Specifications
AS-Interface
Masters
Masters for SIMATIC S7
CP 343-2P, CP 343-2
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Siemens IK PI · 2012
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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 and the ET 200M distributed I/O station, with
user-friendly parameterizing options.
The CP 343-2 is the basic version of the same module.
The CP 343-2P / CP 343-2 has 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
• Status displays of operating states and indication of the read-
iness for operation of connected slaves by means of LEDs in
the front panel
• Fault indication (e.g. AS-Interface voltage fault, configuration
fault) by means of LEDs in the front panel
• Compact enclosure in the design of the SIMATIC S7-300
• Suitable for AS-i Power24V (product version 2 and higher /
firmware version 3.1) and standard AS-i (30 V)
• Extra with the CP 343-2P: Supports detailed 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
extended 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.
If required, master calls can be performed with the command
interface FC ASI_3422, e. g. read/write parameters, read/write
configuration. The FC including a STEP7 sample program can
be downloaded from the Internet at:
http://support.automation.siemens.com/WW/view/en/5581657
Configuration
All connected AS-Interface slaves are configured at the press of
a button. No further configuration of the CP is required.
Additional features of the 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.
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Benefits
• Shorter start-up times through simple configuration at the
press of a button
• Construction of flexible distributed structures by use in the
DP-slave ET 200M
• Provides diagnostics of the AS-Interface networks
• 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
• Extra with the 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 AS-i data
decoupling module (e.g. 3RK1 901-1DE12-1AA0) is required
for the decoupling, see page 136.
• Operation with an AS-Interface power supply unit
(e.g. 3RX9 501-0BA00, see page 135) is also possible without
restrictions.
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© Siemens AG 2011