ABB AX521 User Manual

1.4 Connection
1 I/O bus
2 Allocation between terminal number and signal name
3 8 yellow LEDs to display the signal states C0 - C7
4 1 green LED to display the state of the process supply voltage UP
5 1 red LED to display errors
6 Label
7 Terminal unit TU515/TU516
All I/O channels (digital and analog) are protected against reverse polarity,
reverse supply and continuous overvoltage up to 30 VDC.
AC522
Connection
2019/11/153ADR024117M02xx, 11, en_US12

ABB AX521 Specifications

General

Brand	ABB
Model	AX521
Category	I/O Systems
Language	English