Siemens S7-400 installation manual Diagnostic Buffer, Diagnostic Interrupt, DP Master, DP Slave

Glossary

Diagnostic Buffer

The diagnostic buffer is a retentive area of memory within the S7-400 CPU which stores the diagnostic events in the order they occurred.

Diagnostic Interrupt

Modules with diagnostics capability signal system errors to the S7-400 CPU by means of diagnostic interrupts.

DP Master

A master which is compliant with EN 50170, Part 3.

Interconnects the CPU and the distributed I/O system. Exchanges data via PROFIBUS DP with the distributed I/O and monitors the PROFIBUS DP.

DP Slave

A slave which is operated on PROFIBUS with PROFIBUS DP protocol and compliant with EN 50170, Part 3.

Prepares the data of encoders and actuators locally for their transfer to the CPU via PROFIBUS DP.

DPV1

Enhancement of distributed I/O to EN 50170. The results were incorporated into IEC 61158 / IEC 61784-1:2002 Ed1 CP 3/1. The term DPV1 is used in the SIMATIC documentation. The new version contains enhanced and simplified functionality, for example, the extension of acyclic services with new interrupt functions.

The DPV1 functionality is integrated into IEC 61158/EN 50170, Volume 2,

PROFIBUS.

E

Electromagnetic Compatibility (EMC)

Electromagnetic compatibility is understood to mean the capability of electrical apparatus to operate without faults in a given environment, without affecting that environment in an unacceptable manner.

Equipotential Bonding

An electrical connection (equipotential bonding conductor) that ties the exposed conductive parts of an item of electrical equipment and extraneous conductive parts to the same, or approximately the same, potential in order to prevent disturbing or dangerous voltages between these parts.

Glossary-4	Automation System S7-400	Hardware and Installation
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