Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 29)

Chapter
Installing the BASIC Module 1
1 -5
Set CPU Speed Select Jumper (JW3)
Use JW3 to select the operating speed of your BASIC module processor.
Unless you are using a memory module that is slower than 90 ns, set this
jumper to turbo to obtain optimum performance. Memory modules that
are slower than 90 ns are too slow to run in turbo; you must set the jumper
to normal. Refer to Chapter 3 for more information on memory modules.
For this CPU speed: Set jumper: ✔ your selection:
normal
(operating speed of Series A)
factory
setting
turbo
(operating speed approx.
4 times speed of Series A)
Chapter