Siemens SIMATIC S7-400 Hardware And Installation Manual page 278

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 Modules with diagnostics capability signal system errors to the S7-400
Interrupt CPU by means of diagnostic interrupts.
E
Electromagnetic Electromagnetic compatibility is understood to mean the capability of
Compatibility electrical apparatus to operate without faults in a given environment,
(EMC) without affecting that environment in an unacceptable manner.
Equipotential An electrical connection (equipotential bonding conductor) that ties the
Bonding 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.
Error Display Error display is one of the possible responses of the operating system
to a run-time error. The other possible responses include: error
response in the user program, STOP mode of the CPU.
Error Handling When the operating system detects an error (for example, STEP 7
via OB access error), it calls the specific organization block (error OB) for this
error, where the further response of the CPU can be specified.
Error Response Response to a run-time error. The operating system can respond to the
following types: transferring of the programmable controller to STOP
mode, calling of an organization block where the user can program a
response, or displaying of the error.
Expansion Module The expansion module of M7-400 is connected with the CPU via an
ISA bus interface and accommodates up to three interface
submodules.
Glossary-4
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S7-400 and M7-400 Programmable Controllers, Installation Manual
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