ABB AC500 V3 Hardware Manual page 912

System assembly, construction and connection
Overall information (valid for complete AC500 product family) > Serial I/O bus
1 I/O bus connection
The connection of the I/O bus is performed automatically by telescoping the modules on the DIN
rail. The I/O bus provides the following signals:
● Supply voltage of 3.3 V DC for feeding the electronic interface components
● 3 data lines for the synchronized serial data exchange
● several control signals
With its fast data transmission, the I/O bus obtains very low reaction times. Depending on the
device and on the version of firmware and Automation Builder, the following numbers of I/O
devices can be connected to the I/O bus.
912
NOTICE!
The I/O bus is not designed for plugging and unplugging modules while in
operation. If a module is plugged or replaced while the bus is in operation, the
following consequences are possible
– reset of the station or of the CPU
– system lockup
– damage of the module
WARNING!
Removal/Insertion under power
The devices are not designed for removal or insertion under power. Because of
unforeseeable consequences, it is not allowed to plug or unplug devices with
the power being ON.
Make sure that all voltage sources (supply and process voltage) are switched
off before you
– connect or disconnect any signal or terminal block
– remove, mount or replace a module.
Disconnecting any powered devices while energized in a hazardous location
could result in an electric arc, which could create a flammable ignition resulting
in fire or explosion.
Make sure that power is removed and that the area has been thoroughly
checked to ensure that flammable materials are not present prior to proceeding.
The devices must not be opened when in operation. The same applies to the
network interfaces.
3ADR010278, 3, en_US 2022/01/31