SIMATIC S7-200 SMART, CPU ST20, Standard CPU Module, Transistor Output, 24 V DC Power Supply, 12 Inputs/8 Outputs
$175.85 – $195.38
CPU ST20, standard CPU — 12DI/8DO, smallest standard-line CPU, DC powered. [VERIFIED via Siemens official datasheet]
Technical Specifications
| Variant | ST20 DC/DC/DC |
| Digital I/O | 12 DI 24V DC / 8 DO 24V DC |
| Power Supply | DC 20.4–28.8V |
| Security Note | Per CISA advisory ICSA-24-165-02, S7-200 SMART CPU firmware versions affected by CVE-2024-35292 (predictable IP ID sequence number, CVSS up to 8.8) should be checked and updated where a network-facing deployment is planned. |
Typical Applications
Smallest standard-line CPU, expandable with EM modules and signal boards, suited for very small machines needing minimal I/O but with future expansion flexibility.






