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Text version of the page
| ISbus fieldbus | ||||||||||||
| fifilrl rifivicfi nnnplRr ex r/rx r | ||||||||||||
| 7 | ||||||||||||
| The R. STAHL field device coupler Ex e/Ex e connects non-intrinsically safe field devices to the trunk which is also not intrinsically safe. Four or eight field devices can each be powered with 40 mA, so there is still adequate reserve for a hand-held tester. Here as well, each spur features 50 mA current limiting in order to prevent feedback effects on the trunk and, thus, on the entire system in the event of short-circuits. Installation, wiring, housings, terminals and shield earthing etc. are designed as on the field device coupler Ex e/Ex i. Power management with the R. STAHL field device coupler: as soon as the voltage on the trunk exceeds 16 V, the spurs are activated one after the other. In the event of a short-circuit, the spur in question is deactivated until the short-circuit is eliminated. If several spurs are affected by the short circuit, the trunk is loaded only with maximum one short-circuit current. This minimises the current consumption of the trunk and the power loss of the coupler under all operating conditions. | ||||||||||||
| Technical Details > for non-intrinsically safe Foundation Fieldbus H1 or Profibus PA field devices > 4 or 8 channels > 40mA per spur, current limiting < 50mA > power management > connection using screw terminals or cage clamp terminals > capacitive or direct earthing for cable shields > fitted terminating resistor | ||||||||||||