User manual

Page 57
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSI 9000 DT Series
3.5.4.5 Overview of the Sub-D Socket
3.5.4.6 Simplied diagram of the pins
+
Digital Input (DI)
It requires to use a switch with low resist-
ance (relay, switch, circuit breaker etc.) in
order to send a clean signal to the DGND.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance
>40 kΩ....100kΩ)foranOAcircuit.
4.7k
12V
+10V
Digital Output (DO)
A quasi open collector, realised as high
resistance pull-up against the internal sup-
ply. In condition LOW it can carry no load,
merely switch, as shown in the diagram
with a relay as example.
V~2
AGND
Analog Output (AO)
Output from an OA circuit, only mini-
mallyimpedant.Seespecications
table above.
3.5.4.7 Application examples
a) Switching the DC output with pin “REM-SB”
A digital output, e.g. from a PLC, may be unable to cleanly pull down the pin as
it may not be of low enough resistance. Check the specication of the controlling
application. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC output of the device on and off. The
function of the pin is also available without remote control being active. See below.
It is recommended that a low resistance contact such as a switch, relay or transistor is used to switch
the pin to ground (DGND).
Following situations can occur:
• Remote control has been activated
During remote control via analog interface, only pin “REM-SB” determines the states of the DC output, according
tothelevelsdenitionsin3.5.4.4. The logical function and the default levels can be inverted by a parameter in the
setup menu of the device. See 3.4.3.1.
If the pin is unconnected or the connected contact is open, the pin will be HIGH. With parameter
“Analog interface REM-SB” being set to “normal”, it requests “DC output on”. So when activating
remote control, the DC output will instantly switch on.