Allen-Bradley 1775-S5 Communication Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley (AB) 1775-S5 is a dedicated communication module designed for use within the PLC-5 family of programmable logic controllers. It provides reliable data highway (DH+) and remote I/O communication capabilities for industrial automation systems. This page serves as a comprehensive selection and sourcing reference for engineers, maintenance teams, and procurement specialists evaluating the 1775-S5 or its compatible alternatives.
Technical Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Part Number: 1775-S5
- Module Type: Communication Module
- Compatible Platform: PLC-5 Processor Family
- Communication Protocol: Data Highway Plus (DH+), Remote I/O (RIO)
- Backplane Interface: PLC-5 series backplane
- Power Supply: Supplied via backplane
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C (-40°F to 185°F)
- Humidity: 5% to 95% non-condensing
- Weight: Approx. 2,300 g
- Certifications: UL, CE (verify with current datasheet)
Compatible Replacement & Equivalent Models
When the 1775-S5 is unavailable or end-of-life, the following models may serve as functional equivalents or drop-in replacements depending on your system configuration. Always verify firmware and backplane compatibility before substitution.
- 1775-S4B — Earlier revision of the S5; compatible in most PLC-5 chassis with DH+ networks
- 1785-L40B / 1785-L80B — PLC-5 processors with integrated DH+ ports; may eliminate the need for a separate communication module
- 1756-DHRIO (ControlLogix) — Migration path for systems upgrading to ControlLogix; supports DH+ and RIO bridging
- 1756-DNB — DeviceNet bridge module for ControlLogix; applicable if migrating protocol
- PROSOFT MVI56-DFCM — Third-party DH+ communication module for ControlLogix chassis
Note: Third-party and cross-generation replacements require engineering validation. Contact Konmask for sourcing and compatibility consultation.
Why Choose the Original Model
- Proven Reliability: The 1775-S5 has a long field history in heavy industrial environments including automotive, oil & gas, and utilities.
- Native DH+ Support: Designed specifically for Allen-Bradley DH+ protocol — no gateway or translation layer required.
- Seamless PLC-5 Integration: Plug-and-play compatibility with existing PLC-5 chassis and I/O configurations.
- Reduced Engineering Risk: Using the original part eliminates firmware mismatch and configuration overhead associated with third-party alternatives.
- Spare Parts Availability: Konmask maintains sourced inventory of legacy AB modules to support long-lifecycle industrial systems.
Typical Applications
- Factory automation and discrete manufacturing lines
- Automotive assembly plant control systems
- Water and wastewater treatment facilities
- Oil & gas upstream and midstream SCADA systems
- Power generation and utilities infrastructure
- Legacy system maintenance and brownfield upgrades
System Compatibility
The 1775-S5 is compatible with the following Allen-Bradley PLC-5 processor series:
- 1785-L20B, L30B, L40B, L60B, L80B (PLC-5/20, /30, /40, /60, /80)
- 1785-L20E, L40E (Ethernet-enhanced PLC-5 processors)
- 1771 I/O chassis (as remote I/O adapter)
- DH+ networks operating at 57.6 Kbps, 115.2 Kbps, or 230.4 Kbps
Not compatible with ControlLogix (1756), CompactLogix (1769), or MicroLogix platforms without a gateway bridge.
Selection Guide
Use the following criteria to determine whether the 1775-S5 is the right module for your application:
- Existing PLC-5 chassis? → 1775-S5 is the native choice.
- Need DH+ network communication only? → 1775-S5 or 1775-S4B.
- Migrating to ControlLogix? → Consider 1756-DHRIO for DH+ bridging.
- Upgrading to EtherNet/IP? → Evaluate 1756-ENBT or 1756-EN2T modules.
- Budget-constrained legacy maintenance? → Refurbished 1775-S5 from certified sources (e.g., Konmask) is cost-effective.
- Long-term support required? → Plan migration to ControlLogix platform; source 1775-S5 as interim spare.
Quality Assurance & Sourcing
All Allen-Bradley modules sourced through Konmask.com undergo the following quality process:
- Visual and physical inspection upon receipt
- Functional verification where test equipment is available
- Original manufacturer labeling and firmware version documentation
- Anti-static packaging and climate-controlled storage
- Traceability records maintained for B2B procurement compliance
We source from authorized distributors, OEM surplus channels, and verified industrial resellers. Counterfeit-risk screening is applied to all Allen-Bradley legacy parts.
How to Order
- Step 1: Confirm your PLC-5 chassis model and current firmware revision.
- Step 2: Verify DH+ network baud rate and node address requirements.
- Step 3: Contact Konmask via email or phone with your part number (1775-S5) and required quantity.
- Step 4: Receive quotation with lead time, condition (new/refurbished), and warranty terms.
- Step 5: Confirm purchase order — we support T/T, L/C, and trade assurance payment terms.
📧 support@konmask.com | 📞 +0086 19859288691
Replacement & Compatibility FAQ
Q: Can the 1775-S5 be used in a 1771 I/O chassis?
A: The 1775-S5 is a PLC-5 backplane module, not a 1771 I/O adapter. It must be installed in a PLC-5 processor chassis.
Q: Is the 1775-S5 still in production?
A: This module is considered legacy/end-of-life by Rockwell Automation. Konmask sources surplus and refurbished units to support ongoing maintenance needs.
Q: Can I replace the 1775-S5 with a 1756-DHRIO in my existing PLC-5 system?
A: No — the 1756-DHRIO is a ControlLogix module and requires a ControlLogix chassis. It can bridge DH+ networks but cannot be installed in a PLC-5 chassis.
Q: What warranty does Konmask offer on the 1775-S5?
A: Standard warranty is 90 days from shipment. Extended warranty options are available — contact us for details.
Q: Do you provide a certificate of conformance (CoC)?
A: Yes. CoC and inspection reports are available upon request for B2B and OEM customers.
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Contact: support@konmask.com | +0086 19859288691
