Schneider A020 plus AEG Modicon PLC

Compact Control for Small Automation Systems

The Schneider A020 plus serves as a compact programmable logic controller for small machines. This unit integrates processor, power supply, and I/O in one housing. It suits conveyor control, packaging machines, and simple process applications.

Technical Specifications

Parameter	Specification
Model	A020 plus
Category	AEG Modicon PLC
Height	90 mm
Width	132 mm
Depth	75 mm
Weight	0.550 kg
Processor	8-bit at 10 MHz
Program Memory	16 KB EEPROM
Data Memory	4 KB RAM
User Program Size	8 KB max
Execution Speed	1 µs per boolean instruction
Digital Inputs	12 x 24 V DC (sink/source)
Digital Outputs	8 x relay (2 A at 250 V AC)
Input Response Time	8 ms typical
Output Response Time	10 ms typical
Timers/Counters	64 each (max)
Communication Port	1 x RS-232 (programming)
Power Supply	100-240 V AC (built-in, 50/60 Hz)
Power Consumption	20 VA typical
Status Indicators	20 x LEDs (PWR, RUN, ERR, I/O status)
Internal Components	1 CPU board, 1 power supply board, 1 EEPROM chip, 1 battery
Energy Storage	200 mAh lithium battery (RAM backup)

Processor Architecture and Memory Organization

The A020 plus uses an 8-bit processor running at 10 MHz. This processor executes boolean instructions in just 1 microsecond. The module stores user programs in 16 KB of EEPROM memory. It keeps runtime data in 4 KB of battery-backed RAM. The Schneider A020 plus supports up to 64 timers and 64 counters. Its compact design suits small control cabinets with limited space.

Built-in I/O and Field Connections

This AEG Modicon PLC features 12 digital input channels on board. Each input accepts 24 V DC signals from sensors and switches. Eight relay output channels switch loads up to 2 amperes at 250 V AC. The relay outputs suit motor starters, solenoids, and indicator lamps. The A020 plus includes 20 status LEDs for I/O point monitoring. Green LEDs show input and output states at a glance.

Programming and Communication Features

The Schneider A020 plus programs using AEG Modicon compatible software tools. A built-in RS-232 port connects directly to a PC for program download. The module supports ladder logic programming language only. You can monitor and force I/O points through the programming port. The A020 plus stores the user program permanently in EEPROM memory. No battery backup is necessary for the program itself.

Physical Dimensions and Installation Guidelines

The Schneider A020 plus weighs 0.550 kilograms for DIN rail or panel mounting. Its height measures 90mm, width 132mm, and depth 75mm. Install this PLC on standard 35 mm DIN rail inside the cabinet. The unit consumes 20 VA of power from the AC supply. It operates reliably from 0°C to +55°C ambient temperature. Use screw terminal connections for all field I/O wiring.

Energy Storage and Battery Maintenance

The A020 plus uses a 200 mAh lithium battery for RAM data backup. This battery preserves runtime data, counters, and timers during power loss. The battery lasts approximately three years under normal conditions. Replace the battery when the low battery LED indicator lights up. Always replace the battery with the Schneider A020 plus powered on. The module loses no data during battery replacement with power applied.