CPE Device Management & GSD Files Flashcards

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

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

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

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

Answer: Status Byte 1

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

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

Answer: Byte 7

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

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

Answer: 58 bytes

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.

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

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

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.

Which PROFIBUS PA device parameter block contains the process value and its status for transmission to the DCS?

Answer: Function Block (AI/AO)

Function Blocks (such as Analog Input or Analog Output) hold the process value (PV) and its quality status that are exchanged cyclically with the host.