Profibus Network Architecture & Design Flashcards
7 cards from real CPE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Profibus Network Architecture & Design flashcards as text
What is the maximum total number of stations supported across an entire Profibus DP network (using repeaters)?
Answer: 126
Profibus DP supports a maximum of 126 stations across the entire network (addresses 0–125), regardless of the number of segments or repeaters used.
In a Profibus network with multiple masters, how is bus access arbitrated between Class 1 masters?
Answer: Token passing in ascending address order
Multiple Profibus masters share the bus using a logical token ring where the token is passed in ascending station address order, granting each master a turn to communicate.
Which Profibus DP feature allows a slave to notify the master of an alarm or event without waiting to be polled?
Answer: DP-V1 alarm acknowledgment mechanism
DP-V1 introduced an alarm mechanism where slaves can signal alarms to the master, and the master must explicitly acknowledge receipt of each alarm.
When installing Profibus RS-485 cable near high-voltage power cables, what minimum separation distance is generally recommended?
Answer: 20 cm
A minimum separation of 20 cm (200 mm) between Profibus cables and high-voltage power cables is generally recommended to reduce electromagnetic interference.
What is the purpose of the 'Ident_Number' field in a Profibus GSD file?
Answer: Uniquely identifies the slave device type to the master
The Ident_Number is a unique 2-byte identifier assigned by the Profibus organization that identifies the specific device type, allowing masters to verify correct device configuration.
In Profibus DP-V2, the 'publisher/subscriber' model enables which advanced communication capability?
Answer: Slaves communicating directly with other slaves (cross-communication)
DP-V2 publisher/subscriber (also called slave-to-slave communication or Data Exchange Broadcast) allows slave devices to directly exchange data with other slaves without master intervention.
Which optical fiber interface standard is commonly used to extend Profibus DP networks in environments with severe electromagnetic interference?
Answer: OLM (Optical Link Module) with BFOC/2.5 connectors
Profibus OLMs (Optical Link Modules) using BFOC/2.5 (ST-style) connectors are the standard solution for fiber optic extension of Profibus DP networks in high-EMI environments.