CPE CPE Device Management & GSD Files 2

Question 1

In PROFIBUS DP, what is the function of the 'Ident_Number' field in a GSD file?

Accepted Answer

It is a vendor-assigned unique identifier used by the master to verify a correct slave type is present

Answer

The Ident_Number is a two-byte vendor-specific code registered with PROFIBUS International, used by the master to confirm device identity during configuration.

Question 2

Which PROFIBUS DP diagnostic byte contains the 'Station Not Ready' bit that indicates a slave is not yet ready for data exchange?

Accepted Answer

Status Byte 1

Answer

Status Byte 1 of the standard 6-byte diagnostic response contains bits including Station Non Existent, Station Not Ready, and Configuration Fault.

Question 3

A PROFIBUS slave device sends extended diagnostic data. Where in the diagnostic telegram does device-specific extended diagnostic data begin?

Accepted Answer

Byte 7

Answer

The first 6 bytes of a PROFIBUS DP diagnostic telegram are standardized header bytes; device-specific extended diagnostic data starts at byte 7.

Question 4

What is the maximum length of the extended diagnostic data block in a PROFIBUS DP slave response?

Accepted Answer

58 bytes

Answer

The total diagnostic response including the 6 standard bytes must not exceed 244 bytes, leaving a maximum of 238 bytes for extended diagnostics, but the standard caps the extended block at 58 bytes for DP-V0.

Question 5

In a PROFIBUS PA device, what does the Physical Device Tag (PD_TAG) represent?

Accepted Answer

A user-assigned alphanumeric name stored in the device that identifies it in the plant

Answer

The PD_TAG is a configurable 32-character string stored in the device used to identify it by plant tag name, independent of its network address.

(CPE) Certified Profibus Engineer Practice Test

(CPE) Certified Profibus Engineer Practice Test

CPE CPE Device Management & GSD Files 2