Application Examples - Elektro-Automatik PS 9000 1U Betriebsanleitung

3.5.4.6 Simplified diagram of the pins
Digital Input (DI)
+
The internal circuit requires that a switch
with low resistance should be used (relay,
switch, circuit breaker etc.) in order to
send a clean signal to the DGND.
A digital output from a circuit or PLC may
not be sufficient if not an "open collector".
Digital Output (DO)
+10V
12V
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.
3.5.4.7

Application examples

a) Switching off the DC output via the 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-
fication 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. From KE firmware version 2.03, this is also available without remote control
being active.
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 definitions 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.
• Remote control is not active
In this mode of operation pin "REM-SB" can serve as lock, preventing the DC output from being switched on by
any means. This results in following possible situations:
DC- Pin
+
output „REM-SB"
HIGH
+
LOW
is off
HIGH
+
LOW
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Parameter
+
 Behaviour
„REM-SB"
+
DC output not locked. It can be switched on by pushbutton "On/Off"
normal
(front panel) or via command from digital interface.

+
inverted
DC output locked. It can not be switched on by pushbutton "On/Off"
+
inverted
(front panel) or via command from digital interface. When trying to

switch on, a popup in the display resp. an error message will be
+
normal
generated.
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
PS 9000 1U Series
Analog Input (AI)
High resistance input (impedance
V~0.5
>40 k....100 kΩ) for an OA circuit.
AGND
Analog Output (AO)
Output from an OA circuit, only mini-
V~2
mally impedant. See specifications
table above.
AGND
www.elektroautomatik.de
ea1974@elektroautomatik.de
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