Allen Bradley 1785-L20B/E PLC-5/20 Processor Module

FAQ

Q1: What is the 1785-L20B/E?
A: It is an Allen-Bradley PLC-5/20 processor module, Series E.

Q2: How much user memory does it have?
A: It provides 16K words of user memory using battery-backed SRAM.

Q3: What communication ports are available?
A: It has one fixed DH+ port, one DH+/Remote I/O port, and one configurable serial port supporting RS-232-C, RS-422-A, or RS-423-A.

Q4: What is the maximum I/O capacity?
A: Up to 512 I/O points in a standard configuration, or 512 inputs plus 512 outputs in complementary mode.

Q5: Can it be used with Remote I/O?
A: Yes. The second DH+ channel can operate as a Remote I/O scanner or adapter.

Q6: What chassis is it installed in?
A: It is a single-slot processor installed in the left-most slot of a 1771 I/O chassis.

Q7: Is the 1785-L20B/E still manufactured?
A: No. The Series E model is discontinued and is generally available through surplus, used, or refurbished channels.

Q8: Is 1785-L20B/E the same as 1785-L20E?
A: No. 1785-L20B/E is a standard PLC-5/20 with DH+ and Remote I/O communication, while 1785-L20E is an Ethernet PLC-5/20 variant.

1785-L20B/E Allen Bradley

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