continuous taskperiodic taskevent task31 , 32 or more tasktask can have 100 programsslc 500 , rslogix 500status gsv to look at it system variable ssv set system variablebinary bit int 256 elements ang max (16 bit)t4:0 timer , en , tt, en, base sec, pre, acc ,symbol descriptionatomic data type real, int , dint , bool , sint1756 controllogix modules do have processor so it is smart enough to do some diagnostic and rpiwhereas slc or rslogix 500 plc don't have so the compactbus need to check individual and update eachfirmware revision. 3.0 3 is the major revision and 0 is the minor revisionif exact keying major and minor revision of the module and compactbus must be the sameif compatible keying at least major is the sameif disable electronic keying neither is needed hence good for programming practice onlyrpi requested packet interval .2 to 750 ms (20 ms default)update process information to the processor io imageibi6d module with d ang last means diagnostic , smart moduleinput filter time acts as debounce timer if below set time it filters out (1ms default either on to off or off to on)backplane is the communication between the processor and the moduleprofessorplc.com youtube