User manual

Page 52
ELR 9000 Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
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 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, only mini-
mally impedant. See specications
table above.
3.5.4.6 Application examples
a) Switching off the DC input via the pin “REM-SB”
A digital output, e.g. from a PLC, may be unable to cleanly effect this as it may
not be of low enough resistance. Check the specication of the controlling ap-
plication. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC input of the device on and off. 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 input, 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 input on”. So when activating
remote control, the DC input would instantly switch on.
• Remote control is not active
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC input from being switched on by any
means. This results in following possible situations:
DC-
input
+
Pin
„REM-SB“
+
Parameter
„REM-SB“

Behaviour
is off
+
HIGH
+
normal

DC input not locked. It can be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted

DC input locked. It can not 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