Siemens PLC Order Number Naming Rules 

1. Prefix: 6ES7

• 6ES: Identifies Siemens Automation Systems (core identifier for industrial control products).
• 7: Indicates the S7 PLC series (5 = legacy S5 series).

2. First 3 Digits (XXX): Series & Module Type

• 1st digit (3): PLC series
  • 2 = S7-200 / S7-200 SMART/S7-1200 
  • 3 = S7-300
  • 4 = S7-400
  • 5 = S7-1500
   
•  

• 2nd digit (2): Module category
  • 1 = CPU module
  • 2 = Digital I/O (DI/DO)
  • 3 = Analog I/O (AI/AO)
  • 4 = Communication module
  • 5 = Function/technology module
   
• 3rd digit (1): I/O direction (for I/O modules)
  • 1 = Input (DI/AI)
  • 2 = Output (DO/AO)
  • 3 = Combined I/O (DI+DO)
   

3. Middle Segment (XXXX): Performance & Specifications

• 1st digit (1): Performance level (higher = stronger functionality).
• 2nd letter (B): Signal type
  • B = Transistor (DC)
  • H = Relay
  • F = AC input
  • K = Universal analog
  • P = Temperature signal
   
• 3rd letter (H): Channel count
  • F = 8 points
  • H = 16 points
  • L = 32 points
  • D = 4 points
   
• Last 2 digits (01): Hardware version (incremental; minor versions are usually compatible).

4. Suffix (XXXX): Special Features & Packaging

• 0XA0: Standard packaging/accessory code (common suffix for standard modules).
• Other suffixes denote special functions (e.g., safety, extended temperature, or regional variants).

Example Interpretation

• 6ES7: S7 series PLC
• 3: S7-300 series
• 2: Digital I/O module
• 1: Digital input module
• 1BH01: Level 1, transistor input, 16 channels, version 01
• 0XA0: Standard packaging

• For S7200Smart Models, Can u understand these Number naming code?

• 6ES7288-1SR30-0AA1
• 6ES7288-1SR40-0AA1
• 6ES7288-1ST40-0AA1
• 6ES7288-2DE16-0AA0 
• 6ES7288-2DR08-0AA0
• 6ES7288-2DR16-0AA0
• 6ES7288-2DT08-0AA0 
• 6ES7288-2DT16-0AA0
• 6ES7288-2DT32-0AA0
• 6ES7288-2QR16-0AA0
• 6ES7288-3AM03-0AA0
• 6ES7288-3AM06-0AA0 
• 6ES7288-3AQ02-0AA0
• 6ES7288-3AR04-0AA0 
• 6ES7288-3AT04-0AA0
• 6ES7288-5CM01-0AA0
•