Siemens CPU 313C Hardware And Installation Manual page 220

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Modules capable of diagnostics operations report detected system errors to the
Æ CPU via diagnostic interrupts.
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Æ System Diagnostics
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A Æ master which behaves in accordance with EN 50170, Part 3 is known as a
DP master.
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A Æ slave operated on PROFIBUS with PROFIBUS-DP protocol and in
accordance with EN 50170, Part 3 is referred to as DP slave.
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The designation DPV1 means the extended functions of the acyclical services (to
include new interrupts, for example) provided by the DP protocol. The DPV1
functionality has been incorporated into IEC 61158/EN 50170, volume 2,
PROFIBUS.
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The reference potential of the control and on-load power circuits for isolated I/Os is
galvanically separated; e.g. by optocouplers, relay contact or transformer.
Input/output circuits can be connected to a common potential.
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Electrical connection (equipotential bonding conductor) which gives the bodies of
electrical equipment and external conducting bodies the same or approximately the
same potential, in order to prevent disturbing or dangerous voltages from being
generated between these bodies.
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One of the possible responses of the operating system to a Æ runtime error is to
display the error. The other possible responses are: Æ error response in the user
program, CPU STOP.
13-4
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03