Instructions

Page 59
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 9000 3U Series
3.5.4.5 Overview of the Sub-D Socket
3.5.4.6 Simplied diagram of the pins
++
Digital Input (DI)
The DI is internally pulled up and thus it re-
quires to use a contact with low resistance
(relay, switch, contactor etc.) in order to
clearly pull the signal down to DGND.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance
>40 k....100 kΩ) for an operational
amplier circuit.
4K7
12 V
+10V
Digital Output (DO)
A quasi open collector, realized as high
resistance pull-up against the internal
supply. The design doesn’t allow the pin
to be loaded, but to switch signals by
sinking current.
V~2
AGND
Analog Output (AO)
Output from an operational amplier
circuit, low impedance. See speci-
cations table above.
3.5.4.7 Application examples
a) Switching o󰀨 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cation of the controlling
application. Also see pin diagrams above.
In remote control, pin REM-SB is used to switch the DC output of the device on and o󰀨. This func-
tion is also available without remote control being active and can on 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 o󰀨, 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 levels denitions 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.