Digital modules 
  3.16 Digital input module SM 321; DI 8 x 120/230 VAC ISOL (6ES7321-1FF10-0AA0) 
S7-300 Automation System Module data 
Manual,  08/2006, A5E00105505-04 
3-45 
3.16  3.16 Digital input module SM 321; DI 8 x 120/230 VAC ISOL 
(6ES7321-1FF10-0AA0) 
Order number 
6ES7321-1FF10-0AA0 
Properties 
Properties of the digital input module SM 321; DI 8 x AC 120/230 V ISOL: 
●  8 inputs, electrically isolated in groups of 1 
●  120/230 VAC rated input voltage 
●  Suitable for switches and 2-/3-/4-wire AC proximity switches 
Wiring and block diagrams of SM 321; DI 8 x 120/230 VAC ISOL 
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①  Channel number 
②  Status display - green 
③  Backplane bus interface