Fieldbus Solutions - STAHL - #8

8

The R. STAHL digital I/O coupler Ex e/Ex i connects solenoid valves, LED indicating lamps, contacts and proximity switsches to the non-intrinsically safe trunk. Alternatively, the digital I/O coupler Ex e/Ex i can be used on an intrinsically safe trunk. The coupler features eight fully fledged, non-multiplexed Ex i NAMUR inputs and four digital outputs. All inputs and outputs feature open-circuit monitoring and short-circuit monitoring and are electrically isolated from the trunk. Two versions are available: in the case of the 2-wire coupler, power is supplied by the trunk. However, this is possible only on the non-intrinsically safe trunk. The 4-wire coupler is powered from an external 24V power supply. In this case, it makes no difference whether the trunk is operated in intrinsically safe or non-intrinsically safe manner.

Technical Details

> for Foundation fieldbus H1

> 8 NAMUR inputs, intrinsically safe

> 2 inputs, configurable as frequency/counter input

> 4 outputs, intrinsically safe for solenoid valves and LEDs

> 30/15mA

> 13V @ 30mA

> open-circuit and short-circuit monitoring

> electrical isolation between inputs, outputs and trunk

> trunk Ex e or Ex i

> power supply provided by

trunk 17...32V or external 24V DC

> LED indicators for all inputs and outputs (optional)

FF Function Blocks

> DI, DO

> MDI, MDO (multiple DI, DO)

> AI for frequency input

> CI for counter input

> timer for logic functions