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UNO-3074 User Manual 22

2.6.2

Power On Configuration

Default configuration

after power on or

hardware reset is to set all the iso-

lated digital

output channels

to open status

(the current

of the load

can’t be

sink) so

that users need

not

worry

about damaging

external devices during

system

startup or reset. When

the

system is hot reset, then

the status

of iso-

lated digital

output channels are selected by

jumper JP7. Table 2.10

shows

the configuration of

jumper JP7.

2.6.3

Isolated

Outputs

Each of isolated

output channels

comes equipped with a

Darlington tran-

sistor. All output

channels share common emitters.

Please note

that if

an external

voltage (5

~ 40

VDC) is applied to

an iso-

lated output

channel while it is being used as an output

channel, the cur-

rent will flow from

the external voltage source

to the UNO-3074. Please

take care that the

current through each

DO pin

not exceed 200

mA. Figure

2.7 below shows how

to connect

external

output load

to the UNO-3074

isolated outputs.

Please

note that

DO2 and DO3

may be configured

output pins of

Counter 0 and Counter

1 (please refer to section

2.7 for

more details)

Note: Please refer to Figure A.3 for location of JP7

Table 2.10: Digital Output Power On Configuration

JP7

Power on configuration after hot reset

Reset all digital output

(default configuration)

Keep last status after hot reset

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 79 80

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Advantech UNO-3074 Manuel d'utilisateur Page 32

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