Page 59
Intepro Systems
www.inteproate.com
PS 9000 3U Series
3.5.4.5
Overview of the Sub-D Socket
3.5.4.6
Simplified 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
amplifier circuit.
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 amplifier
circuit, low impedance. See specifi
-
cations table above.
3.5.4.7
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 specification 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 off. 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 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 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, the DC output will instantly switch on.
Summary of Contents for 06230250
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