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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSI 9000 15U/24U Series
3.5.4.5
Overview of the Sub-D Socket
3.5.4.6
Simplified 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 k....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, low im
-
pedance. See specifications 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 specification 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. This
function is also available without remote control being active and can on the one hand block the
DC output from being switched on in manual or digital remote control and on the other hand the
pin can switch the DC output on or off, but not standalone. See below at “Remote control has not
been activated”.
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 level definitions in
. The logical function and the default levels can be inverted by a parameter in the
setup menu of the device. See
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”. It means, when
activating remote control, the DC output will instantly switch on.
