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 2U Series
3.5.4.5 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.
A digital output from a circuit or PLC may
not be sufcient if not an “open collector”.
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.
3.5.4.6 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. From KE
rmware version 2.07, 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 denitions in 3.5.4.3. 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-
output
+
Pin
„REM-SB“
+
Parameter
„Rem-SB“

Behaviour
is off
+
HIGH
+
normal

DC output not locked. It can be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted

DC output locked. It can’t be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface. When trying to
switch on, a popup in the display resp. an error message will be
generated.
LOW
+
normal