Siemens 6ES7870-1AB01-0YA1 is a SIMATIC S7 MODBUS Slave V3.1 software license that covers a single installation (R-SW) for use with compatible S7 automation hardware. It is delivered as a hardware dongle with no bundled software or documentation, classified as Class A, and supports three languages (German, English, French); the runtime requires STEP 7 V4.02 or higher and targets reference hardware CP 341 and CP 441-2. The license enables MODBUS Slave communication on Siemens S7 controllers in industrial automation environments.
