Features:
- Classic PLC-5/15 processor with Series B identification.
- 6K-word user memory supports expansion to 10K or 14K words.
- Provides one DH+ channel and one remote I/O channel.
The 1785-LT/B is the Series B form of the PLC-5/15 processor for a Classic PLC-5 control system.
It coordinates PLC-5 program execution with DH+ communications and remote I/O scanning or adapter operation, depending on system configuration.
Before replacement, verify the full processor label, memory arrangement, program backup, I/O rack map, and remote I/O role; do not assume another PLC-5 catalog number is interchangeable.
Availability is subject to Apter Power inventory and sourcing confirmation.
Verified resources for Allen-Bradley 1785-LT/B:
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Maintenance spare for an installed Classic PLC-5/15 Series B controller.
- Support for legacy DH+ and remote I/O installations tied to a 1785-LT/B program.
- Exact-model inventory during a phased PLC-5 migration.
- The Classic PLC-5/15 processor communicates through the Data Highway Plus and Remote I/O paths documented for the 1785-LT platform.
- Channel settings, station addresses, and network rates must agree with the existing PLC-5 project and connected adapters.
- Confirm cable topology and program-transfer access before exchanging a Series B processor in an operating chassis.
- Archive the current 1785-LT/B program and controller settings under the plant change procedure.
- Capture the chassis, communication cabling and associated memory module before removal.
- Use the documented Classic PLC-5/15 Series B installation procedure for the actual rack.
- Compare processor indicators and the recorded fault history before assuming that the 1785-LT/B itself has failed.
- If DH+ or remote I/O traffic changes, review network and adapter records alongside the processor.
- Keep the original module and its program backup available for a controlled rollback review.