SIEMENS 6ES7315-2AH14-0AB0 PLC CPU Module

SIEMENS 6ES7315-2AH14-0AB0 PLC CPU Module (S7-300 CPU 315-2DP)

 

 

The SIEMENS 6ES7315-2AH14-0AB0 is a SIMATIC S7-300 CPU 315-2DP central processing unit, used as the main PLC controller in Siemens S7-300 automation systems.

Product Information

• Brand: Siemens
• Series: SIMATIC S7-300
• Model: 6ES7315-2AH14-0AB0
• Type: PLC CPU (Central Processing Unit)
• CPU type: 315-2DP
• Work memory: 256 KB
• Communication interfaces:
  • MPI interface (programming/diagnostics)
  • PROFIBUS DP (master/slave)
• Power supply: Integrated 24 V DC
• Memory card: Micro Memory Card required
• Mounting: S7-300 rack system (central slot CPU position)

What it actually is

This is the main brain of an S7-300 PLC system.

It:

• Executes PLC logic programs (ladder / STL / FBD)
• Controls all I/O modules in the rack
• Communicates with remote I/O (ET200, Profibus devices)
• Manages timers, counters, and process control tasks

System Role (Simple)

Sensors / field devices
→ ET200 / S7-300 I/O modules
→ CPU 315-2DP (this module)
→ PLC program execution
→ outputs control signals to machines

Key Features

• Medium-to-high performance S7-300 CPU
• Integrated PROFIBUS DP communication
• Supports distributed I/O systems
• 256 KB program memory (typical mid-range PLC)
• Real-time deterministic control
• Widely used in factory automation systems

Typical Applications

• Production line automation
• Conveyor and packaging systems
• Process control systems
• Machine control (OEM equipment)
• Distributed I/O control systems

Advantages

• Reliable Siemens industrial PLC platform
• Strong Profibus DP networking capability
• Supports large distributed automation systems
• Easy integration with ET200 remote I/O
• Stable long-term operation in harsh environments

Important Notes

• This IS a PLC CPU ✔
• Not an I/O module ❌
• Not a communication module ❌
• Not a drive or power device ❌
• It requires S7-300 rack + I/O modules to operate

Precautions

• Requires Micro Memory Card to run program
• Must match correct hardware configuration in STEP 7
• Incorrect Profibus setup can cause system STOP state
• CPU firmware version must match engineering project
• End-of-life product (still widely used in industry)