Messung 4433 Mixed I/O Expansion Module

The Messung 4433 (often branded under the NextGen 4000 or X-line series) is a versatile Mixed I/O Expansion Module used with Messung PLCs. It is a highly popular module in the Indian automation market, especially for small-to-medium machines where a combination of digital and analog signals is required in a single compact footprint.

1. I/O Configuration

The “4433” model is specifically designed to handle a variety of signal types, reducing the need for multiple separate cards.

• Digital Inputs: 8 Points (24V DC, Sink/Source).

• Digital Outputs: 8 Points (Transistor or Relay, depending on the specific sub-version).

• Analog Inputs: 4 Channels (Configurable for 0–10V, 4–20mA, or RTD/Thermocouple).

• Analog Outputs: 2 Channels (Typically 0–10V or 4–20mA).

2. Connectivity and Mounting

• Backplane Connection: Connects to the main PLC CPU via a ribbon cable or a proprietary slide-in bus connector (depending on the chassis type).

• Terminal Blocks: Features pluggable screw-type terminals for easy wiring and maintenance.

• Mounting: Standard 35mm DIN rail mounting.

3. Technical Specifications

4. Key Advantages

• Space Saving: By mixing digital and analog on one card, it occupies significantly less space on the DIN rail than four separate specialized modules.

• Cost Effective: Lower hardware cost for machines that only need a few analog points alongside standard digital control.

• Flexibility: The analog inputs are often universal, meaning they can be software-configured to read a pressure transmitter (4-20mA) or a temperature sensor (RTD) without changing the hardware.

5. Maintenance and Troubleshooting

• I/O LEDs: If a digital input is physically triggered but the corresponding LED on the 4433 module does not light up, check the Common (COM) wiring for that bank.

• Analog Jumper Settings: Some older versions of this module require internal jumpers or DIP switches to be set to toggle between Voltage (0–10V) and Current (4–20mA) modes.