Further information for Siemens 6ES7870-1AA01-0YA1 - MODBUS Master V3 Software documentation hardware dongle Kl A
SIMATIC S7, MODBUS Master V3.1 single license for 1 installation R-SW, without SW and without DOKU, HW dongle, class A, 3 languages (de, en, fr), executable with STEP 7 from V4.02, reference HW: CP 341 and CP 441-2 driver for Modbus protocol with RTU message format.