When a Process Manager (PM) or Advanced Process Manager (APM) has
more than one card file, the card files communicate through redundant serial
I/O Link Interface cables. The 51195479-200 has three drop connectors.

I/O Link Interface cables must not be longer than 10 meters (33 feet) in total
length and must not leave the Process Manager or Advanced Process
Manager cabinet or cabinet complex. Two cables are required because the
I/O Link Interface provides redundancy for reliability. One cable is
designated Link A and the other Link B.

Two types of I/O Link Interface cables are available. Both types of cable
are shielded, but they differ in how the cable shield is connected to ground.
Both types consist of a pair of cables to support I/O Link Interface
redundancy when ordered by the appropriate part number.

The number of connectors required depends upon the number of card files
that are interconnected. When there are more than two card files in a subsystem,
a pair of tab 200 (-200) through 500 (-500) cables is used to daisy-chain all the
Link A and Link B connections together. Both cables should be laced together
to create one harness.

The I/O Link Interface cables with a part number of 51195479-xxx are not
used for a CE Compliance application. They have no shield wires. The
cable shield is grounded through the cable connector in the card file
backpanel.

The I/O Link Interface cables with a part number of 51204042-xxx are CE
Compliant. The CE Compliant card file models have shield FASTON terminals
for the cables on the backpanel ground panel.