Mounting and cabling
EP1xxx
52
Version: 2.5.0
Electrical isolation
Digital modules
In the digital input/output modules, the grounds of the control voltage (GNDs) and the auxiliary voltage
(GNDp) are connected to each other!
Check this at the documentation of each used EtherCAT Box.
Analog modules
In the analog input/output modules the grounds of the control voltage (GNDs) and the auxiliary voltage
(GNDp) are separated from each other in order to ensure electrical isolation of the analog signals from the
control voltage.
In some of the analog modules the sensors or actuators are supplied by Up - this means, for instance, that in
the case of 0...10 V inputs, any reference voltage (0...30 V) may be connected to Up; this is then available to
the sensors (e.g. smoothed 10 V for measuring potentiometers).
Details of the power supply may be taken from the specific module descriptions.
Attention
Electrical isolation may be cancelled!
If digital and analog fieldbus boxes are connected directly via four-core power leads, the
analog signals in the fieldbus boxes may be no longer electrically isolated from the control
voltage!
3.3.2
Status LEDs for power supply
Fig. 48: Status LEDs for power supply
LED display
LED
Display
Meaning
Us (Control voltage)
off
The power supply voltage Us is not present
green illuminated
The power supply voltage Us is present
red illuminated
Because of overload (current > 0.5 A) the sensor supply
generated from power supply voltage Us was switched off for
all sensors fed from this.
Up (Auxiliary voltage)
off
The power supply voltage Up is not present
green illuminated
The power supply voltage Up is present
