Discrete I/O Module Connection Methods; Connections To I/O Module Terminal Boards - GE 90-30 PLC Series Installation And Hardware Manual

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Where AC or Output wiring bundles must pass near noise-sensitive signal wiring bundles, avoid
running them beside each other. Route them so that, if they have to cross, they do so at a right
angle. This will minimize coupling between them.
Grouping Modules to Keep Wires Segregated
If practical, grouping similar modules together in the PLC racks can help keep wiring segregated.
For example, one rack could contain only AC modules, and a different rack only DC modules, with
further grouping in each rack by input and output types. For smaller systems, as an example, the
left end of a rack could contain Analog modules, the middle could contain DC modules, and the
right end could contain AC modules.

Discrete I/O Module Connection Methods

Connections to I/O Module Terminal Boards

Series 90-30 PLC I/O terminal boards have either 10 or 20 screw terminals that will accept from
two AWG #22 (0.36 mm
(194°F) wire(s). Each terminal can accept solid or stranded wires, but the wires into any given
terminal should be the same type (both solid or both stranded) to ensure a good connection. Wires
are routed to and from the terminals out of the bottom of the terminal board cavity. The suggested
torque for the I/O terminal board connection screws is from 9.6 in-lbs to 11.5 in-lbs (1.1–1.3
Newton-meters).
2-18 Series 90-30 PLC Installation and Hardware Manual – August 2002
For modules with 16 points or less, the standard method is to use the removable terminal board
which comes with these modules. The removable terminal board makes it easy to prewire
field wiring to the user supplied input and output devices, and to replace modules in the field
without disturbing existing field wiring.
Some discrete 16-point I/O modules can be used with an optional Terminal Block Quick
Connect (TBQC) assembly. This assembly contains a module faceplate, with built-in
connector, that replaces the removable terminal board. The assembly also contains a DIN-rail
mounted terminal block and a cable to connect the module to the terminal block. The
advantage of this method is that it saves about two hours of wiring time per module compared
with hand wiring from a module's removable terminal board to a user-supplied, panel-mounted
terminal block or strip.
Older 32-point I/O modules have one 50-pin connector on the front of the module that is either
connected by a cable with a connector on each end to a Weidmuller panel-mounted terminal
block (Weidmuller catalog no. 912263), or is connected by a cable with stripped, tinned leads
to a user-supplied terminal block or strip.
Newer 32-point I/O modules have two 24-pin connectors on the front of the module. These
module may be wired in one of three ways. (1) Use a pair of cables (IC693CBL327/328 - see
data sheet in "Cables" chapter) to connect the module to a user-supplied, panel-mounted
terminal block or strip. These cables have a 24-pin connector on one end, and stripped, tinned
leads with wire markers on the other end. (2) Use a pair of dual-connector cables to connect
the module to a Terminal Block Quick Connect (TBQC) terminal block (IC693ACC377). See
Appendix H for details. (3) Make your own custom cables. Instructions are found in the
IC693CBL327/328 data sheet in Chapter 10.
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) to two AWG #16 (1.3 mm
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), or one AWG #14 (2.1 mm
2
) copper 90°C
GFK-0356Q