How is the PROFINET IO communication commonly used in S7-200SMART implemented?

Simplified Guide to PROFINET Bidirectional Communication with Siemens S7-200 SMART PLC

Objective:  

Enable two S7-200SMART PLCs to exchange data via PROFINET:  

-Controller sends VB0~VB9 → IO Device’s VB100~VB109.  

-IO Device sends VB10~VB19 → Controller’s VB200~VB209.  

Configuration Steps:  

1. IO Device Setup:  

   - Set role to PROFINET IO Device (IP: e.g., 192.168.0.2, name: e.g., Device2).  

   - Map input area IB1152 (10 bytes) to receive data from the Controller.  

   - Map output area QB1152 (10 bytes) to send data to the Controller.  

   - In program: Copy IB1152 to VB100~VB109 and VB10~VB19 to QB1152.  

2. Controller Setup:  

   - Set role to PROFINET Controller (IP: e.g., 192.168.0.1).  

   - Add the IO Device (Device2) to the network.  

   - Map output area QB128 (10 bytes) to send data to the IO Device.  

   - Map input area IB128 (10 bytes) to receive data from the IO Device.  

   - In program: Write VB0~VB9 to QB128 and read IB128 into VB200~VB209.  

Critical Notes:  

- Network: Both PLCs must share the same subnet (e.g., 192.168.0.x).  

- Matching: Device name and IP on both sides must match.  

- Data Flow:  

- Controller: Send via QB128, receive via IB128.  

- IO Device: Receive via IB1152, send via QB1152.