DF53/DF98 Power Supply Impedance for Fieldbus networks


Device specially designed for panel installation;
designed to provide appropriate impedance for fieldbus networks.
DF53 (4 ports)
DF53-FC (4 ports)
DF98 (2 ports)

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These modules were specially designed to provide appropriate impedance for fieldbus networks.

  • DF53 (4 ports)
  • DF53-FC (4 ports)
  • DF98 (2 ports) 

The purpose of this impedance is to implement an output circuit where the impedance is greater than 3 KΩ, and when assembling in parallel with two 100 Ω ±2% terminators, it results in 50 Ω line impedance approximately. This impedance can be implemented in a passive mode (50 Ω resistance in series with a 100 mH inductance) or in an active mode, through an impedance control circuit.

The fieldbus power supply impedance is a non-isolated, active impedance control device, in compliance with IEC 61158-2 standard. This device provides output impedance which, in parallel with the two bus terminators (a 100 Ω resistor in series with a 1 mF capacitor) required by the standard, results in a pure resistive line impedance for a broad frequency range. DF53 and DF98 were designed to work in non-hazardous areas.

Industrial Technical Services from Mississauga, Ontario is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels.

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