Siemens 6ES7340-1AH02-0AE0 CP340 RS232C Module

Siemens 6ES7340-1AH02-0AE0 CP340 Communication Processor Introduction

The 6ES7340-1AH02-0AE0 belongs to the SIMATIC S7-300 family. This CP340 module enables serial point-to-point communication. It connects to printers, scanners, and various instruments. Additionally, the RS232C interface is fully isolated. Many engineers prefer this S7-300 communication processor for its low power consumption. Note that this is a later revision than the -1AH01 version.

Technical Specifications of the CP340 Module

This 6ES7340-1AH02-0AE0 draws 165 mA from the 5V DC backplane bus. Typical power loss is only 0.6 W, with a maximum of 0.85 W. The interface type is RS232C (V.24) with complete isolation. Transmission rates range from 2.4 kbit/s up to 19.2 kbit/s. However, the maximum speed depends on your chosen protocol.

The module supports several integrated protocol drivers. First, the 3964(R) protocol runs at up to 19.2 kbit/s. Second, the ASCII protocol reaches a maximum of 9.6 kbit/s. Third, the printer driver mode also operates at 9.6 kbit/s. For telegram length, both 3964(R) and ASCII support 1,024 bytes per message. Note that RK512 is not supported on this model.

Interface and Connection Details

A single isolated RS232C port is available on the 6ES7340-1AH02-0AE0. The connector type is a standard 9-pin sub-D female port. Maximum cable length is 15 meters, which is typical for RS232 specifications. Furthermore, the module supports several printer types out of the box. These include HP Deskjet, HP Laserjet, and IBM Proprinter. You can also define user-specific printer configurations.

The module uses function blocks (FBs) for all data handling tasks. Each FB requires up to 2,700 bytes of load memory in RAM. These blocks manage both sending and receiving operations. For programming, the included configuration CD provides all necessary tools. Customer-specific drivers cannot be reloaded, so choose your protocol carefully.

Power Supply and Electrical Isolation

Power comes exclusively from the backplane bus. The 6ES7340-1AH02-0AE0 does not require a separate 24V DC supply. This simplifies wiring and reduces cabinet space. The isolation between the backplane bus and the RS232 port is a key feature. It protects the CPU from ground loops and electrical noise.

Specifically, the isolation voltage is rated at 500 V DC. This ensures reliable operation in industrial environments. Many field devices like weigh scales and barcode readers benefit from this protection. Moreover, the low heat generation means no additional cooling is needed.

Ambient Conditions and Operating Environment

The 6ES7340-1AH02-0AE0 operates within a temperature range of 0°C to 60°C. This covers most standard industrial cabinet environments. Storage temperatures can range from -25°C to 70°C. The module is designed for indoor use only. Relative humidity should remain below 95% without condensation.

For vibration resistance, the module meets IEC 60068-2-6 standards. Shock resistance follows IEC 60068-2-27. These specifications make the S7-300 CP340 suitable for factory floor installations. However, avoid mounting it directly next to high-vibration equipment like large contactors.

Mechanical Dimensions and Mounting

The 6ES7340-1AH02-0AE0 has a slim width of only 40 mm. Height is 125 mm, and depth is 120 mm. This narrow design saves valuable rack space in your S7-300 system. Weight is approximately 300 grams. The module snaps directly onto the standard S7-300 mounting rail.

For cooling, natural convection is completely sufficient. No fan or additional ventilation is required. The front panel includes status LEDs for transmit, receive, and error conditions. These LEDs help with quick diagnostics during commissioning.

Installation Guide for the CP340 Communication Processor

First, power down your S7-300 system completely. Next, locate an empty slot on the rack. Then, hook the 6ES7340-1AH02-0AE0 onto the top rail. Swing it downward until the latch clicks into place. Secure the module with the retaining screw at the bottom.

After mounting, connect your RS232C cable to the 9-pin sub-D port. Ensure the cable length does not exceed 15 meters. For best signal integrity, use shielded cables with proper grounding. Then, power up the system and download the configuration from STEP 7. Finally, test the communication using the CP340 diagnostic tools.

Do not connect the RS232 port to RS422 or RS485 devices. The voltage levels are incompatible and may damage the module. Furthermore, avoid removing or inserting this module while power is on. Always power off before any hardware changes.

Packaging List of the 6ES7340-1AH02-0AE0

• One Siemens 6ES7340-1AH02-0AE0 CP340 communication processor

• One configuration package on CD

• One quick reference leaflet

Frequently Asked Questions (FAQ)

1. What is the difference between 6ES7340-1AH01-0AE0 and 6ES7340-1AH02-0AE0?
The -1AH02 version has slightly improved power loss specifications. Typical power loss dropped from unspecified to 0.6W. Otherwise, both modules are functionally identical. The 6ES7340-1AH02-0AE0 is the newer revision.

2. Can this module communicate with a Modbus device?
Not directly. The 6ES7340-1AH02-0AE0 does not have a native Modbus driver. You would need to implement Modbus RTU over the ASCII protocol. Alternatively, consider a CP341 for native Modbus support.

3. Does the module support 9-bit data framing?
Yes. The ASCII protocol on this S7-300 CP340 supports 8-bit and 9-bit data frames. This is useful for certain proprietary device protocols. Consult the manual for specific configuration steps.

4. How do I update the configuration software?
The included CD contains the initial software. For updates, visit the Siemens support website. Search for "CP340" and download the latest HSP (Hardware Support Package). Then import it into STEP 7.

5. What shipping options are available for this CP340 module?
We ship exclusively via FedEx, UPS, and DHL. All orders are processed within 24 hours. Tracking numbers are sent directly to your email address upon dispatch.