Siemens EN 50295 Benutzerhandbuch
Siemens IK PI · 2004
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AS-Interface Master
Masters for SIMATIC S7
CP 343-2
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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:
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)
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
- 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.
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).
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:
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
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
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.
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.
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.
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.
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.