Technical Specifications

FAQ

1. What is the Siemens 6AG1055-1FB00-7BA2 Expansion Module used for?

The Siemens 6AG1055-1FB00-7BA2 is a SIPLUS LOGO! DM8 230R V8 expansion module designed to increase the digital input and output capacity of a compatible LOGO! 8 controller. It provides four digital inputs and four relay outputs, making it suitable for applications such as pump control, lighting systems, HVAC equipment, and small industrial machines. By adding this module, users can connect additional field devices without replacing the existing basic controller.

2. Which controller is compatible with this expansion module?

This module is designed for the Siemens LOGO! 8 system and is based on the standard module 6ED1055-1FB00-0BA2. Before installation, verify that the existing LOGO! basic module supports this expansion model and that the planned configuration remains within the controller’s expansion limits. Compatibility should be confirmed using the exact basic module model and hardware documentation, particularly when upgrading an existing control panel.

3. What power supply does the 6AG1055-1FB00-7BA2 require?

The module is designed for 230 V AC or 230 V DC operation, with a permissible supply range of 100–253 V DC and an AC frequency range of 47–63 Hz. The supply type and wiring must match the installation requirements. Because the module operates at potentially hazardous voltages, installation and maintenance should be performed by qualified personnel with the equipment isolated according to applicable electrical safety procedures.

4. What types of signals can the four digital inputs accept?

The four digital inputs support AC/DC signals. Under the specified conditions, a signal below 40 V AC or 30 V DC is recognized as logic 0, while a signal above 79 V AC or 79 V DC is recognized as logic 1. Signals in the transition region may not be reliably interpreted. When commissioning the system, verify the field signal voltage and wiring against the input specifications to avoid false triggering or inconsistent input states.

5. What are the characteristics of the four relay outputs?

The module provides four relay outputs with a rated output current of 5 A per output under specified conditions. Relay contacts can switch compatible AC or DC loads, but the permissible switching capacity depends on voltage, load type, and switching frequency. The maximum lamp load is specified as 1,000 W, or 500 W at 115 V AC. External circuit protection is required because the module does not provide short-circuit protection. For inductive loads, suitable suppression devices can help reduce contact wear.

6. What is the benefit of the SIPLUS conformal coating?

The SIPLUS version features conformal coating designed to improve resistance to specified environmental stresses. It is rated for an operating temperature range of -40°C to +70°C, with startup permitted from -25°C under the specified conditions. These characteristics can be useful in industrial installations subject to temperature variation or environmental contamination. However, the coating does not make the module waterproof, and the IP20 rating still requires appropriate enclosure protection for the installation environment.

7. How should the expansion module be installed and commissioned?

The module mounts on a standard 35 mm DIN rail and connects to a compatible LOGO! 8 basic module through the system expansion interface. Before installation, isolate the power supply and confirm that the wiring matches the terminal assignments. After installation, verify the supply voltage, input signal states, and relay output operation. Test each channel using the control program and connected equipment before returning the system to normal service.

8. What should be checked if the module fails to respond to input signals or switch a load?

First, check the supply voltage and confirm that the expansion module is correctly connected to the basic controller. For input problems, measure the incoming AC/DC signal and compare it with the specified logic thresholds. For output problems, inspect the control logic, relay wiring, load current, and external protective devices. If the relay contacts are suspected of damage, isolate the equipment before inspection. Repeated faults may indicate incorrect wiring, excessive load current, or a configuration issue; resolve the underlying cause before replacing the module.