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Technical specifications for 1746-OW16
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Manufacturer:Allen-Bradley
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Product Category:PLC Systems
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Spare Part Number:1746-OW16
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Weight:0.32 kg
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Tariff Code:8537101190
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Relay outputs:16
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Common groups:2; 8 points per common
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DC switching range:5-125 V DC
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AC switching range:5-265 V AC
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5 V backplane current:170 mA
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24 V backplane current:180 mA
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Maximum on delay:10 ms; resistive load
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Maximum off delay:10 ms; resistive load
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Off-state leakage:0 mA maximum
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Minimum load:10 mA at 5 V DC
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AC module continuous current:16 A
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Continuous current per common:8 A
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Field termination:Removable terminal block
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Terminal wire limit:2 mm2 (14 AWG); max. 2 wires
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Terminal wiring torque:0.9 N m maximum
Information
Overview
Downloads
Applications / Compatibility
Product Precautions
- Allen-Bradley 1746-OW16 provides contact-based field switching where an SLC 500 installation needs relay outputs rather than semiconductor output stages. Its two common groups define how external load supplies and circuit returns are organized.
Output topology: Sixteen relay points in two groups of eight
Switching range: 5-125 V DC or 5-265 V AC
Backplane demand: 170 mA at 5 V DC and 180 mA at 24 V DC
Switching range: 5-125 V DC or 5-265 V AC
Backplane demand: 170 mA at 5 V DC and 180 mA at 24 V DC
Sixteen relay outputs are divided into two groups with eight points per common. The field switching range is 5-125 V DC or 5-265 V AC, using an external load supply. The removable terminal block preserves the grouped field connection, and each common must be assessed together with the connected circuits.
Backplane consumption is 170 mA at 5 V DC and 180 mA at 24 V DC. Maximum on and off delay is 10 ms under resistive-load conditions. Maximum off-state leakage is 0 mA, and the minimum load is 10 mA at 5 V DC. The module AC continuous-current limit is 16 A, with 8 A per common; individual relay contact ratings and load characteristics must also be respected.
Install or remove the module only with chassis power disconnected and field supplies isolated. The first chassis slot is reserved for the processor or 1747-ASB. Align the module with the card guide, latch it fully and retain the correct terminal-block identity. Inductive-load suppression and suitable circuit protection are part of the field design, not substitutes for the relay rating.
Backplane consumption is 170 mA at 5 V DC and 180 mA at 24 V DC. Maximum on and off delay is 10 ms under resistive-load conditions. Maximum off-state leakage is 0 mA, and the minimum load is 10 mA at 5 V DC. The module AC continuous-current limit is 16 A, with 8 A per common; individual relay contact ratings and load characteristics must also be respected.
Install or remove the module only with chassis power disconnected and field supplies isolated. The first chassis slot is reserved for the processor or 1747-ASB. Align the module with the card guide, latch it fully and retain the correct terminal-block identity. Inductive-load suppression and suitable circuit protection are part of the field design, not substitutes for the relay rating.
Controller platform reference: Allen-Bradley SLC 500 digital I/O. Follow approved chassis and field-wiring instructions.
SLC 500 Digital I/O Modules, 1746-IN027D-EN-P, December 2012: preserved manufacturer technical information applicable to this configuration. The separate installation guide covers chassis isolation, two-common field wiring, backplane budgeting and relay-output acceptance.
1746-OW16 Official Technical Reference Excerpt
SLC 500 Digital I/O Modules, 1746-IN027D-EN-P, December 2012: preserved manufacturer technical information applicable to this configuration. PDF · 8 pages.1746-OW16 Installation & Verification Guide
Apter Power field guide covering chassis isolation, two-common field wiring, backplane budgeting and relay-output acceptance. PDF · 5 pages.
Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
System and supply context: 1746-OW16 belongs to the SLC 500 chassis system and uses externally supplied relay load circuits. Verify the installed chassis, slot allocation, terminal block and programmed output addresses.
Application scope: Suitable uses are contact-switched discrete loads within the approved ratings. Application examples do not imply a universal safety rating, high-speed duty capability or interchangeability with newer I/O families.
Application scope: Suitable uses are contact-switched discrete loads within the approved ratings. Application examples do not imply a universal safety rating, high-speed duty capability or interchangeability with newer I/O families.
AC control circuits
Switch suitable AC loads while observing the common-group arrangement and contact ratings.DC discrete loads
Use the external DC circuit within the specified operating range and applicable contact limits.Mixed machine functions
Allocate sixteen discrete commands across two common groups according to the wiring design.Legacy SLC service
Maintain an existing SLC output position with the correct terminal mapping and accepted output behavior.
Prepare Allen-Bradley 1746-OW16 for its configured installation using these checks.
Isolate chassis and field power
Do not insert, remove or wire the module with chassis power applied.
Preserve common grouping
Keep eight-point group wiring and supply assignments consistent with the terminal diagram.
Budget both backplane rails
Include 170 mA at 5 V and 180 mA at 24 V in the chassis calculation.
Assess contact duty
Check load type, inrush, switching frequency and the individual contact rating.
Verify terminal identity
Keep the removable block matched to its module and circuit labels.
Test actual field action
Check commanded state and load response under a controlled maintenance plan.
Alternative Names
1746-OW16
Allen-Bradley 1746-OW16
1746-OW16 Relay Output Module
Technical notes
Current limits: The module and common limits are aggregate limits and do not replace individual contact load ratings.
Timing condition: The 10 ms maximum on/off values apply to resistive loads.
Power separation: External field power remains a separate isolation point from chassis power.
FAQ View All FAQ
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Are the 1746-OW16 outputs individually isolated from every other point?No. They are arranged as two groups of eight points per common. Keep each load circuit within the correct common group and follow the exact terminal diagram.
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Does 1746-OW16 supply the voltage that powers the external load?No. The contacts switch an externally supplied circuit. Backplane consumption powers the module; it is not a field-load power budget.
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How much SLC backplane capacity does 1746-OW16 require?Allocate 170 mA from the 5 V DC rail and 180 mA from the 24 V DC rail, then include the demands of the other chassis modules.
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Is 1746-OW16 suitable for a high-speed pulse train?Its maximum on and off delay is 10 ms with resistive loads. Relay switching duty and contact behavior must be assessed; it is not a dedicated high-speed pulse-output module.
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Can every 1746-OW16 output carry the common-group current limit?No. The 8 A common limit and 16 A AC module limit are aggregate limits. Each contact must also remain within its applicable voltage, load and switching rating.
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What does the 1746-OW16 minimum-load specification mean for a small signal?The specified minimum is 10 mA at 5 V DC. A circuit below the required operating load should not be assumed to have the same reliable relay-contact behavior.
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May 1746-OW16 be unplugged while the chassis remains energized?No. Disconnect chassis power before installing, removing or wiring the module, and isolate external field supplies before working on its terminals.
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Why is suppression considered for inductive loads switched by 1746-OW16?Inductive switching creates transients that stress contacts. Select suppression appropriate to the actual load and supply; it supports contact life but does not increase the permitted relay rating.
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