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Siemens IC 10 · 2017
AS-Interface
Masters
Masters for SIMATIC S7
CP 343-2P / CP 343-2
2
■
Overview
CP 343-2P / CP 343-2
The CP 343-2P communications processor is the AS-Interface
master for the SIMATIC S7-300 and the ET 200M distributed I/O
station, with user-friendly parameterizing options.
The CP 343-2 is the basic version of the module.
The CP 343-2P / CP 343-2 has the following characteristics:
•
Connection of up to 62 AS-Interface slaves
•
Integrated analog value transmission
•
Support of all AS-Interface master functions in accordance
with the AS-Interface Specification V3.0
•
Status displays of operating states and indication of the
readiness for operation of connected slaves by means of
LEDs in the front panel
•
Fault indications (including AS-Interface voltage errors,
configuration errors) by means of LEDs on the front plate.
•
Compact enclosure in the design of the SIMATIC S7-300
•
Suitable for AS-i Power24V (from product version 2/firmware
version 3.1) and for standard AS-i with 30 V voltage
•
Additionally for CP 343-2P: Supports the configuration of the
AS-Interface network with STEP 7 V5.2 and higher
Design
The CP
343-2P / CP 343-2 is connected like an I/O module to the
S7-300. It has:
•
Two terminal connections for connecting the AS-Interface
cable directly.
•
LEDs in the front panel for indicating the operating state and
the readiness for operation of all connected and activated
slaves
•
Pushbuttons for switching over the master operating state and
for adopting the existing ACTUAL configuration of the
AS-i slave as the TARGET configuration
Function
The CP 343-2P / CP 343-2 supports all specified functions of the
AS-Interface Specification V3.0.
The CP 343-2P / CP 343-2 each occupy 16 bytes in the I/O
address area of the SIMATIC S7-300. The digital I/O data of the
standard slaves and A slaves is saved in this area. The digital I/O
data of the B slaves and the analog I/O data can be accessed
with the S7 system functions for read/write data records.
If required, master calls can be performed with the command
interface, e.g. read/write parameters, read/write configuration.
For more information,
see
.
Notes on safety
In order to protect plants, systems, machines and networks
against cyber threats, it is necessary to implement – and contin-
uously maintain – a holistic, state-of-the-art industrial security
concept. Siemens products and solutions represent only one
component of such a concept.
For more information about the subject of Industrial Security,
see
www.siemens.com/industrialsecurity
.
Configuration
All connected AS-Interface slaves are configured at the press of
a button. No further configuration of the CP is required.
Additionally for CP 343-2P
The CP 343-2P also supports configuring of the AS-Interface
network with STEP 7 V5.2 and higher. Specifying the AS-i config-
uration in HW-Config facilitates the setting of slave parameters
and documentation of the plant. Uploading the ACTUAL config-
uration of an already configured AS-Interface network is also
supported. The saved configuration cannot be overwritten at the
press of a button and is therefore tamper-proof.
■
Benefits
•
Shorter start-up times through simple configuration at the
press of a button
•
Design of flexible machine-related structures using the
ET 200M distributed I/O system
•
Provides diagnostics of the AS-Interface network
•
Well suited also for complex applications thanks to connection
options for 62 slaves and integral analog value processing
•
Reduction of standstill and servicing times in the event of a
fault thanks to the LED indicators:
- Status of the AS-Interface network
- Slaves connected and their readiness for operation
- Monitoring of the AS-Interface mains voltage
•
Lower costs for stock keeping and spare parts inventory be-
cause the CP can be used for the SIMATIC S7-300 and also
for the ET 200M
•
Additionally for CP 343-2P: Improved plant documentation
and support for service assignments thanks to a description
of the AS-Interface configuration in the STEP 7 project
•
No need for the AS-i power supply unit with AS-i Power24V:
The AS-Interface cable is supplied through an existing 24 V
DC PELV power supply unit. An S22.5 AS-i data decoupling
module (e.g. 3RK1901-1DE12-1AA0) is required for the de-
coupling,
see page 2/88
.
•
Operation with IP20 AS-Interface power supply
(see page 2/82)
also possible without restrictions
© Siemens AG 2016