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Brand: ABB
ABB FEN-01 TTL Encoder Interface Module
Description
FEN-01: two TTL encoder inputs for ABB drives
The FEN-01 is ABB’s TTL Encoder Interface, an option module that gives a compatible ABB drive up to two TTL encoder connections. Per ABB’s manual 3AFE68784603 Rev F, one input carries commutation signals and PTC thermistor support, and the module adds a TTL encoder output for emulation and two digital latch inputs. It is the choice when the motor already has a standard incremental encoder with RS-422 signals and no absolute or resolver feedback is needed.
Technical specifications
| Parameter | Specification |
|---|---|
| Type designation | FEN-01 |
| Module type | TTL encoder interface |
| Encoder input X31 | TTL, 500 kHz, RS-422/485 differential |
| Encoder input X32 | TTL with commutation U, V, W and PTC |
| Position resolution | 24 bits (about 16 M per revolution) |
| Speed range | -32768 to 32767 rpm |
| Encoder supply X31 | 5.5 V at 180 mA; 24 V at 150 mA |
| Encoder supply X32 | 5.5 V at 200 mA; 24 V at 150 mA |
| Emulation output | X33, TTL |
| Latch inputs | X34, two inputs |
| Maximum power | 350 mA at 24 V |
| Degree of protection | IP20 |
Two TTL inputs, one with commutation
Input X31 is a plain TTL encoder input with channels A, B and Z, 500 kHz RS-422/485 signals, a 24-bit position resolution and a speed resolution of 0.004 rpm. Input X32 adds the commutation channels U, V and W and a PTC thermistor input, with a supply of 5.5 V at 200 mA or 24 V at 150 mA and a speed resolution of 0.04 rpm, which makes it suitable for permanent magnet motors that need rotor position at start. Cable lengths on both inputs are 30 m for a 5 V encoder, 60 m with two parallel 0.5 mm2 supply cables and 100 m for a 10 to 30 V TTL encoder.
Output, latch inputs and installation
The X33 output emulates the encoder for another controller, and the X34 latch inputs capture position at an external event. A voltage selection jumper X301 sets the encoder supply, a locking tab and fixing screw hold the module in the drive option slot, and the diagnostic LEDs show status. The module draws 350 mA at 24 V, limits the combined encoder, latch and cable load to 5 W, is rated IP20 and follows the drive’s ambient limits. Typical applications are conveyors, extruders, winders and permanent magnet drives where a standard incremental TTL encoder is fitted to the motor; choose the FEN-01 when you need the commutation channels or two encoder inputs, and a different FEN module when the motor has an absolute or resolver sensor.
Related ABB products: ABB FEN-21 Resolver Interface Module, ABB FEN-31 HTL Encoder Interface Module for ABB Drives, ABB RTAC-01 Pulse Encoder Interface Module for ACS800 and ABB FEN-11 Absolute Encoder Interface Module.
Documents and quotation
The data on this page was read from ABB’s user’s manual for the FEN-01, linked here, and from ABB’s product page for the module. Seven Star LLC quotes the FEN-01 from Muscat; send the drive type designation so that compatibility with the option slot and firmware can be checked. Confirm before ordering that the drive, control unit and firmware support this module, and note that older manuals may predate current drive generations. More encoder interfaces are in Encoders; for fieldbus connectivity see the FPBA-01 adapter.
Datasheets & Documents
- Manual ABB FEN-01 TTL encoder interface user's manual (3AFE68784603 Rev F) Download
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About brand
ABB is the Swiss-Swedish engineering group for electrification and automation: low voltage drives, motors, circuit breakers and motor control, process instruments and analysers, control systems and robots. It was formed on 5 January 1988 by the merger of two older companies. ASEA was founded in Västerås, Sweden, in 1883 by Ludvig Fredholm to make electric lighting and generators. BBC Brown Boveri was founded in Baden near Zurich in 1891 by Charles E. L. Brown and Walter Boveri. ABB Ltd is incorporated in Switzerland, headquartered in Zurich and listed on the SIX Swiss Exchange and Nasdaq Stockholm.
ABB company profile
| Formed | 5 January 1988, by the merger of ASEA (Sweden) and BBC Brown Boveri (Switzerland), each holding 50% |
|---|---|
| ASEA | Founded 1883 in Västerås, Sweden, by Ludvig Fredholm; first products electric lighting and generators |
| Brown, Boveri & Cie | Founded 1891 in Baden, Switzerland, by Charles E. L. Brown and Walter Boveri |
| Headquarters | Zurich, Switzerland; ABB Ltd became the group holding company in 1999 |
| Ownership | Public company listed on SIX Swiss Exchange and Nasdaq Stockholm |
| Brands in the group | Baldor (US motors, acquired 2011), B&R (machine automation, acquired 2017), K-TEK level instruments, Endura and Navigator analysers, SACE breakers |
| Product families | Low and medium voltage drives (ACS series), motors, SACE Tmax and Emax breakers, contactors and soft starters, flow, pressure, temperature and level instruments, liquid and gas analysers, Contrac actuators, AC500 PLCs, Ability System 800xA and S800 I/O, protection relays, robots |
Milestones
- 1883: ASEA is founded in Västerås, Sweden.
- 1891: Brown, Boveri & Cie is founded in Baden, Switzerland.
- 1987–1988: The merger is announced on 10 August 1987; ABB Asea Brown Boveri starts operating on 5 January 1988.
- 1999: ABB Ltd, incorporated in Switzerland, becomes the single holding company of the group.
- 2011 and 2017: Baldor Electric and B&R join ABB.
- 2020: ABB sells its power grids business to Hitachi, focusing on electrification, motion, process and machine automation.
Choosing an ABB drive
ABB's ACS drive codes are easy to read once you know the pattern. In ACS580-01-046A-4, "ACS580" is the drive family, "01" means a wall-mounted single drive, "046A" is the rated output current (about 46 A) and "-4" means a 380–480 V supply. The family is chosen by application: ACS355 for compact machinery, ACS310 for simple pumps and fans, ACS580 as the general-purpose drive, ACQ580 for water and wastewater with pump functions such as pipe fill and dry-run protection, and ACS880 for heavy industrial duty with direct torque control. Size the drive on the motor's full-load current, not only its kW rating, and allow derating for the high ambient temperatures common in Gulf electrical rooms.
Where ABB products are used
In Oman and the GCC, ABB drives and motors run pumps, fans and compressors in water and wastewater plants, district cooling, oil and gas and industry. ABB flowmeters, level instruments and analysers are used in water utilities, power and desalination plants and refineries, and SACE breakers protect switchboards in buildings and plants.
ABB products we list
| Family | Examples |
|---|---|
| AC drives | ACS580, ACS580-01-046A-4, ACQ580, ACS355, ACS310, ACS880-01, FEN-31 encoder module |
| Breakers, motor control and protection | SACE Tmax XT, XT3N 250, SACE Emax 2, AF09 contactor, PSR soft starter, REM615 relay |
| Flow measurement | ProcessMaster FEP300, AquaMaster4, CoriolisMaster FCB430, VortexMaster FSV430, SwirlMaster FSS430, OriMaster FPD500 |
| Pressure, temperature and level | 266DRH, 267CS multivariable, TTH300, K-TEK AT100, LMT200, MT5000 GWR, KM26 gauge |
| Analysers | Endura AZ20, AK100 hydrogen purity, Navigator AW641 silica, AW402 chlorine, AWT210 |
| Control systems and actuators | AC500, AC500-S, S800 AI810, AC 800F SA 811F, Contrac RSD50, Contrac RHD4000 |
Ordering ABB products: what we need
Send the full type code from the nameplate (for example ACS580-01-046A-4 or 266DSH...) and, for spare parts, the ABB ID number (such as 3BSE008508R1 or 1SBL176001R3010). For drives, add the motor power and current and any option codes (+...). For instruments, send the complete order code, which sets range, materials and approvals. Baldor motors are listed on their own brand page.
Facts checked against ABB company filings and published histories of ASEA and Brown, Boveri & Cie, October 2026.
FAQ
Questions about the ABB FEN-01 TTL Encoder Interface Module
Answers from our engineering team on installation, compatibility and integration.
01How many encoders can the FEN-01 connect?
Two TTL encoders: X31 for a standard TTL input and X32 for a TTL input with commutation signals and PTC support.
02Does it support commutation signals?
Yes, input X32 carries U, V and W commutation channels together with a PTC thermistor input.
03What cable lengths are allowed?
30 m for a 5 V encoder, 60 m with two parallel 0.5 mm2 supply cables and 100 m for a 10 to 30 V TTL encoder.
04Can it emulate an encoder output?
Yes, the X33 TTL encoder output serves emulation purposes.
05Is the module protected against dust and water?
It is rated IP20 and relies on the drive enclosure for its ambient conditions.
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