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Beckhoff EL1904 | EtherCAT Terminal 4× DI 24V DC, 2ms Filter, 1-Wire, IP20 — Safety-Related Option Available
Beckhoff EL1904 EtherCAT digital input terminal — 4 × 24 V DC inputs (IEC 61131-2 Type 1/3), 2 ms filter, 500 V isolation, 12 mm width. For use with BK/EK series couplers. EL1904 = std. DI; EL1904 with -xxxx safety option = safe DI per EN ISO 13849-1.
Product Overview
The Beckhoff EL1904 (Art. No. EL1904 | often quoted as EL1904-0000 meaning no special option / standard version) is an EtherCAT digital input terminal providing four electrically isolated 24 V DC inputs (sink/source — Type 1 / Type 3 per IEC 61131-2) for connection to the Beckhoff EtherCAT I/O system (EK1100 coupler or CX series embedded PCs with E-bus). Each input has a 2 ms (typical) debounce filter and the terminal draws its logic power from the E-bus (no external 24 V auxiliary needed for electronics). Signals are scanned at EtherCAT cycle time and transmitted in the process image. The EL1904 occupies 4 bits (1 byte) in the input process image. Width is 12 mm (standard EtherCAT terminal format). Also available as EL1904 with safety option (e.g. EL1904-0000 with -SIL or as EL1904 in TwinSAFE SC context) — base hardware is identical; TwinSAFE functionality is enabled via configuration and FSoE (Fail Safe over EtherCAT) when used with EL6910 or other TwinSAFE Logic Terminals.
Technical Specifications (Electrical & I/O)
Parameter
Specification
Article / Order Code
EL1904-0000 (EL1904 standard digital input terminal, no option — "0000" = default)
Series
Beckhoff EtherCAT I/O — EL Series (E-bus coupler compatible)
Number of Channels
4 × Digital Input (DI), 24 V DC
Input Type
IEC 61131-2 Type 1 / Type 3 — Sink (NPN) or Source (PNP) wiring accepted (common 0 V or +24 V per channel group)
Rated Input Voltage
24 V DC (Range 15 … 30 V DC)
Logic Level "1" (ON)
≥ 15 V DC @ typ. 3 mA
Logic Level "0" (OFF)
≤ 5 V DC
Input Current (typ. @ 24 V)
3 mA per active channel
Input Filter Time (Hardware)
Typ. 2 ms (debounce / noise rejection) — software filter settable in TwinCAT (extendable)
Solid: 0.08–2.5 mm² / Stranded with ferrule: 0.08–1.5 mm²
Power Supply for Electronics
From E-bus (≤ 90 mW typ.) — no external 24 V aux for terminal logic
Sensor Supply (Optional Use)
User typically wires 24 V DC from external PS to terminal's sensor supply terminals (not consumed by EL1904 — pass-through)
Process Image Size
4 bits (1 byte) input — mapped in TwinCAT automatically
Distributed Clocks
Supported — input timestamping possible when configured
Mounting
35 mm DIN Rail (EN 60715 / TS 35) — snap-on with locking lever
Operating Temp.
0 … +55 °C (storage -25 … +85 °C)
Degree of Protection
IP20 (installed in cabinet)
Weight (Approx.)
55 g
Certifications
CE, UL 508, cULus, EAC, KC, RoHS / REACH
TwinSAFE Capable
Base EL1904 can be used as FSoE Safe Input when paired with TwinSAFE Logic Terminal (EL6910 / EL6900) — requires FSoE license & configuration; hardware itself is not a safety controller
Key Features
Compact 4 DI in 12 mm: High-density EtherCAT I/O — minimizes cabinet width per point vs. older KL series (24 mm).
E-bus Powered Electronics: No auxiliary 24 V wiring to the terminal itself — only field 24 V DC for sensors.
2 ms Debounce Filter: Rejects contact bounce and electrical noise from relays/prox switches — configurable in software for longer filter times.
PNP/NPN Universal: Accepts both sourcing and sinking sensor wiring — one part covers most panel standards.
TwinSAFE FSoE Ready (with Logic Terminal): Same hardware can serve as safe input (up to SIL 3 / PL e) when used in a TwinSAFE FSoE network — no separate safety DI terminal needed for small systems.
Typical Applications
Machine Control I/O Rack: Read limit switches, E-STOP (via safety relay / TwinSAFE), pushbuttons, and prox sensor states into Beckhoff CX or EK1100+E-bus coupler.
Packaging / Converting Lines: High-speed DI acquisition synchronized via EtherCAT Distributed Clocks — suitable for registration marks or encoder Z-pulse (when using EL1262 high-speed DI; EL1904 covers general-purpose DI).
Process Skid Distributed I/O: Compact EtherCAT node near field devices — less wiring vs. central parallel cabling.
TwinSAFE Pilot Projects: Start with EL1904 as standard DI; later activate FSoE inputs with TwinSAFE Logic Terminal — no hardware change needed.
Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.
Frequently Ask & Questions
Are preferential prices available?
Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.
Are the Products Genuine OEM Units?
Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.
How will you arrange shipment?
We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.
What is the warranty of goods?
One-year Warranty.
How long is the logistics cycle of the product?
Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Agent,Importer,Trading Company
Year Established:
2012
Total Annual:
2000000-3000000
Employee Number:
>50
Ecer Certification：
Verified Supplier
A Decade of Global Excellence in Electromechanical Trade
ACH established in 2012 with offices in Shenzhen and Hong Kong, is a high-efficiency multi-brand distributor of industrial automation products.
We specialize in supplying world-leading brands such as Bradley,,E... A Decade of Global Excellence in Electromechanical Trade
ACH established in 2012 with offices in Shenzhen and Hong Kong, is a high-efficiency multi-brand distributor of industrial automation products.
We specialize in supplying world-leading brands such as Bradley,,E...
