 10 yr hold) |
| Bit Operation Time | 0.05 µs |
| Word / Fixed / Float | 0.09 µs / 0.12 µs / 0.45 µs |
| I/O Address Area | 2048 B input / 2048 B output |
| Process Image | 2048 B in / 2048 B out (adjustable) |
| Counters / Timers | 256 S7 counters, 256 S7 timers (IEC counters/timers present) |
| Total S7 Blocks | 1024 (DB/FC/FB combined; max block size 64 KB) |
| Interface 1 | MPI / PROFIBUS DP, RS485, 12 Mbps; DP Master (≤124 slaves) + DP Slave |
| Interface 2 | PROFINET IO, 2× RJ45 (integrated switch); IO Controller + IO Device + CBA simultaneous |
| Max Connections (total) | 16 (PG/OP, S7, Open IE: TCP/ISO-on-TCP/UDP 8 each) |
| Operating Temperature | –25 °C to +60 °C (–25…+55 °C T1 per EN50155 rail use) |
| Storage Temperature | –40 °C to +70 °C |
| Coating | Conformal coating (SIPLUS ruggedized) |
| Engineering | STEP 7 V5.5+, Distributed Safety V5.4 SP4 (F-function) |
| Dimensions (W×H×D) | 40 mm (1 rack unit) × 147 mm × 129 mm (S7-300 standard) |
| Weight | 0.399 kg |
| PLM Status | PM400 – Announcement of product phase-out (since 1 Oct 2023) |
| Origin | Germany |
Main Features and Advantages
SIPLUS Coating + –25 °C Cold-Start. The biggest differentiator of the 6AG1315-2FJ14-2AB0 vs. the standard 6ES7315-2FJ14-0AB0 is the SIPLUS treatment: conformal coating on the PCB, –25 °C low-end (vs. 0 °C on the 6ES7), and a build validated for condensing humidity, salt mist, and H2S/SOx environments that would haze a standard S7-300 within 3–5 years. For offshore platforms, chemical-plant batch areas (acid vapor), and rail-side signaling cabinets (–20 °C winter startup), the 6AG1315-2FJ14-2AB0 is the S7-300 F-CPU you’re allowed to specify. The EN50155 variant (6AG1315-2FJ14-2AY0) pushes the rated envelope to T1 class for on-board rail use — same base silicon, different coating/thin-spec.
F-CPU in One S7-300 Slot. The “F” means the 6AG1315-2FJ14-2AB0 runs two program containers: the standard OB1 cyclic + FBs/FCs for normal process, and the F-runtime (F-OBs, F-DBs, F-FBs) certified to IEC 61508 / EN ISO 13849 for SIL3 / PL e loops. In practice this means a single S7-300 rack can run the batch recipe and the ESD/F&G vote without a second F-controller — the 6AG1315-2FJ14-2AB0 handles PROFIsafe F-I/O on both DP and PN interfaces. For S7-300 plants that added safety loops after the original rack was built (very common in 2008–2018 vintage batch plants), swapping a standard 315-2PN/DP for the 6AG1315-2FJ14-2AB0 (pin-compatible, same rack position) is the upgrade path — no rewiring, just add Distributed Safety license + F-I/O.
Dual-Interface: MPI/DP + PN 2-Port Switch. Interface 1 keeps the S7-300 legacy alive — MPI to a local OP/panel or PG, DP 12 Mbps to ET 200M (classic) remote I/O, or DP-Slave to a higher-level S7-400/1500. Interface 2 is a 2-port PN switch, so you can daisy-chain the 6AG1315-2FJ14-2AB0 into a line-topology PN cable run without an external switch — useful in skid-mounted plants where the S7-300 sits on a local panel and the PN trunk runs past it to the next skid. Simultaneous IO Controller + IO Device means the same CPU can master an IM155-6 PN rack (ET 200SP remote I/O) while presenting itself as a PN device to a PCS 7 OS or S7-1500 supervisor — handy in migration scenarios where the S7-300 isn’t ready to be ripped out but the plant DCS wants PN-IO visibility.
MMC-Based, Battery-Free. The 6AG1315-2FJ14-2AB0 ditches the S7-300 classic battery model — program + retentive DBs live on the MMC, and the 10-year data hold is guaranteed by the card, not by a 3 V lithium that dies in 2–3 years. For remote sites (pump stations, offshore, rail-side) where nobody checks the battery calendar, this is a reliability win. The trade: MMC is not included with the CPU — you must order a 6ES7953-8LX00-0AA0 or similar MMC (size to your load — 512 KB WRK + retentive data + load store; 2–4 MB MMC is typical, 8 MB max). A cold-spare 6AG1315-2FJ14-2AB0 on the shelf should include a cloned MMC so it’s a 5-minute rack-swap, not a “find the PG and download” event.
Performance Mid-Tier, F-Certified. 0.05 µs/bit and 0.45 µs/float puts the 6AG1315-2FJ14-2AB0 squarely in the S7-300 315-class sweet spot — enough for 1–2 k I/O, 10–20 PID loops, and a safety program with 50–100 F-blocks. It won’t touch an S7-400/1500 for scan-load, but that’s not the lane — the lane is “S7-300 rack that needs F, needs coating, and needs PN/DP dual-stack.” If your scan is creeping above 20 ms with F-blocks active, that’s the signal to migrate to S7-1500 SIPLUS, not to up-size within 6AG1.
PM400 Phase-Out — Honest Status. The 6AG1315-2FJ14-2AB0 is announced phased-out since Oct 2023. Siemens still supports spares, but lead time from the factory is ~35 days and allocation can tighten. For plants running 5+ of these CPUs, the prudent move is: (a) stock 1 cold-spare per 4–5 installed CPUs, (b) clone MMCs, (c) start the S7-1500 SIPLUS migration plan for the next major outage. The description below treats the 6AG1315-2FJ14-2AB0 as a spares/legacy-keepalive product, which matches the buyer profile for 6AG1 codes in 2025+.