... 1EH00-0AA0 SM 321, 16*AC 120V, optically isolated 6ES7321-1EH01-0AA0 SIMATIC S7-300, DIGITAL INPUT ... 1FF00-0AA0 SM 321, 8*AC120/230V, optically isolated 6ES7321-1FF01-0AA0 SIMATIC S7-300, DIGITAL INPUT ... 1FF81-0AA0 SM 321, 8*AC120/230V, optically isolated 6ES7321-1FH00-0AA0 SIMATIC S7-300, DIGITAL INPUT ... SM 322, 8*DC 24V, 2A, optically isolated 6ES7322-1BF01-0AA0 SIMATIC S7-300, DIGITAL OUTPUT 6ES7322 ...