1769-CRR3 — Compact I/O Right-to-Right Bus Expansion Cable, 1 m

The 1769-CRR3 is a 1-meter right-to-right bus expansion cable for the 1769 Compact I/O platform, used to extend the communication bus between two separate I/O banks when a single bank's physical layout doesn't fit the application or panel. It connects the right end of one I/O bank to the right end of another, carrying bus signaling between them without extending bus power — each bank still needs its own dedicated power supply.

Specifications

Parameter	Value
Part Number	1769-CRR3
Connection Type	Right bank to right bank
Cable Length	1 m (3.28 ft)
Operating Temperature	0°C to 60°C
Humidity	Up to 95% non-condensing
Max Altitude	2000 m

Extending the Bus to a Second I/O Bank

A 1769 controller's right-side bus has a physical limit on how many modules can attach in a single contiguous run before backplane communication and power distribution stop working reliably. When a system needs more I/O than one bank reasonably supports — or when the panel layout calls for splitting modules across two physically separate locations — the CRR3 bridges the gap. Connecting right-end to right-end is a specific topology requirement: this cable type pairs with a matching configuration on the controller side, and mixing it up with a right-to-left or left-to-left cable will not produce a working connection.

Because the cable extends communication only, the second I/O bank requires its own power supply sized for the modules installed in that bank — the CRR3 doesn't carry backplane power across the gap between banks, only the bus signaling that keeps both banks addressable from the same controller program.

FAQ

Q: Does this cable extend backplane power to the second I/O bank?

No. It only extends the communication bus. Each I/O bank connected via this cable requires its own independent power supply.

Q: How many of these cables can be used in one system?

Most 1769 controllers support up to two expansion cables, allowing for up to three I/O banks total — though some controller models support fewer banks, so this should be verified against the specific controller in use.

Q: Can power be applied while connecting or disconnecting this cable?

No. Connecting or disconnecting a bus expansion cable under power can produce an electrical arc and should always be done with power removed from both I/O banks.

Q: Is this cable interchangeable with a left-to-left or right-to-left version?

No. The connector orientation is specific to right-to-right connections — using the wrong cable type for the required topology will not establish communication between the banks.

1769-CRR3 New Sealed 1769CRR3 Ser A Compact I/O Cable