Axon Cerebrum CGP-4848, Руководство по эксплуатации

Страница: 8 / 17

8
5
Installation
Connecting the
D-sub connectors
The connection details of the 37 way D type connectors are shown
in the tables on the next page. Please make sure the cables are
properly soldered by trained personnel.
General Purpose
Inputs
To activate a GPI input on the unit a voltage drop (4.5V-13Vdc) has
to be present across the input (A & B) pins. Internally these pins
feed a bidirectional optical isolator which provides an electrical
isolation between the input signals applied and the unit. Internal
resistors on each pin (330 Ohms, total of 660 Ohms) will limit the
current flow through the optical isolator.
If the input to the unit cannot generate a voltage then the local
supply voltage (+5Vdc) on pin 19 of each of the input connectors
can be used to provide this. This output pin is current limited and
will provide no more than 400mA. However even if all 16 inputs
use this pin then only 120mA will be drawn.
For instance to connect a normally open mechanical switch to
trigger input GPI 1 when it is closed, wire pin 19 of the input
connector to one side of the switch, then wire the other side of the
switch to pin 1 (Input 1A) of the same connector, then wire pin 20
(Input 1B) to pin 17,18,36 or 37(0V).
General Purpose
Outputs
The GPI outputs are connected internally to relay contacts. On the
first five GPI outputs of each connector the common, normally open
and normally closed contacts are available. On the remaining eleven
GPI outputs just the common and normally open contact pairs are
available.
The contact pairs can pass a current of up to 2A with a resistive
load. For more details see the following specification section.