The 1756-OB16D from Allen-Bradley is a high-performance digital DC output module designed for the ControlLogix platform, offering 16 discrete outputs with advanced diagnostics. Each output channel operates at 24V DC (nominal) with a continuous current rating of 2.0 A per point (derated at elevated temperatures). The module supports both sinking and sourcing configurations via the user-configurable field wiring, and features per-point overcurrent protection, short-circuit detection, and open-wire detection for enhanced system integrity. The diagnostic feedback is accessible through the ControlLogix backplane, allowing seamless integration with RSLogix 5000 or Studio 5000 environments. The module requires a 24V DC power supply for field-side operation and consumes 150 mA from the backplane (5V DC). It is housed in a rugged, industrial-grade enclosure rated for 0 to 60°C ambient operation and supports hot-swap replacement in live chassis. The 1756-OB16D is ideal for applications requiring high-density output control with real-time fault monitoring, such as valve actuators, motor starters, and indicator lights in process or discrete manufacturing.
| Parameter |
Specification |
| Product Type |
Digital DC Output Module |
| Model |
1756-OB16D |
| Number of Outputs |
16 (individually isolated) |
| Output Voltage Rating |
24V DC nominal (18-30V DC range) |
| Output Current per Point |
2.0 A continuous at 30°C; derate to 1.0 A at 60°C |
| Total Output Current (Module) |
8.0 A maximum (all points on) |
| Output Type |
Solid-state (MOSFET), sourcing or sinking (field configurable) |
| Diagnostic Features |
Per-point open-wire, short-circuit, and overcurrent detection |
| Backplane Current (5V DC) |
150 mA typical |
| Backplane Current (24V DC) |
None (field-side power required) |
| Field Power Requirement |
24V DC (user-supplied, 0.5 A minimum) |
| Isolation Voltage |
250V DC (output to backplane) |
| Response Time (Off to On) |
0.5 ms typical |
| Response Time (On to Off) |
0.5 ms typical |
| Terminal Block Style |
Removable (1756-TBCH or 1756-TBS6H) |
| LED Indicators |
16 green output status LEDs; 1 red diagnostic LED |
| Operating Temperature |
0°C to 60°C (32°F to 140°F) |
| Storage Temperature |
-40°C to 85°C (-40°F to 185°F) |
| Relative Humidity |
5% to 95% (non-condensing) |
| Vibration Resistance |
2 g Standard Models 57-2000 Hz per IEC 60068-2-6 |
| Shock Resistance |
30 g peak, 11 ms per IEC 60068-2-27 |
| Weight |
0.45 kg (1.0 lb) approximate |
| Certifications |
UL 508, CSA C22.2 No. 142, CE, ATEX (when installed in suitable enclosure) |
| Compatible Chassis |
1756-A4, A7, A10, A13, A17 (ControlLogix) |
| Communication Protocol |
ControlBus (backplane) |
| Software Support |
RSLogix 5000, Studio 5000 (v20 or later) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22