Video summary

Belajar PLC - Siemens S7-1200 & TIA Portal Dasar Lengkap | Wiring, LD, NO NC, Interlock, Timer

Main summary

Key takeaways

Technology

Video summary (technological concepts, features, and tutorials)

This video is a beginner guide to Siemens PLCs (S7-1200) using TIA Portal, covering:

  • Hardware overview and key features
  • Wiring basics
  • Basic Ladder Logic (LD) programming
  • Interlock / latch logic (latch/unlatch / set-reset)
  • Timers: TON, TOF, TP, and an accumulating/resume-like timer variant

The presenter notes that PLC learning is conceptually similar across brands, while software/hardware details differ.

1) Learning scope & context

  • The creator explains that PLC programming concepts are mostly consistent across brands.
  • This series specifically uses Siemens as the reference platform for learning.
  • Future emphasis includes:
    • More Siemens S7-1200 variants
    • Additional PLC concepts in later parts

2) Siemens S7-1200 hardware overview (example CPU: CPU 1212C AC/DC/relay)

Key blocks/features explained

CPU operation / program execution

  • After downloading, the program is stored in CPU memory.
  • The CPU continuously:
    • Monitors inputs
    • Updates outputs based on logic

Communication

  • Built-in Profinet over Ethernet
    • Mentions network configuration
    • References optional modules for other protocols (e.g., Profibus)

Power

  • Example input voltage: 120/200…220 VAC (AC input)
  • The PLC includes an internal power supply converting AC to 24V DC
    • Therefore, external 24VDC wiring may not be required
    • Caution: don’t feed 24V into the “wrong” input type on the AC model

I/O count (for the specific model example)

  • Example mentioned: 8 digital inputs, 2 analog inputs, 6 relay outputs

Digital input wiring concept

  • Digital inputs require 24V DC
  • Notes that inputs are “active” when the DC is present
  • Mentions current limit (about ~6 mA per input)

Relay outputs

  • Relay-based outputs (relay/coil) are contrasted with transistor outputs.
  • Relay outputs can switch AC or DC loads
    • Example: wiring a 220VAC lamp to relay output terminals

Other physical features covered

  • LED indicators (input/output status)
  • Memory card slot (to save/record values)
  • Status indicators (RUN/STOP, error/maintenance)
  • Profinet/LAN connector using RJ45 Ethernet
  • MAC address mention

3) Wiring tutorial (practical examples)

Digital inputs using push buttons

  • Use the PLC input group common/reference (mentions connecting to M / common)
  • Apply 24V DC to activate input 0
  • Removing 24V deactivates the input

Analog input using a potentiometer

  • Analog input range described as 0–10V DC
  • Potentiometer wiring:
    • 0V left → 10V right
    • ~5V in the middle position
  • Conversion to digital:
    • Mentions 10-bit resolution
    • Also references a “2 × 10-bit” concept for analog channels

Digital relay outputs to an indicator lamp

  • Relay terminals switch the load power
  • Example:
    • Connect a 220VAC lamp to relay output terminals intended for AC
    • Use 24V DC on other terminals as needed

Ethernet cable connection

  • Uses Ethernet to:
    • Program/download to the PLC
    • Communicate for monitoring

4) TIA Portal tutorial: project setup

Demonstrated steps and UI items

  • Opens TIA Portal v15
  • Creates/opens a Project and configures initial setup/welcome tour
  • Adds the controller/device
    • Selects CPU 1212C with relay outputs
  • Mentions project structure including:
    • Device configuration
    • Network/topology
    • Hardware catalog (modules)
    • Program blocks

IP and connection checks

  • Configures Ethernet IP (example: 192.168.0.110)
  • Ensures PC and PLC are on the same network segment
  • Uses Ping to verify connectivity
  • Downloads/compiles and goes online to monitor logic execution

5) Ladder Logic (LD) basics: contacts and coils (ENO/NEG, NO/NC)

Ladder symbols covered

  • Normally Open (NO/EN) contact behavior
  • Normally Closed (NC/NEG) contact behavior
  • Coils for output activation

Conceptual explanation

  • If NO contact condition is not satisfied:
    • Circuit is open → coil is off
  • If NO contact condition is satisfied:
    • Current flows → coil energizes
  • NC behaves in the opposite conditions

Mini-program example

  • When Input 0 is ON → Output Q0.0 turns ON
  • Emphasizes “professional” addressing by defining tags/addresses first
    • Example style: I0.0, Q0.0 (and later memory bits)

6) Interlock / latch logic (Set/Reset) using memory bits

Why interlock is needed

  • Pushbuttons are momentary.
  • Logic is required to keep output ON after release until a stop condition occurs.

Two methods demonstrated

  1. Interlock using NO/NC + memory bit (M)

    • Uses an internal memory bit (example M0.0) as a “virtual latch”
    • Start condition sets/maintains the latch
    • Stop condition clears the latch using NC logic

  2. Siemens Set/Reset instructions

    • Set (S) latches the output ON after start
    • Reset (R) turns it OFF after stop

Monitoring behavior

  • Output stays ON after start button release.
  • Output turns OFF only when the reset/stop condition is activated.
  • Tested by going online and observing output/indicator states.

7) Timers tutorial in TIA Portal

The video teaches how to use timer blocks and combine them with latch logic.

TON (Timer ON / “on-delay”)

  • When input is ON:
    • Output Q becomes 1 after the preset time
  • When input goes OFF:
    • Behavior returns to OFF (as explained in the video)
  • Example preset time: ~7 seconds
  • Uses parameters such as:
    • PT (preset time)
    • Output Q

Combining TON with interlock

  • Demonstrates logic where:
    • Start/latch enables Timer1
    • Timer1 output triggers Timer2 after a delay
    • Timer2 may drive a later normally-closed logic path to “cut off” a stage
  • Example described:
    • Timer1 delay (~7s) → enables Timer2 delay (~10s) → then affects downstream logic

TOF (Timer OFF / “off-delay”)

  • Output turns ON immediately when input is ON
  • When input turns OFF:
    • Output remains ON until the preset off-delay (PT) elapses
  • Example preset time: ~7 seconds

TP / TONR-like accumulating / resume behavior

  • Teaches an accumulating concept:
    • If input turns OFF before preset time is reached:
      • accumulated time is preserved
    • When input turns ON again:
      • timing resumes from the saved value instead of starting over
  • Uses memory/internal elements to simulate stop/reset behavior (no physical reset button in the example)
  • Example preset time: ~10 seconds
  • Video emphasizes practicing:
    • TON, TOF, and the accumulating timer concept
    • Combining them with other logic elements

Main speakers / sources

  • Primary speaker: the YouTube channel creator (unidentified in subtitles; email/contact mentioned: Raffi Rivaldi)
  • Source referenced: Siemens documentation/UI concepts for S7-1200 and TIA Portal v15, plus implied references for:
    • Ladder Diagram (LD)
    • Set/Reset instructions
    • Timer block behavior

Original video