PLC ST40 DC/DC/DC

Siemens 6ES7-288-1ST40-0AA0 is the CPU ST40 module of the SIMATIC S7-200 SMART PLC series. It is a compact and powerful CPU with onboard digital I/O, flexible communication, and robust performance for industrial automation.

Key Features:

• CPU type: ST40, DC/DC/DC power supply

• Onboard I/O:

  • 24 digital inputs (24 V DC)

  • 16 digital outputs (24 V DC, transistor type, 0.5 A per channel)

• Power supply: 20.4–28.8 V DC

• Program/data memory: 40 KB (16 KB user data, 24 KB program)

• Supports microSDHC memory card for program/data backup and transfer

• Communication interfaces:

  • 1 x Ethernet (RJ45, 10/100 Mbit/s, transformer isolated)

  • 1 x RS485 (up to 187.5 kbit/s)

• Processing times:

  • Bit operations: 150 ns

  • Word operations: 1.2 µs

  • Floating point arithmetic: 3.6 µs

• Real-time hardware clock (no battery backup), backup time approx. 7 days

• High-speed counters: 4 at 200 kHz (single phase) or 2 at 100 kHz (A/B phase)

• PID controller: up to 8 loops (automatic/manual mode)

• EMC compliance for industrial environments (EN 61000-6-4)

• Protection rating: IP20

• Operating temperature: 0°C to 55°C (horizontal installation)

• Dimensions: 125 mm (W) x 100 mm (H) x 81 mm (D)

• Weight: approx. 410 g

Typical Applications:

• Industrial automation and control

• Machine control and process automation

• Applications requiring onboard I/O and flexible communication