1769-CRR1 — Compact I/O Remote I/O Link Adapter (Remote End)

The 1769-CRR1 is the remote-end adapter module for the 1769 Compact I/O CRL link system. It pairs with a 1769-CRL1 master module installed in the controller's local I/O bus, connecting via a dedicated serial cable to bring a remote bank of 1769 I/O modules into the controller's I/O tree as if they were local. The CRR1 sits at the head of the remote I/O bank — I/O modules installed to its right on the same DIN rail become accessible to the controller through this link.

Specifications

Parameter	Value
Part Number	1769-CRR1
Platform	Compact I/O (1769)
Function	Remote I/O link adapter (remote end)
Pairs With	1769-CRL1 (master, installed at controller's local bus)
Max Remote I/O Modules	Up to 16 in the remote bank
Max Cable Length	30 m (CRL cable to master)
I/O Update	Synchronous with controller scan cycle
Field Power	24V DC (local supply at remote bank, not via CRL cable)
Backplane Current (5V)	60 mA
Operating Temperature	0°C to 60°C
Standards	UL 508, CE

What the Remote Adapter Does

The CRR1 receives the CRL communication signal from the master module and translates it into local backplane data for the I/O modules in its bank. From the controller's program, the remote modules appear as standard local I/O — same tag structure, same addressing conventions, no special instructions needed to read or write their data. The CRR1 handles the protocol translation transparently; the application program doesn't need to know the I/O is physically remote.

This architecture suits installations where a small I/O bank needs to sit away from the main controller — a junction box partway along a machine, a remote enclosure near a specific process area — without the cost or complexity of an EtherNet/IP network segment. The 30 m cable limit and 16-module capacity define the scope: beyond that distance or module count, an EtherNet/IP-based remote I/O architecture is the more appropriate choice.

Installation and Wiring

Use only the specified CRL cable between the CRR1 and the master 1769-CRL1 — standard Ethernet or generic serial cable is not electrically compatible with the CRL link's signaling.
The remote I/O bank requires its own 24V DC field power supply, local to the remote bank. The CRL cable carries only communication signals, not power for the I/O modules.
A 1769-ECR end cap is required at the rightmost module of the remote bank, the same as any standalone 1769 I/O system.
Ground the CRL cable shield at one end only to avoid a shield ground loop.
Configure the remote bank's modules in Studio 5000 under the corresponding 1769-CRL1 node — module types and slot order in the software must match the physical installation exactly.

FAQ

Q: Can the 1769-CRR1 be used without a matching 1769-CRL1 master?

No. The CRR1 only functions as the remote half of a CRL link pair. It requires a 1769-CRL1 installed in the controller's local I/O bus to establish the link.

Q: Does the remote I/O bank need a separate controller or processor?

No. The CRR1 is a communication adapter, not a controller. All program logic runs in the main controller at the master end — the remote bank simply extends that controller's I/O reach.

Q: What happens if the CRL cable is disconnected while the system is running?

The controller detects the loss of remote I/O communication and faults the affected I/O modules in the remote bank. Local I/O at the controller's main bus continues operating normally — only the remote bank's data becomes unavailable until the link is restored.

Q: Can analog modules be included in the remote I/O bank with the CRR1?

Yes. The remote bank can contain any mix of standard 1769 I/O modules — digital, analog, and specialty types — all updating at the same scan-synchronous rate through the CRL link.

1769-CRR1 New In Box 1769CRR1 Right To Right Cable Surplus