Siemens SIMATIC S7 6ES7 138-4DF01-0AB0 ET200S Serial Interface Module RS232/RS42

All the best /Klaus

For sale is a Siemens SIMATIC S7 6ES7 138-4DF01-0AB0 ET200S Serial Interface Module in used, good working condition. This module was designed to add reliable serial communication capabilities to ET 200S distributed I/O racks, supporting 1 SI (serial interface) in both RS232 and RS422/RS485 formats with ASCII and 3964R protocols.

Key Features:

• Brand: Siemens

• Model: 6ES7 138-4DF01-0AB0

• Series: SIMATIC S7 ET200S

• Type: Serial Interface Module (1 SI, RS232/RS422/RS485, 3964R/ASCII)

• Supply Voltage: 24 V DC

• Protocols Supported: ASCII, 3964(R)

• Supported Interfaces: RS232 (V.24), RS422/485 (X.27)

• Max Transmission Speed: Up to 115.2 kbit/s (ASCII protocol)

• Cable Length (max): RS232 - 15 m, RS422/RS485 - 1200 m

• Dimensions: 15 x 81 x 52 mm

• Diagnostics: LEDs for Rx (Receive), Tx (Transmit), and SF (group fault)

• Certifications: CE, UL, FM, ATEX (KEMA 01 ATEX 1238X)

• Operating Temp: 0°C to +60°C

• Condition: Used, fully tested

Collector/Background Information:
This module is a sought-after spare for legacy Siemens systems, especially in factories, process plants, and automation setups requiring robust, reliable serial communications to sensors, actuators, or legacy PLCs. Discontinued since October 2023, it is valuable to those maintaining or restoring classic ET 200S installations.

Add a high-quality German-made Siemens module to your rack or collection!