Allen-Bradley 1785-L40 PLC-5/40 Processor Module

FAQ

Q1. What is the 1785-L40 used for?
It is a high-performance PLC-5/40 processor used for controlling large and complex industrial automation systems.

Q2. Is it a CPU or communication module?
It is a CPU (processor module), responsible for executing control logic.

Q3. What memory capacity does it have?
It provides 48K words of battery-backed SRAM.

Q4. What communication interfaces are available?
Standard versions support DH+, Remote I/O, and serial communication, with variants offering Ethernet or ControlNet.

Q5. How many I/O points can it support?
Up to 2048 I/O points, depending on system configuration.

Q6. What chassis does it use?
It installs into a 1771 I/O chassis in PLC-5 systems.

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

Q8. Is it still in production?
No, it is a legacy/discontinued PLC-5 processor, commonly maintained in existing installations.

1785-L40 Allen Bradley

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