Siemens ISI EN 50295 - Manual (Page 37)

Siemens IK PI · 2004 6/37
AS-Interface Master
Masters for SIMATIC S7
CP 343-2
6
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Overview
The CP 343-2 is the AS-Interface master for PLC SIMATIC
S7-300 and the distributed I/O device ET 200M. The communi-
cations processor offers the following functions:
• Connection of up to 62 AS-Interface slaves and integrated an-
alog value transmission (according to expanded AS-Interface
Specification V2.1)
• Supports all AS-Interface master functions according to ex-
panded AS-Interface Specification V2.1
• Display of operating status and operational readiness of the
connected slaves through LEDs in the frontplate
• Display of errors (incl. AS-Interface voltage errors, configura-
tion errors) through LEDs in the frontplate
• Compact housing in the design of the SIMATIC S7-300
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Benefits
• Shorter startup times due to easy configuration at the press of
a button
• Flexible decentralized topologies can be constructed by using
this communications processor in the ET 200M DP slave.
• Reduction of standstill or service times in the event of a fault
through LED displays:
- status of the AS-Interface network
- connected slaves and their operational readiness
- monitoring of the AS- Interface voltage level
• Reduced costs for spare parts inventories because the CP can
be used in both the SIMATIC S7-300 and in ET 200M.
• Ideal for complex applications through the connection option
of 62 slaves and integrated analog value processing
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Application
The CP 343-2 is the AS-Interface master connection for SIMATIC
S7-300 and ET 200M. Connection to the AS-Interface allows ac-
cess to max. 248 DI/186 DO per CP.
The integrated analog value processing also supports evalua-
tion of very simple analog signals (per CP at max. 31 analog
slaves, each with four channels).
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Design
The CP 343-2 is connected to the S7-300 like an expansion
module. It features:
• Two terminals for direct connection of the AS-Interface cable
• LEDs in the frontplate for displaying the operating status and
the operational readiness of all connected and activated
slaves
• Pushbuttons for displaying the status information of the slaves,
for switching the operating status and entering the existing
ACTUAL configuration as the SETPOINT configuration
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Function
The CP 343-2 supports all functions stipulated in the expanded
AS-Interface Specification V2.1. Double address assignment (A-
B) makes it possible to operate up to 62 digital or 31 analog
slaves at the AS-Interface. Access to analog values is easy
thanks to the integrated analog value processing.
All connected AS-Interface slaves are configured at the press of
a button. No further configuration of the CP is necessary.
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Mode of operation
In I/O mode, the CP 343-2 reserves 16 bytes in the analog ad-
dress space of the SIMATIC S7-300. The I/O data of the standard
slaves or A slaves is stored here. The I/O data of the B slaves can
be accessed using the "read/ write data record “ function.
A and B slaves are slaves in accordance with the extended
AS-Interface specification V2.1. For the AS-Interface master
calls (e.g. Write parameter, read diagnostic values), a Function
Call (FC) is provided on the diskette that accompanies the
manual.