- Assign each channel explicitly as DH+ or Remote I/O before reconnecting the network
- Preserve routing tables, link IDs, node addresses, rack assignments and communication rates
- Review Series E firmware and electronic keying when replacing an earlier module
1756-DHRIO is an Allen-Bradley ControlLogix DH+ and Remote I/O communication module.
Its two channels can be configured independently; DH+ supports messaging, while Remote I/O operation is scanner-only for digital and block-transfer data.
Confirm firmware, routing, keying, cable polarity, network termination and controller project compatibility before restoring communications.
Availability, condition, price, and shipping time for 1756-DHRIO are confirmed during quotation.
Allen-Bradley 1756-DHRIO ControlLogix Communication Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Preserve local and remote link IDs and controller message paths
- Restore node addresses and channel communication rates
- Remember that Channel A and the programming port are not isolated from each other
- Configure 1756-DHRIO as a scanner, not as an adapter
- Restore logical rack, starting-group and block-transfer assignments
- Match Belden 9463 polarity, communication rate and network termination
- Do not downgrade Series E firmware 7.x to version 6.x
- Update EDS and controller-software support before installation
- Handle electronic keying and routing-table restoration according to the network role
- 1756-DHRIO Data Highway Plus messaging on either independently configured channel
- 1756-DHRIO Remote I/O scanner operation with up to 32 logical racks and 16 block transfers per channel
- Mixed service with one 1756-DHRIO channel assigned to DH+ and the other assigned to Remote I/O