1, (Rockwell) (Rockwell Automation), also known as the American :( AB) (Allen-Bradley) is the largest amount of automation products; 2, (ABPLC) most commonly used model series SLC500 series 1746-1747-1756- amount The most widely quantities Special Here are some models: AB 1746-NI16V 1 analog input / output modules PLC AB 1746-HSCE 1 Peripheral PLC AB 1746-NI16V 1 analog input / output modules PLC AB 1756-CNBR 1 communication module PLC AB 1756-CP3 1 functional unit name PLC AB 1756-OW16I 3 digital input / output modules PLC AB 100 - C16DJ01 16A 24V 3 contacts SOFT AB 1746-NIO4I 1 analog input / output modules PLC AB 1746-OB32 1 digital input / output modules PLC AB 1746-NIO4I 1 analog input / output modules PLC AB 1746-N2 1 PLC Accessories PLC AB 1747-BA 2 PLC Accessories PLC AB 1746-C9 1 PLC Accessories PLC AB 1746-NI4 1 Analog Input / output modules PLC AB 1746-NR8 1 digital input / output modules PLC AB 1746-NI8 1 analog input / output modules PLC AB 1746-NI8 13 analog input / output modules PLC AB 1746-P1 9 PLC Accessories PLC AB 1747-SN 2 memory cartridge PLC AB 1762-L40BWA 1 integrated PLC PLC AB 1746-NO8I 5 analog input / output modules PLC AB 1746-OA16 1 digital input / output modules PLC AB 1746-A13 4 PLC backplane PLC AB 1746 -N2 10 PLC AB 1746-NI4 2 Analog Input Module PLC AB 1746-NO4I 6 analog output module PLC AB 1746-OB16 15 digital output module PLC AB 1746-OB32 10 digital output module PLC AB 1747-L542 2 available Programming Terminal PLC AB 1756-BA1 10 PLC AB 1756-CNBR 2 Communication module PLC AB 1756-ENBT 3 Communication module PLC AB 1756-TBCH 15 PLC AB 1746-A7 5 PLC backplane PLC AB 1746-A10 4 PLC backplane PLC AB 1746- A13 8 PLC backplane PLC AB 1746-A7 3 PLC backplane PLC AB 1746-IB16 15 digital input module PLC AB 1746-IB32 5 digital input modules PLC AB 1746-IM16 15 digital input module PLC AB 1746-N2 10 PLC AB 1746-NO4I 1 analog output modules PLC AB 1746-OB16 14 digital output module PLC AB 1746-OB32 10 digital output module PLC AB 1746-OW16 15 digital output module PLC AB 1746-P4 5 power unit PLC