ABB ACH550-01 User Manual page 402

The terminals on the control board as well as on the optional
modules attachable to the board fulfil the Protective Extra Low
Voltage (PELV) requirements stated in EN 50178, provided that
the external circuits connected to the terminals also fulfil the
requirements and the installation site is below 2000 m (6562 ft).
Note: For safety reasons the fault relay signals a "fault" when
the ACH550 is powered down.
You can wire the digital input terminals in either a PNP or NPN
configuration.
PNP connection (source)
X1
390
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
ACH550 User's Manual
NPN connection (sink)
X1
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
Technical data