Technical Specifications

FAQ

1. What are the main functions of the 6AG1223-1QH32-4XB0 module?

The 6AG1223-1QH32-4XB0 is a SIPLUS SM 1223 digital input/output module designed for Siemens SIMATIC S7-1200 automation systems. It provides eight AC digital inputs and eight relay outputs. The inputs acquire switching signals from compatible 120/230 V AC field devices, while the relay outputs control external loads within the specified electrical ratings. Typical applications include industrial machinery, production lines, equipment monitoring, and automated control cabinets. Its conformal-coated circuit board provides additional environmental protection for applications operating under the specified conditions.

2. What types of field devices can be connected to the digital inputs?

The module supports eight digital inputs designed for 120/230 V AC signals, with input characteristics compliant with IEC 61131 Type 1. Compatible devices may include AC-operated switches, auxiliary contacts, and other field devices that provide suitable AC switching signals. The input recognizes a low signal at approximately 20 V AC with a current of 1 mA and a high signal at approximately 79 V AC with a current of 2.5 mA. Before connecting equipment, verify the actual signal voltage, terminal assignments, and electrical characteristics. These inputs are intended for AC signals and should not be treated as standard 24 V DC inputs.

3. What are the electrical specifications of the relay outputs?

The module provides eight relay outputs with a rated switching current of up to 2 A per channel under the applicable operating conditions. The contacts support switching voltages from 5 to 30 V DC or from 5 to 250 V AC. They can control compatible contactor coils, interface relays, indicator circuits, and other industrial loads. The permitted switching capacity depends on the load type and operating conditions. For horizontal installation at ambient temperatures up to 50°C, the documented maximum total current per output group is 8 A. Relay contacts are mechanical components, so switching frequency, inrush current, and load characteristics affect service life. Suitable suppression devices may be needed for inductive loads.

4. What are the benefits of the SIPLUS conformal coating?

The SIPLUS version incorporates a conformal coating on the circuit board to improve resistance to certain environmental contaminants. This design supports use in industrial environments where additional protection of electronic assemblies is required. The specified operating temperature range for the 6AG1223-1QH32-4XB0 is -20°C to +60°C. However, the coating does not make the module waterproof or eliminate the need for suitable enclosure protection. Installation conditions must remain within the manufacturer’s specifications, and the module should be protected from unsuitable exposure to liquids, conductive contamination, and excessive condensation. Correct mounting, wiring, and environmental management remain important for long-term reliability.

5. What power supply and installation conditions does the module require?

The module uses a rated 24 V DC supply, with a permissible voltage range of 20.4–28.8 V DC. Its maximum backplane bus current consumption is 120 mA at 5 V DC, and its typical power dissipation is 7.5 W. The AC input circuits operate at 120/230 V AC, while the relay coils use a 24 V DC control supply. These circuits must be wired according to the relevant terminal diagram and electrical safety requirements. During installation, separate AC signal wiring from low-voltage control wiring as required by the applicable standards. Before commissioning, verify the supply voltage, protective devices, grounding arrangements, and connector security.

6. How should the module be configured in a SIMATIC S7-1200 system?

The module should be configured in the PLC engineering project using the exact hardware order number and a compatible hardware catalog entry. After adding the module, assign and verify the input and output addresses, then confirm that the configured arrangement matches the physical installation. The eight AC inputs should be connected to compatible field signals, while the eight relay outputs should be mapped to the corresponding control functions in the PLC program. During commissioning, test each input separately and monitor its status in the engineering software. Then verify the relay outputs under controlled conditions. If the module is being used as a replacement, check CPU compatibility, firmware requirements, wiring, and address assignments before returning the system to service.

7. How can input signal detection problems be diagnosed?

If a digital input fails to change state, first measure the AC voltage at the field device and the corresponding module terminal using an appropriately rated instrument. Confirm that the voltage meets the input switching requirements and inspect the field wiring, terminal connections, and protective devices. Next, compare the physical input status indicator with the corresponding input state in the PLC engineering software. If the voltage is correct but the input state remains unchanged, review the hardware configuration, address mapping, and available diagnostic information. Check whether the problem affects one channel or several channels, as this can help distinguish an individual wiring fault from a shared supply or configuration issue. Never use an incompatible DC voltage as an improvised test signal.

8. What should be checked if a relay output fails to switch a load?

First, confirm that the PLC program is issuing the expected output command and that no interlock or operating condition is preventing activation. Check the external load supply, relay contact wiring, terminal connections, and load compatibility. Verify that the load voltage and current remain within the permitted switching ratings and that the total current per output group is not exceeded. If the output command is active but the load does not respond, inspect the external circuit and consider relay contact wear, excessive switching frequency, or damage associated with inductive loads. Short-circuit protection is not integrated into the outputs, so suitable external protection must be provided. Isolate the relevant power supply before inspecting wiring or components, and complete controlled functional tests before restoring normal operation.