Advantech PCI-1718 Series Manuel d'utilisateur télécharger pdf (Page 40)

PCI-1718 Series User Manual 32

Expanding Analog Inputs

You can expand any or all of the PCI-1718HDU/HGU's A/D input chan-

nels using multiplexing daughterboards. Daughterboards without D-type

connectors require the PCLD-774 Analog Expansion Board.

The PCLD-789(D) Amplifier and Multiplexer multiplexes 16 differential

inputs to one A/D input channel. You can cascade up to eight PCLD-

789(D)s to the PCI-1718HDU/HGU for a total of 128 channels. See the

PCLD-789(D) user's manual for complete operating instructions.

The PCLD-774 Analog Expansion Board accommodates multiple exter-

nal signal-conditioning daughter boards, such as PCLD-779 and PCLD-

789(D). It features five sets of on-board 20-pin header connectors. A spe-

cial star-type architecture lets you cascade multiple signal-conditioning

boards without the signal-attenuation and current-loading problems of

normal cascading.

The PCLD-8115 Screw Terminal Board makes wiring connections easy.

It provides 20-pin flat cable and DB-37 cable connectors. It also includes

CJC (Cold Junction Compensation) circuits.

Special circuit pads on the PCLD-8115 accommodate passive signal con-

ditioning components. You can easily implement a low-pass filter, atten-

uator or current shunt by adding resistors and capacitors.

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Advantech PCI-1718 Series Manuel d'utilisateur Page 40