/PLC-Analog-Input-Processing--0-10VDC

Siemens PLC S7-1200 DC/DC/DC with Signal Generator

"Processing Analog Input, 0-10VDC" in Industrial Automation Towards Industry 4.0.

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Siemens PLC: SIMATIC S7-1200 Compact PLC, DC/DC/DC

  • CPU 1214C, compact CPU
  • DC/DC/DC
  • Onboard I/O: 14 DI 24 V DC; 10 DO 24 V DC; 2 AI 0-10 V DC
  • Power supply: DC 20.4-28.8V DC
  • Program/data memory 100 KB

Hardware, Software & Wiring Configuration

Hardware

  • Power Supply
    • 1x External Siemens PSU (Input 220VAC 1 Phase, Output 24VDC).
  • CPU
    • 1x Siemens Compact PLC 1200 DC/DC/DC.
  • Digital Input
    • 1x Start Push Button(NO) %I0.1.
    • 1x STOP Push Button (NC) %I0.0.
  • Analog Input
    • channel 0, %IW64.
  • Signal Generator
    • 1x Signal Generator to Analog Input Channel 0.
    • only use signal ground (GND) and AVo (output, voltage).
    • powered by an external USB cable.
    • set the mode on Signal Generator to Voltage (press the mode button to switch between voltage & current).
  • Digital Output
    • 5x 24VDC Lamps %Q0.0 (Blue), %Q0.4 (Red), %Q0.5 (Yellow), %Q0.6 (Green), %Q0.7 (White).
  • Cabling
    • AWG 16 with ferrules.
  • Cabling (color)
    • 220VAC Live: brown, 220VC Neutral: blue.
    • 24VDC+: red, 24VDC common: black.
    • 24VDC Digital Input: white.
    • 24VDC Digital Output: orange.
    • 24VDC Common: black.
    • Analog Input: yellow.
  • PLC Firmware level (updated from base 4.5)
    • 4.6.0. Hardware Configuration change in PLC
  • Utilize Realtime Clock (RTC).
    • through TIA portal, devices & network -> system & clock memory -> enable the use of clock memory byte.
    • download to PLC (hardware configuration). Connectivity
  • Laptop to PLC
    • RJ45.
    • straight cable wiring as Siemens 1200 PLC can autocross on the ethernet cable. Application Software
  • Siemens TIA Portal v17 on Windows 11.

Programming Logic

  • If the Start Push Button (NO) is pressed, the program runs, and the Start Push Button is latched.
  • It continuously monitors the analog input, normalizes and scales the analog input appropriately, and energizes the programmed output ports based on the normalized and scaled values.
  • Red: if the analog signal is between 0.0–2.5VDC.  * Yellow: if the analog signal is between 2.5–5VDC.  * Green: if the analog signal is between 5–7.5VDC.  * White: if the analog signal is between 7.5–10.0VDC.
  • If the Stop Push Button (NC) is pressed, the Start Push Button is un-latched, and the program stops.