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:

• As many as 62 AS-Interface slaves can be connected
• Integrated analog value transmission
• Supports all AS‑Interface master functions according to 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 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 (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 functional readiness of all connected and active 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 extended 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.

More information, see https://support.industry.siemens.com/cs/ww/en/view/51678777.

Notes on safety

In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens products and solutions only represent one component of such a concept.

For more information on the topic of Industrial Security, see http://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 configuration in HW-Config facilitates the setting of slave parameters and documentation of the plant. Uploading the ACTUAL configuration 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.