6 • MultiFlex I/O Board Operator’s Guide 026-1704 Rev 6 06-APR-10
2.2. The Plug-In Output Board
All MultiFlex boards except the MultiFlex
16 have output sub-boards that plug in to the top
of the base board. These boards are shipped with
the output board pre-installed on the board using
stand-offs, so no additional hardware setup
should be necessary.
The additional board makes the MultiFlex
combination I/O boards considerably taller than
the MultiFlex 16 and all previous-generation
CPC I/O boards. If you will be mounting these
boards in an enclosure, the board will need at
least 2.5" of clearance between the base board
and the panel door.
2.3. Powering the MultiFlex
All models of MultiFlex require a 24VAC
Class 2 input power source. The MultiFlex 16
requires the power source to be center-tapped.
All other models do not use the center tap.
CPC supplies a wide variety of 24VAC trans-
formers with varying sizes and either with or
without center taps. Table 2-1 shows the trans-
former sizes and whether they are center-tapped
or non-center-tapped.
Figure 2-3 - Exploded View -- MultiFlex Combination I/O Board
Xformer P/N VA Rating Primary Voltage Center Tap?
640-0041 50 VA 110 VAC No
640-0042 50 VA 220 VAC No
640-0056 56 VA Multi-tap (120/208/240 VAC) Yes
640-0050 75 VA 110 VAC No
640-0045 75 VA 220 VAC No
640-0080 80 VA Multi-tap (120/208/240 VAC) Yes
Table 2-1 - Transformers Compatible with MultiFlex Board
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