Siemens 6GK7343-2AH11-0XA0 SIMATIC NET CP 343-2P AS-Interface Master
01Product Overview
Siemens 6GK7343-2AH11-0XA0 is the SIMATIC NET CP 343-2P communications processor for connecting a SIMATIC S7-300 or ET 200M station to AS-Interface. It is configurable with STEP 7 and implements AS-i Specification V3.0. The module supports up to 62 AS-i devices, 496 input signals and 496 output signals while preserving the established S7-300 module format and backplane-bus integration.
02Performance
Operating Capabilities
- Operates as an AS-Interface master with profile M4.
- Supports one AS-i network with up to 62 addressed devices.
- Processes up to 496 digital input and 496 digital output signals.
- Uses a 5 ms cycle for 31 devices and a 10 ms cycle for 62 devices.
- Supports digital exchange through the process image or peripheral access and analog exchange through data records.
- Provides STEP 7 configuration plus local and command-interface commissioning functions.
Product Identity
- Manufacturer: Siemens
- Model: 6GK7343-2AH11-0XA0
- Product Type: SIMATIC NET CP 343-2P AS-Interface master communications processor
- Status: Exact current lifecycle position should be confirmed for the intended service requirement
03Technical Details
| Manufacturer | Siemens |
|---|---|
| Article Number | 6GK7343-2AH11-0XA0 |
| Product Designation | CP 343-2P |
| Host Systems | SIMATIC S7-300 / ET 200M |
| AS-i Specification | Version 3.0 |
| Master Profile | M4 |
| AS-i Interfaces | 1 |
| Maximum AS-i Devices | 62 |
| Maximum Input Signals | 496 |
| Maximum Output Signals | 496 |
| Cycle Time | 5 ms with 31 devices; 10 ms with 62 devices |
| Configuration | STEP 7, set pushbutton or command interface |
| Connection | 20-pin S7-300 front connector |
| Power Supply | Via S7-300 backplane bus |
| Power Loss | 4 W |
| Degree of Protection | IP20 |
04System Integration
- Select the exact CP 343-2P hardware catalog entry in the maintained STEP 7 project.
- Archive AS-i slave addresses, profiles, configuration data, diagnostic logic and process-image assignments.
- Record all analog data-record calls because they are separate from the digital process image.
- Check the backplane-bus power budget and the 20-pin front-connector wiring.
- Compare the configured AS-i list with the detected network before enabling machine operation.
- Validate slave diagnostics, digital I/O, analog transfers, cycle behavior and any ET 200M redundancy functions.
05Applications
- STEP 7-configured AS-Interface master communication in S7-300 systems.
- ET 200M stations that connect compact field sensors and actuators through AS-i.
- Machines with A/B addressing and up to 62 AS-i devices.
- Automation cells combining digital process-image data with analog data-record transfer.
- Maintenance replacement where the original STEP 7 project and AS-i address plan are available.
- Lifecycle review of installed CP 343-2P modules and their field networks.
06FAQ
What distinguishes the 6GK7343-2AH11-0XA0 identity?
Siemens designates this article as CP 343-2P, a STEP 7-configurable AS-Interface communications processor for S7-300 and ET 200M.
Does the CP 343-2P require a separate external module supply?
The documented module electronics are supplied through the S7-300 backplane bus; the AS-i segment still needs its engineered field supply.
How should an A/B-addressed AS-i network be preserved during replacement?
Archive every slave address and profile, compare the configured and detected lists, and avoid using the set function until the network state is controlled.
Why can analog signals disappear even when digital AS-i data works?
Analog values use data-record transfer, so the PLC calls, record numbers and diagnostics must be restored in addition to the digital process image.
What is the practical device-count timing limit?
The master supports 62 devices, but the documented cycle changes from 5 ms at 31 devices to 10 ms at 62 devices.
Which checks are specific to a CP 343-2P exchange?
Verify the exact STEP 7 catalog entry, backplane slot, front-connector wiring, AS-i address plan, data-record logic and all slave diagnostics before releasing the machine.
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