Application Examples - Elektro-Automatik EL 9080-170 B Betriebsanleitung

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.
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 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 specification of the controlling ap-
plication. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC terminal 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
terminal from being switched on in manual or digital remote control and on the other hand the pin can
switch the DC 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 input, 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 input on". So when activating
remote control, the DC input would instantly switch on.
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B 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 low
V~2
impedance. See specifications table
above.
AGND
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ea1974@elektroautomatik.de
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