Chapter 8 Communications - GE VersaPoint IC220PBI002 User Manual

Communications
Chapter
8
This chapter describes acyclic communications for module IC220PBI002 in DP/V1
mode.
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Types of Acyclic Communication
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PCP Communication Basics
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Acyclic Communication in DP/V1 Mode
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PCP Communication Via Process Data (Class 1 Master in DP/V0 Mode)
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Format of the Parameter Telegram
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Error Codes for DP/V1 and VC1 Communication
These features are not available with module IC220PBI001, with module
IC220PBI002 in V0 mode, or with some control systems.
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DP/V1 expands the cyclic data exchange function according to IEC 61158
to include acyclic services. This makes it easy to operate even complex
devices.
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Peripherals Communication Protocol (PCP) is used in the I/O Station to
exchange data acyclically. Usually, this is the configuration data for
complex modules such as VersaPoint RS-232 and VersaPoint RS-
485/422 modules.
DP/V1 is a Profibus mechanism that corresponds to PCP. The Profibus NIU
prepares the data records, which are sent via DP/V1 from the Class 1 or Class 2
master, for the PCP mechanism in the l/O Station. PCP data from the backplane
is then converted into DP/V1 telegrams.
If the control system or configuration program does not support DP/V1, it is
possible to use the functions provided by the cyclic process data channel (DP/V0)
as described later in this chapter.
GFK-1911B
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