Discrete I/O Control Solution — Allen-Bradley 1791-16BC | Block I/O Series
Where This Product Is Used
The Allen-Bradley 1791-16BC Block I/O Module is a field-proven discrete I/O solution deployed across a wide range of industrial automation environments. Engineers and system integrators specify this module in applications including:
- Automotive Assembly Lines — High-cycle discrete signal handling for robotic welding cells, conveyor interlocks, and end-of-line test stations.
- Food & Beverage Processing — Washdown-compatible installations monitoring fill-level sensors, gate valves, and packaging line status.
- Material Handling & Warehousing — Pallet conveyor routing, sorter divert logic, and AGV zone control.
- Water & Wastewater Treatment — Pump run/fault feedback, valve position monitoring, and alarm annunciation panels.
- Machine Tool & OEM Equipment — Distributed I/O at the machine level, reducing panel wiring and simplifying field commissioning.
- Oil & Gas Utilities — Remote I/O nodes in distributed control architectures where panel space is constrained.
Technical Specifications
| Attribute | Value |
|---|---|
| Part Number | 1791-16BC |
| Series | Allen-Bradley Block I/O |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| I/O Type | Discrete (Digital) |
| Total I/O Points | 16 |
| Communication Interface | Block I/O (compatible with 1771 PLC-5 and SLC systems) |
| Input Voltage | 24V DC (nominal) |
| Output Type | Transistor (NPN/Sourcing — confirm per revision) |
| Housing | IP65-rated compact block form factor |
| Weight | 780 g |
| Mounting | DIN rail or panel mount |
| Operating Temperature | 0°C to 60°C |
| SKU / Catalog No. | 1791-16BC |
Note: Always verify firmware revision and hardware series with your Rockwell Automation documentation before installation.
Why Engineers Specify This Model
- Distributed Architecture Advantage — Mounts directly at the machine or field device, eliminating long wire runs back to the main panel and reducing installation labor costs.
- Compact Block Form Factor — Integrates I/O, terminal blocks, and communication interface in a single sealed housing — ideal for space-constrained enclosures.
- Proven Rockwell Ecosystem Compatibility — Designed for seamless integration with Allen-Bradley PLC-5 and SLC 500 controllers via the 1771 I/O chassis or direct Block I/O network.
- Rugged IP65 Enclosure — Resists dust ingress and low-pressure water jets, suitable for harsh production floor environments.
- Simplified Commissioning — LED status indicators per I/O point enable rapid fault isolation without test equipment.
- Long-Term Parts Availability — Konmask.com maintains stock of legacy Allen-Bradley modules to support installed base maintenance and MRO procurement.
Complete System Bill of Materials
For a complete distributed I/O node using the 1791-16BC, engineers typically specify the following complementary components:
- 1771-ASB — Remote I/O Adapter for 1771 chassis (if used in remote rack configuration)
- 1791-A10 — Block I/O power supply / adapter module
- 1485C-P1-C10 — DeviceNet drop cable (if network topology applies)
- 1756-L7x ControlLogix or 1747-L5x SLC 500 — Host controller platforms
- 1492-CABLE series — Pre-wired I/O interface cables for rapid termination
- 1606-XLP — 24V DC power supply for field I/O bus
Contact support@konmask.com to request a complete BOM review for your application.
Compliance & Industry Standards
- UL Listed — Recognized under UL 508 (Industrial Control Equipment)
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive
- RoHS Compliant — Meets EU Directive 2011/65/EU on restriction of hazardous substances
- IP65 Rated — Per IEC 60529 for dust-tight and water-jet protection
- ATEX / Class I Div 2 — Verify specific revision for hazardous location suitability
Quality Assurance & Sourcing
Konmask.com sources Allen-Bradley modules through established industrial distribution channels. Every unit offered undergoes the following before dispatch:
- Visual inspection for physical damage, corrosion, and label integrity
- Verification of catalog number, series letter, and firmware revision against order specifications
- Functional power-on check where test equipment is available
- Anti-static packaging with humidity indicator card for transit protection
We supply both new-in-box (NIB) and tested surplus units. Condition is clearly stated on each listing. All surplus units carry a 90-day operational warranty.
How to Source This Part
- Add to Cart — Click the purchase button above to place an order directly online.
- Request a Quote — For volume orders (>5 units) or project BOM requirements, email support@konmask.com with your quantity and required delivery date.
- Expedited Sourcing — If this item shows as out of stock, contact us directly. We maintain supplier relationships that allow rapid procurement of legacy Allen-Bradley parts.
- Global Shipping — We ship worldwide via DHL, FedEx, and UPS. Export documentation (commercial invoice, packing list, COO) provided upon request.
- Phone / WhatsApp — Reach our technical sales team at +0086 19859288691 for urgent requirements.
Application-Specific FAQ
Q: Is the 1791-16BC compatible with ControlLogix or CompactLogix platforms?
A: The 1791-16BC is a legacy Block I/O module designed for PLC-5 and SLC 500 architectures. For ControlLogix/CompactLogix integration, a 1756-DHRIO or 1747-AENTR adapter may be required. Contact us for migration guidance.
Q: What is the difference between 1791-16BC and 1791-16AC?
A: The suffix denotes the output type — BC typically indicates 24V DC transistor outputs, while AC variants use AC output circuits. Always confirm with the Rockwell Automation product selector or our technical team before ordering.
Q: Can this module be used in a new system design?
A: While the 1791 Block I/O series is mature technology, it remains fully functional for MRO and installed-base expansion. For new designs, Rockwell recommends the 1734 POINT I/O or 1769 Compact I/O families. We can supply both.
Q: Do you provide a datasheet or wiring diagram?
A: Yes. Email support@konmask.com with your order number or inquiry reference and we will provide the relevant Rockwell Automation publication.
Q: What is the lead time for this part?
A: In-stock units ship within 1–2 business days. For sourced units, typical lead time is 5–10 business days depending on supplier availability.
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Contact: support@konmask.com | +0086 19859288691
