Nittan Evolution EV-2I1O Dual Input / Single Output Loop Module — An Introduction
Nittan Evolution EV-2I1O(F16-82260) is a compact, loop-powered addressable interface module engineered for Evolution analogue addressable loops. Designed primarily for fire detection and access-control systems, the EV-2I1O provides two supervised Class B inputs and a single monitored dry-contact relay output. The module’s integral negative-line short-circuit isolator preserves loop communication in a fault condition, and its selectable failsafe relay mode makes it suitable for door-release applications. With EN54-17 and EN54-18 certification, low quiescent current and compatibility with standard UK pattress mounting, the EV-2I1O is positioned as a reliable in-loop solution for new installations and retrofits.
- Loop powered (20–38 Vdc) with very low quiescent current (720 µA).
- 2 supervised Class B inputs (monitored for normal/open/short; EOL 10 kΩ).
- 1 dry-contact relay output rated 5 A @ 240 Vac (or 5 A @ 30 Vdc).
- Integral negative-line short-circuit isolator (self-resetting) to maintain loop integrity.
- EEPROM addressing (1–254) programmable via EV-AD2 programmer; multi-colour LEDs for status.
- Fits standard UK 2-gang pattress (European flush option available) and carries EN54-17 / EN54-18 approvals.
Detailed specifications and benefits
The EV-2I1O’s specification set is tailored to meet the practical needs of installers and system designers who require robust performance from field devices. Below are the key technical specifications and the benefits they deliver in real-world installations.
- Model / Part No.:EV-2I1O / F16-82260
- Standards / Approvals:EN54-17 (short-circuit isolators) and EN54-18 (input/output devices); CPR certificate & Declaration of Performance.
- Loop Voltage:20–38 Vdc — compatible with standard analogue addressable loops.
- Quiescent Current:720 µA — low standing current preserves loop capacity for other devices.
- Alarm Current:5.5 mA;Current in Short Circuit:15 mA.
- Inputs:2 × Class B supervised inputs (EOL 10 kΩ; recommended alarm resistors 470/680 Ω).
- Output:1 × dry-contact relay rated 5 A @ 240 Vac (or 5 A @ 30 Vdc), suitable for controlling door releases or signalling to external equipment.
- SCI Parameters:Vso 11–14 Vdc; Vsc 3–10 Vdc; max line current 500 mA; max switching 1500 mA; max leakage 15 mA.
- Addressing:EEPROM addressable 1–254 via EV-AD2 programmer.
- LED Indicators:Polling, input, output, fault and SCI status LEDs to aid commissioning and fault-finding.
- Wiring / Terminal Capacity:0.75–2.5 mm².
- Operating Environment:−10 °C to +55 °C; storage −40 °C to +80 °C; up to 95% RH non-condensing.
- Material & Weight:PC/ABS housing, ≈ 175 g.
- Mounting:Fits standard UK 2-gang pattress; European flush version available.
- Low quiescent current:Conserves loop power and allows more devices per loop — important for larger systems or where loop device counts are constrained.
- Integral short-circuit isolator:The negative-line SCI keeps the rest of the loop communicating during a wiring short, improving system resilience and reducing unnecessary system-wide failures.
- Supervised inputs:Inputs are monitored for normal, open and short conditions, enabling reliable detection for manual call points, tamper switches or other field devices.
- High-capacity relay:A 5 A relay rating allows direct switching of many door releases and auxiliary loads without the need for additional contactors in many installations.
- Failsafe selectable:Built-in failsafe via DIP switch offers added flexibility for safety-critical door-release applications.
- EN54 certification:Compliance with EN54-17/18 means the device meets recognised European standards for life-safety systems, easing acceptance in regulated projects.
Use cases and scenarios where the EV-2I1O excels
The EV-2I1O is designed for situations where reliable supervised inputs and a robust monitored output are required inside an addressable loop. Typical scenarios include:
Use the two supervised inputs to monitor manual call points, beam fault outputs, or monitor-zone interfaces (tamper, fault, reset). The supervised inputs’ open/short detection aids rapid fault diagnosis and compliance with fire-safety installation standards.
The module’s 5 A relay and selectable failsafe option make it ideal for controlling electric door releases directly from the fire system or for interface with access-control panels. In panic escape or secure egress designs, the selectable failsafe behaviour ensures the system meets site-specific safety policies.
Because the EV-2I1O fits a standard UK 2-gang pattress and is loop-powered, it is well suited to retrofit jobs where minimal rewiring and compact footprint are priorities. For new builds, the low quiescent current and built-in SCI simplify loop design and improve overall reliability.
Beyond fire systems, the supervised inputs can monitor equipment status, door contacts, or process interlocks; the relay can be used to drive alarm annunciators, door magnets or to signal external control systems.
Comparisons with similar products on the market
Addressable interface modules are available from many manufacturers, with various configurations (single input, multiple inputs, outputs with different ratings, modules with or without integrated isolators). The EV-2I1O’s strengths relative to typical alternatives include:
- Integrated negative-line short-circuit isolator:Some low-cost modules omit SCIs or require separate isolator devices. The EV-2I1O’s built-in SCI reduces component count and simplifies wiring while protecting loop communications.
- Two supervised inputs plus a monitored relay:Many modules provide only one supervised input or unmonitored outputs. The EV-2I1O’s combination allows it to replace multiple single-function devices, saving space and addresses on the loop.
- EN54-17/18 compliance:Not all interface modules carry both EN54 isolator and I/O approvals. The dual EN54 certification supports use in regulated life-safety systems across Europe.
- Low quiescent current:Compared with older or higher-power modules, the EV-2I1O’s low quiescent draw helps maximise loop device counts without exceeding panel limitations.
- User-friendly commissioning:EEPROM addressing via EV-AD2 and visible LEDs simplify commissioning and troubleshooting compared with devices that require more complex addressing tools or have fewer status indicators.
There are trade-offs to consider: some competitor modules offer multiple form-C relay outputs, larger contact ratings, or additional inputs. If an installation needs higher current switching or multiple independent outputs, a different module or external relay may be required. However, for the common combination of two supervised inputs and one monitored relay with SCI and EN54 certification, the EV-2I1O offers a balanced and cost-effective solution.
Customer feedback and installer impressions
Public, verifiable customer testimonials specific to the EV-2I1O are limited in open literature. However, installer feedback on Evolution-series modules generally emphasises the following themes:
- Reliable in-loop performance:Installers value the integrated SCI and the module’s behaviour during loop faults — preserving communication to unaffected devices reduces nuisance alarms and system downtime.
- Ease of installation:Compatibility with standard pattress boxes, clear LED indicators and straightforward addressing streamline on-site configuration and reduce labour time.
- Appropriate relay capacity:The 5 A relay rating is commonly cited as sufficient for many door-release and auxiliary control needs, making separate power relays unnecessary in many cases.
If you require formal endorsements or case-study references, ask your supplier for project references or to put you in touch with local installers who have deployed Evolution modules in similar applications.
Conclusion — why choose the Nittan EV-2I1O?
The Nittan Evolution EV-2I1O dual-input, single-output module is a pragmatic choice for designers and installers who need a compact, loop-powered, EN54-compliant interface device. Its combination of two supervised inputs, a monitored 5 A relay output, low quiescent current, and integrated negative-line short-circuit isolator addresses common needs in fire alarm and access-control systems without unnecessary complexity. The selectable failsafe mode, easy mounting in a standard UK 2-gang pattress and clear LED diagnostics further simplify installation and maintenance.
For projects that require a reliable, certified module to supervise peripheral devices and operate a door release or auxiliary output while preserving loop integrity in fault conditions, the EV-2I1O provides a cost-effective, field-friendly solution. Suggested retail price is approximately A394.64 (cost price A379.50) — while prices vary by supplier and region, the unit typically represents a good balance of capability and value within the addressable interface module class.
Before specifying the EV-2I1O, confirm specific site requirements such as switching loads, environmental conditions and local regulatory obligations, and ensure installation and commissioning are carried out by competent personnel per the manufacturer’s manual and relevant standards.
- EN54-17/18 certified, loop-powered interface with two supervised inputs and one monitored relay output.
- Built-in negative-line SCI maintains loop communication in a short-circuit condition.
- Low quiescent current and easy installation make it well-suited to both retrofit and new installations.
- Ideal where reliable supervised monitoring plus a mains-rated relay output are required in a compact, addressable device.
