Glossary
Glossary-4
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
The diagnostic buffer is a retentive area of memory within the S7-400
CPU which stores the diagnostic events in the order they occurred.
Modules with diagnostics capability signal system errors to the S7-400
CPU by means of diagnostic interrupts.
E
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.
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.
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.
When the operating system detects an error (for example, STEP 7
access error), it calls the specific organization block (error OB) for this
error, where the further response of the CPU can be specified.
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.
The expansion module of M7-400 is connected with the CPU via an
ISA bus interface and accommodates up to three interface
submodules.
Diagnostic Buffer
Diagnostic
Interrupt
Electromagnetic
Compatibility
(EMC)
Equipotential
Bonding
Error Display
Error Handling
via OB
Error Response
Expansion Module
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