Advantech PCI-1720 Manuale Utente Pagina 51

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Appendix B PCLD-881B Wiring Terminal Board 47
B.6 Differential Connections
a) Straight-through connection
(factory setting):
RAn = 0 (short)
RAn+1 = 0 (short)
RDn = none
CDn = none
b) 1.6 kHz (3dB) low pass filter
RAn = 5 k
RAn+1 = 5 k
RDn = none
CDn = 0.01µF
f3dB =
c) 10 : 1 voltage attenuator:
RAn = 4.5 k
RAn+1 = 4.5 k
RDn = 1 k
Cn = none
Attenuation =
d) 4 ~ 20 mA to 1 ~ 5 VDC signal
converter:
RAn = 0 (short)
RAn+1 = 0 (short)
RDn = 250 (0.1% precision
resistor)
CDn = none
AIn
AIn+1
Internal side Field side
AIn
AIn+1
Internal side Field side
RAn
RDn
RAn+1
AIn
AIn+1
Internal side Field side
RAn
CDn
RAn+1
1
2
π
(RAn +RAn
+1
) CDn
RDn
RAn + RAn
+1
+ RDn
where n = 0, 2, 4, ....., 30
AIn
AIn+1
Internal side Field side
RAn
RDn CDn
RAn+1
AIn
GND
Internal side Field side
RDn
AIn+1
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