Elektro-Automatik PSI 9000 DT Series, Руководство по эксплуатации

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Page 55
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de
PSI 9000 DT Series
3.5.4.5 Overview of the D-Sub15 socket
3.5.4.6 Simplified diagram of the pins
++
Digital Input (DI)
The DI is internally pulled up and thus it
requires to use a contact with low resist-
ance (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
Ω
...100 kΩ) for an operational
amplifier circuit.
4K
7
12V
+10V
Digital Output (DO)
A quasi open collector, realised 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 amplifier
circuit, with low impedance. See
specifications table above.
3.5.4.7 Application examples
a) Switching the DC output with pin REM-SB
A digital output, e. g. from a PLC, may be unable to correctly pull down the pin as
it may not have a low output impedance. Check the specification of the controlling
application to find out if the output is compatible. Also see the pin diagrams above.
In remote control, pin REM-SB is used to switch the DC output of the device on and off. The function
of the pin is also available without remote control being active. See below.
It’s recommended that a low resistance contact such as a switch, relay or transistor is used to pull
the pin to ground (DGND).
Following situations can occur:
• Analog 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 with pin REMOTE, the DC output will instantly switch on.