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mPower 300 Series (Rev G)
5.5.4.5 Overview of the Sub-D Socket
Simplified 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 sufficient if not an “open collector”.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance >40
k–.100 kΩ) for an OA circuit.
4K
7
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 min-
imally impedant. See specifications
table above.
5.5.4.6 Analog interface 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 be used to switch the DC output of the unit 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 terminal on or off, but not standalone.
See below at “Remote control has not been activated”.
