8/2/2019 Interconnection Types With S7-200
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QUESTION:Which types of interconnection can I use with
S7-200?
ANSWER:The S7-200 supports the following communications
protocols and bus systems:
PPIThe S7-200 system protocol for communications between S7-200
components such as CPUs,TD200s, OPs and programmers is available to
you. The PPI protocol permits you to operate severalmasters in the
network simultaneously. You can program data communications between
CPUs withjust two statements.
FREEPORTUsing the free ASCII protocol you can program
user-specific communications protocols. In this wayyou can connect
other devices such as printers, barcode readers, modems or PCs. You
can also useit to program other protocols such as Modbus protocol
(widely-used industrial bus protocol) and USS-5 protocol (protocol
for MicroMaster drives). Of course, you can also use it for data
communications
between several CPUs.
PROFIBUSThe CPU215 and the CP242-8 (=PROFIBUS slave+AS interface
master), each with a built-inPROFIBUS slave interface, each provide
a connection option for the S7-200 to the PROFIBUS. Thisone of the
most widely used neutral standard bus systems in the industry. In
each case you can sendand receive up to 64 bytes to and from the
S7-200 from and to a PROFIBUS master respectively. TheCPU215 and
CP242-8 also permit you to set up two redundant connections to a
PROFIBUS network,thus guaranteeing to a great extent failsafe
operations.
MPIThe latest S7-200 CPUs can as MPI slaves exchange data with
the controllers of the S7-300/400 viathe X_PUT and X_GET
statements.
AS INTERFACEThis is a powerful field bus system with which you
can operate many different types of actuators andsensors. A maximum
bus cycle time of 5ms is guaranteed. The bus consists of a two-wire
line ofprotection class IP65 (splash-proof). Using the AS INTERFACE
greatly reduces wiring and assemblyoutlay. Above all, it is much
easier subsequently to connect other devices. The S7-200 is
connectedwith the AS Interface master module CP242-2 on which you
can operate up to 31 AS Interface slaves.Each AS Interface slave
can have up to 4 inputs and/or 4 outputs, i.e. at a maximum of 2
possible ASInterface masters on one S7-200 you can operate up to
496 AS Interface I/Os.
Entry ID:733797 Date:1999-02-01
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