Allen-Bradley 1785-L11B/E PLC-5/11 Processor Module

FAQ

Q1. What is the 1785-L11B/E used for?
It is a PLC-5/11 processor used to control industrial automation systems such as machines, production lines, and process control systems.

Q2. What does the “/E” mean?
The “/E” indicates a Series E hardware revision, meaning a later updated version with minor hardware/firmware improvements.

Q3. Is it a communication module?
No, it is a CPU (processor module), not a communication interface.

Q4. What memory does it have?
It has 8K words of battery-backed SRAM for program storage.

Q5. What chassis does it use?
It is installed in a 1771 I/O chassis used by the PLC-5 system.

Q6. What software is used to program it?
It is programmed using RSLogix 5 or legacy PLC-5 programming tools.

Q7. Does it require a battery?
Yes, a lithium battery is used to retain memory when power is off.

Q8. Is it still in production?
No, it is a legacy/discontinued PLC-5 processor, mainly used for maintaining existing systems.

1785-L11B/E Allen Bradley

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