SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24-48 V AC/DC with single rooting, 1x 40-pole.
6ES7321-1CH00-0AA0 – SIMATIC S7-300 SM 321, Digital input, 16 DI, 24-48 V AC/DC
SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24-48 V AC/DC with single rooting, 1x 40-pole