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