FRI302 Fieldbus Relay and Dry Contact Input

FRI302 is a Foundation™ fieldbus device with two built-in relays and two dry contact inputs. It makes the integration of fieldbus and conventional devices such as solenoids, on/off valves, electrical actuators, motors, pumps and soft starters, easier. FRI302 fieldbus can be field installed close to the conventional input/output devices without the need to run long conventional wiring to the control room. The FRI302 is an integral part of SYSTEM302 and can also be integrated with any control systems supporting FOUNDATION™ Fieldbus technology.

An extensive function block library enables FRI302 to perform logic and regulatory control functions at the field level, compounding larger control strategies with other H1 fieldbus devices and the host control system. Instantiable function blocks provide great flexibility to the control strategies. Link master capability allows FRI302 to work as backup LAS for greater availability to the H1 network communications.

A very interesting application is the FRI302 to be used as interface of electrical actuators. Any electrical actuator, including Smar AD/AR/AL series becomes a fieldbus actuator, making FRI302 the perfect solution for the revamp of industrial plants. The PID Step function block is ideal in these cases once it can modulate the valve without the actual position feedback.

Some Characteristics


Digital only. Fieldbus, 31.25 Kbits/s voltage mode


Quiescent current 17.5 mA from Fieldbus network

Turn-on Time

Approximately 10 seconds.

Update Time

Approximately 0.5 second.

Humidity Limits

0 to 100% RH.

Function Blocks

Up to 20 Dynamically Instantiable Function Blocks.
Click here for the list of available Function Blocks
The Function Blocks available allow simple and complex control strategies to be placed inside the field device, making the field device an integral part of the control system. In order to fully benefit from the Function Blocks in the device a True Foundation Fieldbus system is recommended.
For more information about SYSTEM302, click here.


Using local adjustment magnetic tool if device is fitted with LCD display. Complete configuration possible using PC software interface.


Optional 4½ digit LCD indicator.

Temperature Limits

Operation:        -40 to 85ºC (-40 to 185 ºF)
Storage:           -40 to 120ºC (-40 to 250 ºF)
Display:            -10 to 60ºC (14 to 140ºF) operation
                         -40 to 85ºC (-40 to 185 ºF) without damage.

Vibration Effect

Meets SAMA PMC 31.1 specification.

Electro-Magnetic Interference Effect

Designed to comply with IEC 801.


Physical: according to IEC 61158-2 and conformity with the FISCO model.

Electrical Connection

1/2-14 NPT, PG 13.5 or M20 x 1.5.

Material of Construction

Injected low copper aluminum with polyester painting or 316 Stainless Steel housing, with Buna N O-rings on cover (NEMA 4X).


With an optional bracket that can be installed on a 2" pipe or fixed on a wall or panel.


Without display and mounting bracket: 0.80 kg.
Add for digital display: 0.13 kg.
Add for mounting bracket: 0.60 kg.


2 dry contact inputs electrically isolated from each other.


02 built-in relays:

  • 02 Normally-closed (NC).
  • 02 N.O Normally-open (NO)
  • 01 N.C. and 01 N.O.


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