Allen-Bradley 1746-OW16 l Relay Output Module
Configured for discrete AC/DC load switching in SLC 500 chassis environments, the Allen-Bradley 1746-OW16 (1746-OW16 Digital Output Module) provides direct physical/electrical execution. It handles 16 electro-mechanical normally open (N.O.) relay output channels partitioned across two isolated commons. The module routes control signals directly from the SLC 500 backplane logic to solenoids, contactors, indicators, and motor starters without requiring interposing relays.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1746-OW16 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.06 lbs (0.48 kg) |
| Dimensions | Standard SLC 500 Single-Slot Module |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Minimum Watts: 5.17 W (0.033 W per point) |
| Backplane Current | 0.170 A at 5 VDC / 0.180 A at 24 VDC |
| Output Count | 16 Normally Open (N.O.) Relay Channels |
| Channel Grouping | 2 isolated groups (8 points per common) |
| Operating Voltage | 5 to 125 VDC / 5 to 265 VAC |
| Minimum Load Current | 10 mA at 5 VDC |
| Continuous Current Rating | 16.0 A AC total (8.0 A per common group) |
| Off-State Leakage | 0.0 mA |
| Signal Delay (Resistive Load) | On Delay: 10 ms; Off Delay: 10 ms |
Backplane Bus & Deterministic Output Control
The 1746-OW16 interfaces with the SLC 500 parallel backplane bus, receiving output bit status updates directly from the processor image table during each scan cycle. The module incorporates optical isolation between backplane logic circuitry and field-side contacts, protecting internal processors from switching transients. Discrete output bit states are latched deterministically, maintaining firmware flash compatibility and predictable switching speeds across all SLC 500 rack configurations.
Frequently Asked Questions
Q: What are the backplane current requirements for the 1746-OW16 relay module?
A: The module draws 0.170 A at 5 VDC and 0.180 A at 24 VDC directly from the SLC 500 rack power supply backplane bus.
Q: Can the 1746-OW16 switch both AC and DC voltages on the same module?
A: Yes, because the 16 outputs are divided into two electrically isolated groups of 8 points each, each group common can operate on a separate AC or DC field voltage source within rated operating limits (5-125 VDC / 5-265 VAC).
Field Installation Guidelines
- Power Isolation: De-energize system backplane power and external field load power before inserting or removing the module from the SLC 500 rack.
- Module Slot Alignment: Slide the module firmly into the designated SLC 500 chassis slot until the top and bottom retaining clips snap into place.
- Field Wiring Terminal Block: Connect field conductors to the 1746 removable terminal block (RTB). Ensure the 8-point groups are wired to their respective common terminals (VAC/VDC COM 0 and COM 1).
- Current Limiting Protection: Install external fast-acting fuses for each group common to protect relay contacts from overcurrent and short-circuit damage (maximum 8.0 A per common).
- Inductive Load Suppression: Install external surge suppressors (movs or flyback diodes) across inductive field loads to prevent contact arcing and electro-magnetic interference.
Allen-Bradley 1746-OW16 l Relay Output Module
Allen-Bradley 1746-OW16 l Relay Output Module
Configured for discrete AC/DC load switching in SLC 500 chassis environments, the Allen-Bradley 1746-OW16 (1746-OW16 Digital Output Module) provides direct physical/electrical execution. It handles 16 electro-mechanical normally open (N.O.) relay output channels partitioned across two isolated commons. The module routes control signals directly from the SLC 500 backplane logic to solenoids, contactors, indicators, and motor starters without requiring interposing relays.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1746-OW16 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.06 lbs (0.48 kg) |
| Dimensions | Standard SLC 500 Single-Slot Module |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Minimum Watts: 5.17 W (0.033 W per point) |
| Backplane Current | 0.170 A at 5 VDC / 0.180 A at 24 VDC |
| Output Count | 16 Normally Open (N.O.) Relay Channels |
| Channel Grouping | 2 isolated groups (8 points per common) |
| Operating Voltage | 5 to 125 VDC / 5 to 265 VAC |
| Minimum Load Current | 10 mA at 5 VDC |
| Continuous Current Rating | 16.0 A AC total (8.0 A per common group) |
| Off-State Leakage | 0.0 mA |
| Signal Delay (Resistive Load) | On Delay: 10 ms; Off Delay: 10 ms |
Backplane Bus & Deterministic Output Control
The 1746-OW16 interfaces with the SLC 500 parallel backplane bus, receiving output bit status updates directly from the processor image table during each scan cycle. The module incorporates optical isolation between backplane logic circuitry and field-side contacts, protecting internal processors from switching transients. Discrete output bit states are latched deterministically, maintaining firmware flash compatibility and predictable switching speeds across all SLC 500 rack configurations.
Frequently Asked Questions
Q: What are the backplane current requirements for the 1746-OW16 relay module?
A: The module draws 0.170 A at 5 VDC and 0.180 A at 24 VDC directly from the SLC 500 rack power supply backplane bus.
Q: Can the 1746-OW16 switch both AC and DC voltages on the same module?
A: Yes, because the 16 outputs are divided into two electrically isolated groups of 8 points each, each group common can operate on a separate AC or DC field voltage source within rated operating limits (5-125 VDC / 5-265 VAC).
Field Installation Guidelines
- Power Isolation: De-energize system backplane power and external field load power before inserting or removing the module from the SLC 500 rack.
- Module Slot Alignment: Slide the module firmly into the designated SLC 500 chassis slot until the top and bottom retaining clips snap into place.
- Field Wiring Terminal Block: Connect field conductors to the 1746 removable terminal block (RTB). Ensure the 8-point groups are wired to their respective common terminals (VAC/VDC COM 0 and COM 1).
- Current Limiting Protection: Install external fast-acting fuses for each group common to protect relay contacts from overcurrent and short-circuit damage (maximum 8.0 A per common).
- Inductive Load Suppression: Install external surge suppressors (movs or flyback diodes) across inductive field loads to prevent contact arcing and electro-magnetic interference.
