5 Electrical connections
5.7.5 Analog I/O, DSQC 355 (optional)
124 A 3HAC 16245-1
The input current is 5.5 mA (at 24V) on the digital inputs. A capacitor connected to ground,
to prevent disturbances, causes a short rush of current when setting the input.
Connect a resistor (100 W) in series when connecting outputs, sensitive to pre-oscillation
current.
Bus status LEDs The figure and table below show the location and significance of the the LEDs on the board.
GND 32
Signal name X7 pin Explanation
Designation Color Description
NS/MS Green/red See section 4.1.
RS232 Rx Green Indicates the state of the RS232 Rx line.
LED is active when receiving data. If there is no light,
check communication line and connections.
RS232 Tx Green Indicates the state of the RS232 Tx line. LED is active
when transceiving data.
If there is no light when transmission is expected, check
error messages and check also system boards in rack.
+5VDC / +12VDC /
-12VDC Green Indicates that supply voltage is present and at correct
level.
If there is no light, check that voltage is present on
power unit and that power is present in power connec-
tor. If not, check cables and connectors.
If power is applied to the unit but it does not work,
replace the unit.
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