System components: Pulse digital input module SFC441

The following pulse input modules are available: SFC441 (2 Groups of 8 inputs of 24 VDC for low speed pulse counting - sink) SFC442 (2 Groups of 8 inputs of 24 VDC for high speed pulse counting - sink) SFC467 (2 Groups of 8 inputs of 24 VAC for high speed pulse counting - sink) The modules have 2 groups of 8 inputs to count and accumulate pulses until the Field Controller reads them. Immediately after it is read, every individual counter is cleared and the hardware begins to count again, ensuring that no pulses are lost during the acquisition process. An associated PULSE Function Block has been specifically designed to take advantage of this module. For details see the Function Block manual. SFC441 can be driven by a mechanical contact of a relay or reed-switch. A single pole internal filter has the cutting frequency in approximately 200 Hz SFC442 is for higher frequency sources that do not generate bouncing on level switching. SFC467 is for higher frequency AC sources

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