System Overview
74
AVENTICS
| INTERBUS | R412005655–BDL–001–AB
US1 and US2, low voltage
monitoring at 18.5 V
The US1 supply voltage (for inputs and logics) is monitored at
18.5 V. If the voltage falls below this value, an error signal is
generated and is reported via LEDs and diagnostic information.
The US2 supply voltage (for valves and outputs) is monitored at
18.5 V. 18 V is the safe turn-on voltage for the valves. If the value
falls below 18.5 V, an error signal is generated and is reported
via LEDs and diagnostic information.
US2, low voltage
monitoring at 12 V
(emergency off)
The US2 supply voltage (valves and outputs) is monitored at
18.5 V and 12 V. If the value falls below 12 V, an emergency
signal off is generated and is reported via LEDs and diagnostic
information.
3.2.2
PM12A power module
POWER X10 plug
P24VN power supply for outputs whose output modules are
connected directly to the power module.
CAUTION
There is an internal connection between the PGND pin on the
POWER X10 and the GND connection on the bus coupler if a
power module is present. That means: if a power supply unit
without safe isolation is used and the power supply is only
connected to one of the two plugs, voltage can form on the
PGND pin which is dangerous when touched!
O
The 24 V power supply must stem from a power supply
unit pack which is electrically isolated according to
DIN EN 60742, classification VDE 0551.