- Coordinates PLC-3 processor chassis in two-, three-, or four-chassis expansion layouts
- Match 1775-CX cables, the 1775-CXD panel, and 1775-CXT terminators to the installed topology
- Trace parity faults by checking chassis order and every expansion-bus channel connection
1775-LX is installed once in each PLC-3 processor chassis that participates in the documented expansion-bus arrangement.
Two-, three-, and four-chassis layouts use different combinations of 1775-CX cables, the 1775-CXD panel, and 1775-CXT terminators.
Chassis order and every channel connection must be restored exactly because a topology error can appear as an expansion-bus parity fault.
Availability, condition, price, and shipping time for 1775-LX are confirmed during quotation.
Allen-Bradley 1775-LX PLC-3 Expansion Module Manuals, Datasheets, Links
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.
- PLC-3 expansion can include as many as four processor chassis.
- One 1775-LX expansion module is installed in each processor chassis.
- The required panel and terminators depend on whether the system has two, three, or four chassis.
- 1775-CX cable sets connect the expansion modules and distribution panel.
- The 1775-CXD panel is used in three- and four-chassis systems.
- 1775-CXT terminators are documented for the three-chassis topology.
- The EBUS PARITY ERROR indicator reports a transmission parity fault between expansion modules.
- Cable seating, routing, panel ports, and terminators should be checked as one complete bus.
- Chassis placement and every channel connection must be restored from the recorded topology.
- Two-chassis PLC-3 systems using a direct documented expansion cable arrangement.
- Three-chassis PLC-3 systems using the distribution panel and required terminators.
- Four-chassis PLC-3 systems using the documented distribution-panel topology.