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Concept
Products:
AO-8, AO-V-8, AS-P-3, DI-16, DO-FA-12, DO-FC-8, AS-P, PS-24V, RTD-DI-16, UI-16, UI-16 v2, UI-8/AO-4, UI-8/AO-4 v2, UI-8/AO-V-4, UI-8/AO-V-4 v2, UI-8/DO-FC-4, UI-8/DO-FC-4 v2
Functionalities:
Central IO , Hardware
Product version:
7.0, 7.1
6/25/2026
I/O Bus Restrictions
The I/O bus imposes restrictions on the number of devices that can be connected to the bus and what type of devices that are allowed on certain positions.
The following restrictions apply to the I/O bus:
Position 1 reserved for a power supply
Position 2 reserved for an automation server
Maximum one automation server per I/O bus
Maximum 32 devices (positions) per I/O bus
Note:
Position 1 is not used when the automation server in position 2 is an AS-P-3 server as this type has a built-in power supply.
Note:
Even when connected by an S-cable, no more than 32 devices are allowed on the I/O bus.
Terminal Bases
PS-24V Power Supplies
AS-P Servers
AS-P-3 Servers
I/O Bus
I/O Bus Elements
Power Budget
Power Budget for AS-P-3 Servers
Configuring an I/O Module