How to match obsolete CompactLogix 1769 I/O
Allen-Bradley I/O is a catalog number plus a series letter. A 1769-IQ16 series A is not automatically a series B. Photograph the card face, the side catalog sticker, and the slot it sits in. We search remaining U.S. stock for that exact string.
Request a quoteHow to read a CompactLogix card
- 1
Copy catalog number and series
1769-IQ16, 1769-OB16, 1769-IF4, 1769-L32E, 1756-IB16, and so on — including SERIES A/B/C printed on the label. Firmware revision on the processor matters for CPU spares.
- 2
Photograph the chassis and neighboring modules
Pointbus / CompactBus length, end cap, and which slot is empty tell us whether a successor module will even seat.
- 3
Note the processor family
CompactLogix 1769, CompactLogix 5370, and ControlLogix 1756 are different chassis. Do not mix 1769 cards into 1756 racks.
- 4
Say if used / surplus is acceptable
Many 1769 numbers are discontinued as new. We quote unused surplus or pull-out stock when new is gone, and we label condition on the quote.
Exact module vs “same I/O count”
A 16-point card from another series can have a different connector, filter time, or isolation. The controller expects the catalog number in the tree. We quote the number on the sticker, not a generic 16-point input.
Processors and firmware
Replacing a 1769-L32E or similar CPU requires matching or compatible firmware and keying. Send a photo of the processor LCD or a Controller Properties screenshot if you have it.
CompactLogix 1769 FAQ
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Have a part number for an encoder, motor, drive, or obsolete board? Contact us for a sourcing quote.