Siemens SIMATIC ET 200S Manual page 581

Glossary
Aggregate current
The sum of the currents of all the output channels of a digital output module.
AUX1 bus
Power modules permit you to connect additional potentials (up to 230 VAC), which
you can apply by means of the AUX(iliary) bus. You can set the AUX(iliary) bus
individually as:
• A protective ground bar
• Additionally required voltage
Backplane bus
The backplane bus is a serial data bus via which the IM151-1 interface
communicates with the electronic modules/motor starters, supplying them with the
required voltage. The connection between the individual modules is established by
means of the terminal modules.
Bus
A common transfer route connecting all notes and having two defined ends.
In the case of the ET 200, the bus is a two-wire or fiber-optic cable.
Bus connector
A physical connection between the bus nodes and the bus line.
Chassis ground
Chassis ground refers to all the interconnected inactive parts of a piece of
equipment that, even in the event of a fault, cannot carry voltage that is dangerous
to the touch.
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Glossary-1