GE 90-30 PLC Series Installation And Hardware Manual page 262

standard cable, a custom cable must be built (see the section "Building Custom Length I/O Bus
Expansion Cables" for detailed instructions).
Connecting the Cables
Important Notes About I/O Bus Expansion Cables
1.
2.
3.
Cable Application Suggestions
In general, it is advantageous to use standard, factory-built cables, where possible, to save time and
avoid wiring errors.
Using Standard Cables
GFK-0356Q Chapter 10 Cables
Connect the single male connector to the 25-pin female connector on the right side of the CPU
baseplate.
Connect the male connector on the dual connector end of the cable to the 25-pin female
connector on the first expansion baseplate.
Connect the unused 25-pin female connector on the dual connector end of the cable to either
the single male connector of a second I/O bus expansion cable to continue the I/O bus
expansion chain, or to an I/O bus Terminator plug if this is the last cable in the expansion
chain.
The maximum number of cables that can be included in an I/O expansion system is seven, and
the total maximum cable length between the CPU baseplate and the last expansion baseplate is
50 feet (15 meters). The total maximum cable length between the CPU baseplate and the last
remote baseplate is 700 feet (213 meters). Failure to observe these maximum cable lengths
could result in erratic operation of the PLC system.
CPUs 350 - 374 support a maximum of seven I/O expansion cables. CPUs 331 - 341 support a
maximum of four I/O expansion cables.
The 50 foot (15 meter) I/O bus expansion cable (IC693CBL302), which has a male connector
on each end, has the I/O bus terminating resistors built into the end connector on the cable. If
this cable is used, you would not install a separate terminator block.
I/O Bus Expansion cables should NOT be connected or disconnected with
power applied to the I/O expansion baseplate(s). Unexpected PLC operation
may result.
For connecting between baseplates (either between a CPU and expansion baseplate, between
two expansion baseplates or between two remote baseplates) in the same cabinet when a
standard length (0.5, 1, 2, 8, or 15 meters) will fit the need.
As a Wye jumper for custom built point-to-point cables (IC693CBL300 is often used for this).
This combination saves time since a point-to-point cable can be built much faster than a Wye
cable. An example of this is shown in Figure 10-23.
Caution
10
Cables
10-23