Allen-Bradley DIM16 SLC 16-Point 240V AC Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley DIM16 is a 16-point, 240V AC discrete input module designed for use in the SLC 500 programmable controller family. It provides reliable interface between field-level AC devices and the SLC 500 processor, making it a cornerstone component in legacy industrial automation systems worldwide. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement specialists.
Technical Specifications
- Part Number: DIM16
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Series: SLC 500
- Module Type: Discrete Input
- Number of Input Points: 16
- Input Voltage: 240V AC (nominal)
- Input Voltage Range: 195–265V AC
- Input Frequency: 47–63 Hz
- Input Current (per point): Approx. 8–10 mA at 240V AC
- ON-State Voltage: 159V AC minimum
- OFF-State Voltage: 40V AC maximum
- Isolation: Optical isolation between field and backplane
- Backplane Current Draw: Approx. 75 mA at 5V DC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Weight: Approx. 450 g
- Compatibility: SLC 500 fixed and modular chassis (1746 series)
- Status Indicators: LED per input point
Compatible Replacement & Equivalent Models
When the DIM16 is discontinued, obsolete, or unavailable, the following Allen-Bradley and third-party equivalents are commonly evaluated:
- 1746-IA16 — Allen-Bradley SLC 500 16-point 120/240V AC input module (direct functional equivalent, most recommended replacement)
- 1746-IA8 — 8-point 120/240V AC input (use two modules to match 16-point capacity)
- 1746-IM16 — 16-point 120V AC input (verify voltage compatibility before substitution)
- 1746-IV16 — 16-point 10–30V DC input (requires field wiring modification)
- Third-party SLC 500-compatible I/O modules — Various manufacturers offer drop-in compatible modules; verify backplane protocol and current draw before installation
Note: Always verify firmware revision, backplane slot compatibility, and field wiring specifications before substituting any module.
Why Choose the Original DIM16 Model
- Proven reliability in legacy SLC 500 installations with decades of field history
- Native SLC 500 backplane communication — no configuration adapters required
- Optical isolation protects the processor from field-side voltage transients
- Per-point LED diagnostics enable rapid fault identification without additional test equipment
- Direct drop-in replacement for existing DIM16 slots — no chassis modification needed
- Sourced from verified supply chains — Konmask.com provides traceability documentation on request
Typical Applications
- Reading status from 240V AC pushbuttons, limit switches, and selector switches
- Monitoring 240V AC motor starters and contactor auxiliary contacts
- Interfacing with 240V AC proximity sensors and photoelectric sensors
- Process control panels in food & beverage, water treatment, and manufacturing
- Legacy machine retrofits and MRO (Maintenance, Repair & Operations) replacements
- Panel upgrades where existing 240V AC field wiring must be preserved
System Compatibility
- Compatible Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13 (SLC 500 modular chassis)
- Compatible Processors: SLC 5/01, 5/02, 5/03, 5/04, 5/05
- Programming Software: RSLogix 500, RSLogix Micro
- Communication: Backplane data highway via SLC 500 I/O bus
- Not compatible with: ControlLogix (1756), CompactLogix (1769), or MicroLogix platforms without an adapter
Selection Guide
Use the following criteria to confirm the DIM16 is the correct module for your application, or to select an appropriate alternative:
- Field voltage: Confirm field devices operate at 240V AC. If 120V AC, consider 1746-IA16 or 1746-IM16.
- Point count: 16 inputs required? DIM16 or 1746-IA16. Need 8? Use 1746-IA8.
- Chassis slot availability: Verify available slots in your 1746 chassis before ordering.
- Backplane current budget: Sum all module current draws; ensure chassis power supply (1746-P series) is not overloaded.
- Signal type: AC discrete only. For DC inputs, select 1746-IB or 1746-IV series.
- Environment: Standard industrial environment (0–60°C). For harsh environments, consider conformal-coated variants.
Quality Assurance & Sourcing
- All modules sourced through authorized distributors and verified secondary market channels
- Pre-shipment inspection includes visual check, label verification, and functional test where applicable
- Traceability documentation (COC, test reports) available upon request
- Packaging: anti-static bag + foam-lined carton for safe international shipping
- Warranty: 90-day replacement warranty against DOA (Dead on Arrival) defects
- Export compliance: HTS classification available; ECCN review on request
How to Order
- Step 1: Confirm part number: DIM16 (or specify revision if known)
- Step 2: Indicate quantity and required delivery timeline
- Step 3: Submit RFQ via support@konmask.com or add to cart directly
- Step 4: Receive quotation with lead time, pricing, and sourcing documentation within 1 business day
- Step 5: Confirm order and receive tracking information upon shipment
For urgent MRO requirements or large-volume procurement, contact us directly at +0086 19859288691.
Replacement & Compatibility FAQ
Q: Is the 1746-IA16 a direct drop-in replacement for the DIM16?
A: Yes, the 1746-IA16 is the most commonly used functional equivalent. It occupies the same chassis slot and supports 120/240V AC inputs. Verify your field wiring voltage before installation.
Q: Can I use the DIM16 in a ControlLogix system?
A: No. The DIM16 is designed exclusively for the SLC 500 (1746) backplane. ControlLogix uses the 1756 chassis and I/O family.
Q: Is the DIM16 still in production?
A: The DIM16 is a legacy/obsolete part. Konmask.com sources it through verified secondary market channels. Contact us for current stock availability.
Q: What is the difference between DIM16 and 1746-IM16?
A: The 1746-IM16 is rated for 120V AC inputs, while the DIM16 is rated for 240V AC. They are not interchangeable without field wiring modification.
Q: Do you provide a certificate of conformance?
A: Yes, COC and inspection documentation are available upon request for all orders.
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Contact: support@konmask.com | +0086 19859288691
