User manual

Page 35
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 5000 A Series
3.5.4.5 Simplied diagram of the pins
+
Digital Input (DI)
The internal circuit requires that a switch
with low resistance should be used (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 low-
impedance.Seespecicationstable
above.
3.5.4.6 Application examples
a) Switching off 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beusedtoswitchtheDCoutputofthedeviceonandoff.FromKE
rmwareversion2.03,thisisalsoavailablewithoutremotecontrolbeingactive.Inordertousethis
feature,itmightberequiredtoupdatetheinstalledrmware.Tondoutwhichversioniscurrently
installed, you need to read the information via any of the digital interface, whereas the easiest way
can be to connect the device via LAN and open the device’s website.
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, which
can be set by a command via digital interface. The setting is permanently stored. For details refer to the external
guide “Programming ModBus & SCPI”.
If the pin is unconnected or the connected contact is open, the pin will be HIGH. With parameter
“Analog interface: REM-SB level” 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 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