Allen-Bradley
DH+ RIO Bridge 1756-DHRIOK Allen Bradley Conformal
In stock, ready to ship
Manufacturer: Allen-Bradley
Product No.: 1756-DHRIOK
Product Type: Data Highway Plus / Remote I/O Module
Product Origin: USA
Payment: T/T
Weight: 1900g
Shipping port: Xiamen
Warranty: 12 months
Yes, we provide a 30-day money-back guarantee for all purchases.
Yes, all items come with a 12-month warranty from the date of shipment.
Product Overview
The Allen-Bradley 1756-DHRIOK is a conformal-coated communication module for ControlLogix systems. It provides two channels configurable for Data Highway Plus (DH+) or Remote I/O (RIO), enabling modern ControlLogix controllers to communicate with legacy PLC-5 and SLC 500 equipment.
Key Specs
- Channels: 2, independently configurable as DH+ or RIO
- DH+ baud rates: 57.6 Kbps, 115.2 Kbps, 230.4 Kbps
- RIO baud rates: 57.6 Kbps, 115.2 Kbps, 230.4 Kbps
- Connections: 32 message connections
- Current draw: 850 mA @ 5.1 V DC, 3 mA @ 24 V DC
- Power dissipation: 6.5 W
- Conformal coating: Yes, for corrosive environments
Why Choose This
- Conformal coating protects against moisture and corrosive atmospheres
- Dual channels support mixed DH+ and RIO network configurations
- Enables gradual migration from legacy PLC-5 systems to ControlLogix
- Message-based communication for data exchange with legacy controllers
Common Questions
- What is the difference between DHRIOK and DHRIO? The DHRIOK features conformal coating for harsh environments; the DHRIO is the standard version.
- Can it scan Remote I/O racks? Yes, each channel can be configured as an RIO scanner for 1771 remote I/O.
- Is there a replacement for this module? No, Rockwell has not introduced a successor; it remains the standard solution for DH+ and RIO connectivity.
Mounting Steps
- Install the module in any slot of the 1756 chassis.
- Connect the 3-pin Phoenix connector to the DH+ or RIO network.
- Configure each channel for DH+ or RIO operation in Studio 5000.
- Set baud rates and node addresses to match the legacy network.
- Verify communication with legacy devices via message instructions.
Buying Advice
- Select 1756-DHRIOK for corrosive environments requiring legacy DH+ or RIO connectivity.
- For extended temperature applications, choose the 1756-DHRIOXT.
- Plan for future migration: this module has no current replacement and is increasingly sourced through secondary markets.