Siemens 6AV3673-1CA31 Control Panel Interface

This device connects operator panels to PLCs and other communication networks. The Siemens 6AV3673-1CA31 converts serial signals for multi-drop RS422/485 networks. It measures 85 mm in width and 55 mm in height. This unit weighs approximately 0.22 kg for DIN rail mounting.

Technical Specifications Table

Parameter	Value
Product Model	Siemens 6AV3673-1CA31
Category	Control Panel Interface / Communication Adapter
Port 1 Type	1 x RS232 (9-pin SUB-D female)
Port 2 Type	1 x RS422/485 (9-pin SUB-D male)
Port 3 Type	1 x TTY (20 mA current loop, terminal block)
Max Cable Length	15 m (RS232), 1200 m (RS422/485), 1000 m (TTY)
Dimensions (W x H x D)	85 mm x 55 mm x 45 mm
Weight	0.22 kg
Internal Components	1 x driver IC, 1 x receiver IC, 1 x optocoupler
Electrical Isolation	500 V AC between RS232 and RS422 sides
Terminal Block	1 x 5-pin screw terminal for TTY
Energy Storage	None (passive signal converter)
Operating Voltage	24 V DC external supply
Power Consumption	120 mA maximum
Mounting Type	DIN rail (35 mm) or panel

Internal Design and Signal Conversion

This interface uses dedicated driver and receiver ICs for signal conversion. An optocoupler provides electrical isolation between the RS232 and RS422 sides. The Siemens 6AV3673-1CA31 supports three communication standards in one compact housing. You can connect TTY devices via the 5-pin screw terminal block. The device converts RS232 signals to RS422/485 for long-distance transmission. Consequently, this interface extends the communication range between panels and PLCs.

Installation and Connection Guide

First, mount this interface onto a standard 35 mm DIN rail inside your cabinet. Next, connect a 24 V DC power supply to the designated terminals. Then, link your operator panel to the RS232 port using a shielded cable. Connect the RS422/485 port to your PLC or network for extended range. Use the TTY terminals for legacy programming devices or printers. The interface automatically detects baud rates up to 9600. This unit works with all SIMATIC OP series panels including OP15, OP17, OP25, and OP27. Always terminate the RS422/485 line with proper resistors for long cable runs.