The dimensions are in mm and in brackets in inch.
32.5 Connection
1 I/O bus
2 Slot for processor module
3 Slots for communication modules
4 Interface for FieldBusPlug, not for terminal base TB523-2ETH
5 Power supply 24 VDC
6 Serial interface COM1
7 Network interfaces: TB5xx-ETH: Ethernet, TB5xx-ARCNET: ARCNET
8 TB5x1: Serial interface COM2, TB523-2ETH: second Ethernet network interface
9 Holes for wall mounting
2019/11/153ADR024117M02xx, 11, en_US244