SIEMENS
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Siemens IK PI · 2015
AS-Interface
Masters
Masters for SIMATIC S7
CP 343-2P / CP 343-2
4
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Overview
CP 343-2P / CP 343-2
The CP 343-2P is the AS-Interface master for the
SIMATIC S7-300 programmable controller and the ET 200M
distributed I/O station.
The CP 343-2 is the basic version of the module.
The CP343-2P / CP 343-2 performs the following features:
•
Connection of up to 62 AS-Interface slaves
•
Integrated analog value transmission (all analog profiles)
•
Supports all AS-Interface master functions according to the
AS-Interface Specification V3.0
•
Display of the operating state and readiness for operation of
connected slaves by means of LEDs in the front panel
•
Fault indications (e. g. AS-Interface voltage fault, configura-
tion fault) by means of LEDs in the front panel
•
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.
•
With CP 343-2P additionally: 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 direct connection of the
AS-Interface cable
•
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 DESIRED 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 occupies 16 bytes each in the I/O
address area of the SIMATIC S7-300. The digital I/O data of the
standard slaves and A slaves are saved in this area. The digital
I/O data of the B slaves and the analog I/O data can be ac-
cessed with the S7 system functions for read/write data record.
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:
The use of this product requires suitable protective measures
(e.g. network segmentation for IT security among others)
in order to ensure safe plant operation, 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.
With CP 343-2P additionally
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.
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Benefits
•
Shorter start-up times through simple configuration at the
press of a button
•
Using it in the ET 200M distributed I/O system allows flexible
machine-related structures to be constructed
•
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 because the
CP can be used for the SIMATIC S7-300 as well as for the
ET 200M
•
With CP 343-2P additionally: 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 AS-i data decoupling module
(e.g. 3RK1901-1DE12-1AA0) is required for the decoupling,
see page 4/142.
•
Operation with AS-Interface power supply (see page 4/142)
possible without restrictions.
© Siemens AG 2014