| Product Type | CPU |
| Product Model | 6ES7288-1ST40-0AA1 |
| Working Voltage | 24V DC |
| Product Dimensions | 125 MM × 100 MM × 81 MM |
| Power Supply Voltage |
Rated value (DC) 24 V
|
| Weight | 410.3 g |
Mainstream Transistor Output CPU for S7-200 SMART:Model ST40, a high-performance 24 V DC PNP transistor-output CPU in the SIMATIC S7-200 SMART series—designed for medium-scale automation systems requiring more I/O points and high-speed control, such as assembly lines, packaging machines, and spray systems.
Dual Communication Interfaces for Enhanced Connectivity:Equipped with 1 built-in RS485 port + 1 Signal Board (SB) slot (supports RS232/RS485 or I/O expansion).Supports MODBUS RTU (master/slave mode)—enables connection to HMIs, drives, and instruments.Can be expanded to PROFIBUS-DP slave via EM DP01 module—facilitating integration into industrial networks.
Flexible Expandability:Up to 7 signal modules (AI, AQ, DI, DO, RTD, TC) and 2 communication modules can be added—enabling scalable system design for diverse automation needs.
Built-in Real-Time Clock (RTC) with Battery Backup:Features an integrated RTC—supports time-stamping, scheduled operations, and data logging.Clock maintained via supercapacitor or memory card battery—ensures time continuity during power loss.
