Glossary
Distributed I/O system
308 System Manual, 09/2019, A5E03576849-AJ
Line
All the modules attached to a mounting rail.
Load current supply
Supply of modules like the interface module, power supply modules, I/O modules, and (if
applicable) sensors and actuators.
MAC address
Device identification unique worldwide, which is already assigned to each PROFINET device
in the factory. Its 6 bytes are divided into 3 bytes for the manufacturer ID and 3 bytes for the
device ID (serial number). The MAC address is usually legible on the device.
Main switch
Every industrial machine that falls under the scope of DIN EN 60204 Part 1 (VDE 0113,
Part 1) must be equipped with a main switch that disconnects all electrical equipment from
the network while cleaning, maintenance, and repair work is being carried out, as well as
during long periods of downtime. Usually a switch which can be operated by hand that is
stipulated for electrical or mechanical prevention of a hazard. The main switch can also
function as an EMERGENCY-OFF device.
The main switch must meet the following requirements:
● Externally accessible mechanical rotary lock.
● Only one OFF position and one ON position with allocated stops.
● Two positions labeled "0" and "I". 4th lockable OFF position.
● Cover for the power supply terminals to protect against accidental contact.
● The switching capacity must correspond to AC-23 for motor switches and AC-22 for load-
break switches (utilization category).
● Switch position displayed automatically.
Module fault
Module faults can be external faults (e.g. missing load voltage) or internal faults (e.g.
processor failure). Internal faults always require module replacement.
Monitoring time
→ PROFIsafe monitoring time
Motor starter
Motor starter is the generic term for direct-on-line and reversing starters.
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