ZZC
Siemens S7 Series PLC
s7-200 SMART
The CIS represents the CPU type
C is economical, and s is standard i quasi DIA represents extended module type
D is the digital expansion module, A is the analog expansion module EIQ indicates the input l output
RIT represents digital quantity expansion module relay output / transistor output M represents analog quantity input l output extension module
The AR represents the thermal resistance extension module
XX indicates the number of input l-outbound ports
OA: continue to have
AO: version number
