Backpan or backplane?

Subject: Backpan or backplane?
From: Chris Morton <salt -dot- morton -at- gmail -dot- com>
To: "techwr-l -at- lists -dot- techwr-l -dot- com" <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Sun, 22 Mar 2015 10:14:46 -0700

I'm working on a user manual for a SCADA-driven programmable logic
controller (PLC). The unit accepts add-on cards, much like a desktop
personal computer.

Referring to the contextual samples below, my question pertains to the use
of "backpan" vs. "backplane." I think it's the latter, and can find online
support for this. The engineer who designed this unit, and its
predecessors, thinks it's the former. I can find no definition for this,
nor online support.

- These terminal boards provide excellent lightning/surge protection and
alleviate the need to install discrete interposing devices to the enclosure
*backpan*.

- <Model number> Card Chassis
<Company name> 5 slot card chassis, including *backplane*: 1lb 3.5oz.
( 552g )
<Company name> 12 slot card chassis, including *backplane*:


What's your take?

Thanks
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