1785-L20B AB Allen-Bradley PLC Standard PLC-5 Processor 1785 Series Original brand new

1785-L20B AB PLC Standard PLC-5 Processor 1785 Series Original brand new

PLC-5 Processors
Standard PLC-5 Processors 

Total I/O, Max. is the actual I/O circuits, regardless of the number of connection points or I/O image bits. The number of I/O image bits (8, 16, or 32) that correspond to an I/O module limit the number of I/O at that module; however, some modules may have less I/O than I/O image bits. This includes local I/O, extended local I/O, and Universal Remote I/O combined. This does not include DeviceNet I/O.
Any mix means that any number of the I/O can be inputs and any number can be outputs, with no placement restrictions.
Complementary means that to configure this many I/O, pairs of modules must have duplicate addresses. This pair must be either 2 output modules sharing the same output image bits or an input module and an output module complementing each other. In either case, module placement must conform to these restrictions.I/O rack is an I/O addressing unit that can contain a max. of 128 I/O with unique addressing of I/O modules or 256 I/O with duplicate addressing of I/O modules.

Cat. No.	Processor	User Memory Words, Max.?	Memory Types	Total I/O, Max.	Analog I/O, Max.	I/O Scan Time per Rack?
Standard PLC-5 Processors
1785-L11B	PLC-5/11	8K	•Battery-backed static RAM •EEPROM program backup option using: 1785-ME16, -ME32, -ME64, and -M100	•512 (any mix) or •384 in + 384 out (complementary)	512	•10 ms at 57.6 kbit/s •7 ms at 115.2 kbit/s •3 ms at 230.4 kbit/s
1785-L20B	PLC-5/20	16 kB	•Battery-backed static RAM •EEPROM program backup option using: 1785-ME16, -ME32, -ME64, and -M100	•512 (any mix) or •512 in + 512 out (complementary)	512	•10 ms at 57.6 kbit/s •7 ms at 115.2 kbit/s •3 ms at 230.4 kbit/s
1785-L30B	PLC-5/30	32K	•Battery-backed static RAM •EEPROM program backup option using: 1785-ME16, -ME32, -ME64, and -M100	•1024 (any mix) or •1024 in and 1024 out (complementary)	1024	•10 ms at 57.6 kbit/s •7 ms at 115.2 kbit/s •3 ms at 230.4 kbit/s
1785-L40B	PLC-5/40	48 kB‡	•Battery-backed static RAM •EEPROM program backup option using: 1785-ME16, -ME32, -ME64, and -M100	•2048 (any mix) or •2048 in + 2048 out (complementary)	2048	•10 ms at 57.6 kbit/s •7 ms at 115.2 kbit/s •3 ms at 230.4 kbit/s