Siemens EN 50295 manual CP 343-2 P

AS-Interface Master

Masters for SIMATIC S7

CP 343-2 P

■Overview ■Application

The CP 343-2 P 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:

•Supports configuration of the AS-Interface network with STEP 7 V5.2 and higher

•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 errors (incl. AS-Interface voltage errors, configura- tion errors) through LEDs in the frontplate

•Compact housing in the design of the SIMATIC S7-300

■Benefits

•Improved plant documentation and support for servicing thanks to documentation of the AS-Interface configuration in the STEP 7 project

•Diagnosis of the AS-Interface network is supported

•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

The CP 343-2 P is the AS-Interface master connection for SIMATIC S7-300 and ET 200M. Connection to the AS-Interface allows access 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).

The CP 343-2 P functionality is identical to that of the CP 342-2. An old S7 user program can therefore be used with the new CP without any limitations. Also, the AS-Interface configuration can be downloaded or uploaded with the STEP 7 hardware con- figuration.

■Design

The CP 343-2 P 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 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

■Mode of operation

In I/O mode, the CP 343-2 P reserves 16 bytes in the analog	6
address 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.
All connected AS-Interface slaves are configured at the press of
a button. No further configuration of the CP is necessary.

■Function

The CP 343-2 P supports all functions stipulated in the ex- panded 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.

The CP 343-2 P enables the AS-Interface configuration to be read out with STEP 7 V5.2 and higher.

Siemens IK PI · 2004

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