Technical Specifications

FAQ

1. What is the Siemens 6AG1055-1HB00-7BA2 Expansion Module used for?

The Siemens 6AG1055-1HB00-7BA2 is a SIPLUS LOGO! DM8 24R expansion module designed to increase the digital input and output capacity of compatible LOGO! 8 controllers. It provides four digital inputs and four relay outputs, making it suitable for pump control, lighting automation, HVAC systems, and small industrial machines. It allows additional field devices to be integrated into an existing control system without replacing the basic controller.

2. Which controller is compatible with the 6AG1055-1HB00-7BA2?

This expansion module is designed for the Siemens LOGO! 8 system and is based on the standard module 6ED1055-1HB00-0BA2. Before installation, verify that the LOGO! basic module supports this expansion model and that the overall configuration remains within the controller’s supported expansion limits. Compatibility should be checked against the exact controller model and hardware documentation, particularly when adding the module to an existing control cabinet.

3. What power supply does this expansion module require?

The module supports a nominal supply voltage of 24 V DC or 24 V AC. The permissible DC supply range is 20.4–28.8 V, while the specified AC frequency range is 47–63 Hz. Confirm the supply type and terminal assignments before connecting the module. An unstable or incompatible supply can lead to incorrect input detection or unreliable operation. During commissioning, measure the voltage at the module terminals and ensure that the power supply has sufficient capacity for the complete control system.

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

The four digital inputs accept compatible AC/DC signals and support specified NPN input configurations. A signal below 5 V AC/DC is recognized as logic 0, while a signal above 12 V AC/DC is recognized as logic 1 under the specified conditions. Signals within the transition range may not be interpreted reliably. When connecting sensors or switches, verify their electrical output characteristics and wiring requirements. Proper signal grounding and separation from noisy power circuits can also help reduce false triggering.

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

The module provides four relay outputs, each rated for up to 5 A under specified operating conditions. Relay contacts can switch compatible AC or DC loads, but the permitted switching capacity depends on the load type, voltage, and switching frequency. The specified maximum lamp load is 1,000 W. Because short-circuit protection is not integrated, external circuit protection must be provided. For inductive loads such as contactor coils and solenoid valves, suitable suppression components can reduce contact wear and improve switching reliability.

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

The SIPLUS version features conformal coating intended to improve resistance to specified environmental stresses. It supports an operating temperature range of -40°C to +70°C, with startup permitted from -25°C under the specified conditions. These characteristics make it suitable for certain industrial environments with temperature fluctuations or increased environmental exposure. However, the coating does not make the module waterproof, and its IP20 rating remains applicable. A suitable enclosure and proper installation are still necessary where dust, moisture, or condensation may occur.

7. How should the module be installed and commissioned?

The module is designed for mounting on a standard 35 mm DIN rail and connects to a compatible LOGO! 8 basic module through the system expansion interface. Before installation or wiring, isolate the power supply and follow the applicable electrical safety procedures. After mounting, check the supply voltage, input connections, relay wiring, and load ratings. Configure the expansion module in the control system as required, then test each input and output individually. Confirm that the connected equipment responds correctly before returning the machine to normal operation.

8. How can input or output faults be diagnosed on this module?

Start by checking the power supply and confirming that the expansion interface is securely connected to the LOGO! basic module. If an input does not respond, measure the signal at the relevant terminal and compare it with the specified logic thresholds. If a relay output fails to switch, inspect the control program, relay contacts, external wiring, load current, and protective devices. Disconnect power before inspecting wiring or suspected damaged contacts. If the fault persists, review the controller configuration and test the module in a known-compatible system before deciding whether replacement is necessary.