Advantech PCI-1734 Manual de usuario descargar pdf (Pagina 3)

Startup Manual 3

Some users will want the capability of clearing each

digital output when the system (or PC) issues a reset

signal on the PCI bus. Some users will want to clear

their digital outputs only as part of system power-on.

The PCI-1734 satisfies both these needs by providing

jumper JP2. Depending on the application, this capabil-

ity may allow digital outputs to be “OFF” without

requiring a complete shutdown of processes controlled

by the card.

Complete loss of power to the chip clears the chip

memory. Thus, no matter how JP2 is set, if the power to

the PCI-1734 is disconnected, the digital output chan-

nel’s initial power-on state will be “OFF”.

Each of the 32 isolated digital output channels comes

equipped with a darlington transistor. Every eight out-

put channels share common emitters and integral sup-

pression diodes for inductive load, activated by

connecting PCOM to VDD. (Channels 0 ~ 7 use

PCOM0. Channels 8 ~ 15 use PCOM1. Channels 16 ~

23 use PCOM2. If the external voltage source (5~40 V)

is connected to each isolated output channel (IDO) and

its isolated digital output turns on (200 mA max./ch),

the card's current will sink from the external voltage

source. The current through EGND should not exceed

4.8 A. If the current for all channels combined exceeds

2 A, CN2 must be connected to the external ground to

share the extra current. The following figure shows how

to connect an external output load to the card's isolated

outputs.

Setting the time to reset digital outputs

Isolated Digital Output Connections

1 2 3

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Advantech PCI-1734 Manual de usuario Pagina 3