ABB IRB 6600 - 175/2.55 User Manual page 326

5 Electrical connections
5.7.5 Analog I/O, DSQC 355 (optional)
Signal name
GND
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.
Designation
NS/MS
RS232 Rx
RS232 Tx
+5VDC / +12VDC /
-12VDC
124
X7 pin Explanation
32
Color Description
Green/red See section 4.1.
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.
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.
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.
A 3HAC 16245-1