| Interface | 
neutral FieldBusPlug interface | 
| Supply of the module’s electronic circuitry | 
from the FieldBusPlug | 
| Supply of the electronic circuitry of the I/O expansion     modules attached | 
through the expansion bus interface (I/O-Bus) | 
| Address switches | 
for setting the field bus address (0 to 99) | 
| Digital inputs | 
8 (24 V DC) | 
| Digital inputs/outputs | 
8 (24 V DC) | 
| LED displays | 
for system displays, signal statuses, errors and power     supply | 
| External supply voltage | 
via the terminals ZP and UP (process voltage 24 V DC) |