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Saia-Burgess Controls AG

Manual I/O-modules for PCD1 │ PCD2 series │ Document 27-600 – Release ENG09 │ 2019-05-01

5-100

I/O modules PCD1|PCD2

PCD2.W525 Combined analogue input/output module with galvanic isolation

Function

Power Supply

PCD2.W525 has to be supplied externally! This power supply is galvanically iso-

lated to both, the Saia PCD

and the I/Os of W525. Furthermore, the design allows

using the same power supply for the Saia PCD

and for W525 without loosing the

galvanicisolation.Theseschematicsshowthedi󰀨erentzonesofisolation:

Timing

● Inputs

○ Internally,W525nishesacquiringevery2msanewvalueforevery

input channel

○ This value is always ready to be read by the Saia PCD

○ Dependent on the Saia PCD

speed, the transmission time of a single

  16-Bitscaledvalue(ofasingleinputchannel)takestypically100μs(on

  aPCD2.M480)or600μs(onaPCD2.M170)

● Outputs

○ Internally, W525 outputs the last received output value from Saia PCD

with a maximum delay of 2 ms.

○ Dependent on the Saia PCD

speed, the transmission time of a single

  16-Bitscaledoutputvaluetakestypically100μs(onaPCD2.M480)or

  600μs(onaPCD2.M170).

Filter

● Inputs

 Therearetwofactors,whichhavelteringe󰀨ectstotheacquiredvalues:

○ Thebasehardwarelterwithatimeconstantof2ms.Thislterattenu-

  atestheinputsignalby6dB/decadeatacut-o󰀨frequencyof80Hz.

○ Thesecondinuenceiscausedbysoftwareandresultsinadelayof

  theacquiredvaluefor2mswithanotchltercharacteristicsat500Hzif

  nosoftwarebased50Hz/60Hzlterisselected.

SBC PCD2 Series User Manual

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