Siemens S7-1200 External Encoder and Measuring Probe Connection with G2 (HSC + Technology Objects)

[Erkan Teskancan]

🔧 Application Summary:​

Siemens has provided an application example for the SIMATIC S7-1200 G2 series, enabling the connection of external encoders and measuring probes via high-speed counter (HSC) inputs. This example also includes integration with Motion Control Technology Objects (TO).

🧩 Key Components Used:​

• LHSCTO_HSCEncoder function block: Establishes a connection between HSC and TOs.
• TO_ExternalEncoder: Using an external encoder as a leading value.
• TO_PositioningAxis: Using an external encoder as an additional encoder.
• TO_MeasuringInput: Performing measurements with a measuring probe.

⚙️ Supported Configurations:​

1. External Encoder + Measuring Probe: Encoder is used as a leading value.
2. Positioning Axis + External Encoder + Measuring Probe: Encoder is used as an additional encoder.

Both configurations support passive homing and measuring operations.

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📐 Hardware and Software Requirements:​

• CPU: SIMATIC S7-1200 G2 (e.g., 1212FC DC/DC/DC)
• Firmware: V1.0 and above
• TIA Portal: V20
• Encoder: 24V HTL, with A/B signals, 2048 CPR recommended
• Function Blocks: LHSCTO_HSCEncoder, MC_Home, MC_MeasuringInput, etc.

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🛠️ Engineering Steps:​

1. HSC Configuration: HSC inputs are configured for the encoder and measuring probe.
2. TO Creation: Necessary Technology Objects (TO_ExternalEncoder, TO_PositioningAxis, TO_MeasuringInput) are created.
3. Function Block Integration: The LHSCTO_HSCEncoder block facilitates data exchange between HSC and TOs.
4. Simulation: Encoder signals can be simulated using PTO (Pulse Train Output).

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📊 Application Example:​

Siemens provides a sample TIA Portal project and library files for these configurations. These files facilitate quick testing and integration of the application.