Siemens 6AV4012-0AA20-0AB0 Comm Processor

This digital communication processor links SIMATIC S5 systems to external serial devices. It transfers data between the PLC and printers, barcode readers, or scales. You can configure this module for various industrial protocols easily.

Technical Specifications

Parameter	Details
Brand	Siemens
Model	Siemens 6AV4012-0AA20-0AB0
Category	Digital Communication Processor (SIMATIC HMI Series)
Dimensions (H x W x D)	132 mm x 75 mm x 60 mm
Weight	0.32 kg
Communication Protocol	ASCII, 3964R, or RK512
Physical Interface	1x RS-232 (25-pin D-sub) + 1x RS-422/485 (terminal block)
Data Rate Range	300 bit/s to 38.4 kbit/s
Internal Buffer	4 KB dual-port RAM
Number of Internal Components	1 CPU + 2 UARTs + 1 buffer memory + 1 power regulator
Maximum Cable Length	15 m (RS-232) / 1200 m (RS-422/485)
Data Bits	7 or 8 bits
Parity Options	None, even, or odd
Stop Bits	1 or 2 bits
Power Supply	24 V DC ±20%
Current Draw	180 mA typical
Built-in Energy Storage	220 µF capacitor for buffer retention
Status Indicators	5 LEDs (PWR, TX, RX, ERR, COM)
Protection Rating	IP20
Operating Temperature	0°C to 50°C

Detailed Feature Overview

This processor includes both RS-232 and RS-422/485 interfaces. You can connect to modern devices using the RS-422 port for longer distances. The 4 KB dual-port RAM buffers incoming and outgoing data smoothly.

A 220 µF capacitor retains the buffer during brief power interruptions. Consequently, you avoid losing partially transmitted messages. The data rate reaches up to 38.4 kbit/s for fast communication.

You will find five status LEDs on the front panel. These LEDs show power, transmit activity, receive activity, errors, and active connection. The RS-422 interface supports distances up to 1200 meters.

Installation and Programming

Siemens 6AV4012-0AA20-0AB0 connects to S5 via the backplane bus. Use COM software to configure protocol and serial parameters. Mount this unit on a standard 35 mm DIN rail.