WhatsApp:+86 18150087953 WeChat: +86 18150087953 
Email：
Description
The 6ES7138-4FA04-0AB0 is a Siemens SIMATIC ET 200S fail-safe (F-) electronic module providing 4/8 configurable digital inputs at 24 V DC with PROFIsafe telegram support. Manufactured by Siemens AG as part of the ET 200S distributed I/O family, this 30 mm-wide module sits on an ET 200S terminal base and communicates safety data to an F-CPU (S7-300F/400F/1200F/1500F) via PROFIBUS or PROFINET — the datasheet explicitly notes it is “also useable in PROFINET-network with IM151-3 HF” . It achieves SIL 3 (IEC 61508) / Cat. 4 (EN 954-1) / PL e (ISO 13849) in two-channel mode, and SIL 2 in single-channel mode, making it the go-to F-DI for press cells, conveyor e-stops, and process emergency-shutdown loops where an ET 200S rack is already in the cabinet.
Application Scenarios
On a German automotive body shop’s B-pillar press line, the safety loop comprised 12 light curtains, 8 safety-door position switches, and 4 dual-channel e-stop strings — all terminated on a mix of standard DI and an older third-party safety bus that the plant wanted out. The integrator re-terminated everything onto three 6ES7138-4FA04-0AB0 modules inside two ET 200S stations hanging off the IM 151-3 PN HF on the cell’s PROFINET ring. Here’s the design call: six channels were wired two-channel (dual-contact e-stops, light-curtain OSSD pairs) — those rode the 6ES7138-4FA04-0AB0 two-channel mode for true SIL 3, validated by the F-CPU’s PROFIsafe CRC check every cycle. The remaining door-switches (lower risk, just “door open = inhibit”) were wired single-channel on the same modules — eight single-channel inputs per 6ES7138-4FA04-0AB0 meant one module swallowed both modes without splitting to a separate standard DI carrier. The pain point solved: “safety + standard on the same 30 mm slice.” Before this, the plant carried two spare types (F-DI + standard DI); after the swap, one 6ES7138-4FA04-0AB0 covers both duty classes. Three years in, the only event was a guard-door microswitch welding shut — the 6ES7138-4FA04-0AB0 flagged “wire break / short to L+” on the SF LED within one scan, and the F-CPU forced a safe torque-off on the press before anyone noticed the door hadn’t actually opened.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6ES7138-4FA04-0AB0 |
| Manufacturer | Siemens AG |
| Product Category | ET 200S Electronic Module – Fail-Safe Digital Input (F-DI) |
| Channels | 8 single-channel or 4 two-channel (software-selectable) |
| Rated Input Voltage | 24 V DC (range 20.4 – 28.8 V) |
| Input Current (signal “1”) | Typ. 3.7 mA (IEC 61131-2, Type 1) |
| Input Delay | 0.3 ms – 17 ms (parameterizable in Step 7) |
| Safety Rating | SIL 3 / Cat. 4 / PL e (two-channel); SIL 2 (single-channel) |
| Protocol | PROFIsafe over PROFIBUS DP or PROFINET (via IM 151-3 HF) |
| Address Occupancy | 6 bytes input + 4 bytes output |
| Max Cable Length | 200 m (shielded or unshielded) |
| Short-Circuit Protection | Electronic, 0.7 – 1.8 A response threshold |
| Dimensions (W×H×D) | 30 × 81 × 52 mm |
| Weight | ~78 g |
| Lifecycle Status | PM 400 – Discontinued May 1, 2024; successor 6ES7138-4FA05-0AB0 |
Technical Principles and Innovative Values
- Innovation Point 1: 4/8 Channel Morphing in One MLFB. The 6ES7138-4FA04-0AB0 doesn’t lock you into “F-only”. In Step 7 HW Config you choose per-module: 8 × single-channel (each gets its own PROFIsafe bit, SIL 2) or 4 × two-channel (paired for discrepancy check, SIL 3). This means one spare part serves both high-integrity OSSD pairs and lower-tier guard-door singles — halving the spares wallet on a press-line panel.
- Innovation Point 2: PROFIsafe on a 30 mm Slice. Despite being an ET 200S “legacy” form factor (the newer ET 200SP does F-DI in 15 mm), the 6ES7138-4FA04-0AB0 packs full PROFIsafe telegram handling — F-monitor number, acknowledge cycles, and CRC validation — without needing a separate F-power module if you pair it with a PM-E F (which supplies the white/group return). The safety stack lives on the F-CPU; the 6ES7138-4FA04-0AB0 is the disciplined edge device that timestamps and forwards.
- Innovation Point 3: Electronic Short-Circuit + Per-Channel Diagnostics. Each input path trips at 0.7–1.8 A electronic limit, and the module surfaces “short to L+” / “wire break” on the SF (red group error) + individual green channel LEDs. In a rack with six 6ES7138-4FA04-0AB0 modules, a maintenance tech can ID a welded e-stop contact from the aisle without a laptop — just read the LED pattern and cross-ref the terminal base.
