Siemens 6ES7341-1BH01-0AE0 CP341 TTY Module

6ES7341-1BH01-0AE0 Siemens CP341 Communication Processor with 20mA TTY Interface

Product Introduction

The 6ES7341-1BH01-0AE0 serves as a spare part communication processor for the SIMATIC S7-300 series. This CP 341 module features a fully isolated 20mA (TTY) serial interface. It handles point-to-point communication with legacy industrial equipment. You can deploy it for ASCII, 3964(R), or RK512 protocols. Furthermore, this CP 341 allows reloadable customer-specific drivers, which makes it ideal for older systems. Note that this module needs an external 24V DC power supply connected via screw terminals.

Technical Specifications of 6ES7341-1BH01-0AE0

Electrical and Power Data

• Rated supply voltage: 24V DC (required)

• Input current from 24V DC L+: max. 200 mA

• Input current from backplane bus 5V DC: max. 70 mA

• Maximum power loss: 4.8 W

Interface and Transmission

• Number of interfaces: 1 (fully isolated)

• Interface type: 20 mA (TTY)

• Connector type: 9-pin sub D connector

• Minimum baud rate: 0.3 kbit/s

• Maximum baud rate: 19.2 kbit/s (physical interface limit)

• Cable length: max. 1000 meters

Supported Protocols and Telegram Length

• 3964(R) protocol: max. 1024 bytes per telegram

• ASCII protocol: max. 1024 bytes per telegram

• RK512 protocol: max. 1024 bytes per telegram

• Reloadable customer-specific drivers: Yes

Transmission Rates by Protocol

• With 3964(R) protocol: up to 76.8 kbit/s

• With ASCII protocol: up to 76.8 kbit/s (0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, and 76.8 kbit/s)

• With RK512 protocol: up to 76.8 kbit/s

• Important note: 76.8 kbit/s only achievable with half duplex

Software and Memory

• Function block length in RAM: max. 5500 bytes for sending and receiving data

Mechanical and Environmental Parameters

Physical Dimensions

• Width: 40 mm

• Height: 125 mm

• Depth: 120 mm

• Weight: approx. 300 g

Connection Method for Power Supply

• 3 screw-type terminals: L+, M, GND

Installation Guide for CP 341 with 20mA TTY

First, insert the 6ES7341-1BH01-0AE0 into an available slot on your S7-300 rack. Then connect the external 24V DC supply to the L+, M, and GND screw terminals. Meanwhile, attach your 20mA TTY device using a 9-pin sub D connector. This CP 341 supports cable runs up to 1000 meters, which is significantly longer than RS232. Next, configure the protocol using the software on the included CD. Finally, load your custom driver if standard protocols do not fit your needs. Remember that the 6ES7341-1BH01-0AE0 supports reloadable drivers for maximum flexibility.

Packaging List for 6ES7341-1BH01-0AE0

• 1 x SIMATIC CP 341 communication processor (6ES7341-1BH01-0AE0)

• 1 x Configuration package on CD

• No certificates or warranty documents included

Shipping Method: FedEx, UPS, DHL

Frequently Asked Questions (FAQ)

1. What is the main difference between the 6ES7341-1BH01-0AE0 and the RS232 version?
The 6ES7341-1BH01-0AE0 uses a 20mA TTY interface instead of RS232. This allows a much longer cable length of up to 1000 meters, compared to only 15 meters for RS232.

2. Does this CP 341 module require external power?
Yes, it does. You must connect a separate 24V DC supply to the L+, M, and GND terminals. The backplane bus alone cannot power this module.

3. What is the actual maximum transmission rate for the 20mA interface?
The physical 20mA interface supports up to 19.2 kbit/s. However, the protocol drivers (ASCII, 3964R, RK512) can run up to 76.8 kbit/s in half-duplex mode.

4. Can I use my own custom protocol with the 6ES7341-1BH01-0AE0?
Absolutely. Unlike the CP 340, this 6ES7341-1BH01-0AE0 supports reloadable customer-specific drivers, giving you full flexibility for non-standard applications.

5. Is the 20mA TTY interface electrically isolated?
Yes, the interface on this CP 341 is fully isolated. This protects your S7-300 system from ground loops and electrical noise, especially over long cable runs.