The 1756-OB32 is a 32-point digital DC output module from Rockwell Automation's Allen-Bradley ControlLogix series.
It converts controller logic commands into switch signals recognizable by field actuators, driving loads such as relays, solenoid valves, indicator lights, and motor starters. This high-density module occupies only one slot, significantly saving rack space and making it an ideal choice for achieving high-density discrete control outputs in ControlLogix systems.
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Core Features
- ✓ 32-channel DC source output: Provides 32 independent DC source output channels, divided into 2 groups of 16 points each, enabling simultaneous control of multiple load devices.
- ✓ Wide Voltage Range: Supports 10-31.2 VDC output voltage (nominal 12/24 VDC), compatible with various industrial field actuators.
- ✓ Fast response: Short output delay time, typical OFF→ON value 60 µs, typical ON→OFF value 200 µs, meeting high-speed control requirements.
- ✓ Status indicators: Each output channel is equipped with an independent status LED, and also features a module health indicator for easy and rapid on-site diagnostics.
Technical Specifications
| Brand |
Allen Bradley
|
| Model / Part Number |
1756-OB32 |
| Input Points |
32 points, divided into 2 groups (16 points per group) |
| Input Voltage Range |
10 - 31.2 VDC (nominal 12/24 VDC) |
| Output delay time |
OFF→ON: 60 µs (typical) / 1 ms (maximum); ON→OFF: 200 µs (typical) / 1 ms (maximum) |
| Output current per point |
0.5 A @ 50°C; 0.35 A @ 60°C |
| Output current per group |
4 A @ 50°C / 60°C |
| Total module current |
16 A @ 50°C; 10 A @ 60°C |
| Backplane current consumption |
300 mA @ 5.1V DC |
| Power consumption (maximum) |
4.8 W @ 60°C |
| Heat dissipation |
16.4 BTU/hour @ 60°C |
| Isolation voltage |
50 V (continuous), output to backplane |
| Operating temperature |
0°C to +60°C |
| Storage temperature |
-40°C to +85°C |
| Installation |
ControlLogix rack mount, occupies 1 slot |
| Compatible RTB terminal block |
1756-TBCH or 1756-TBS6H |
| Dimensions (HxWxD) |
Approx. 5.5 x 3.7 x 14.0 cm / 2.17 x 1.46 x 5.51 in |
Frequently Asked Questions
Q: What types of loads can the 1756-OB32 drive?
A: It can drive various DC-powered actuators, such as relay coils, solenoid valves, indicator lights, motor contactors, alarms, etc. Note that this module is a sourcing output, meaning the output terminal provides a positive voltage, and the other end of the load needs to be connected to a DC common terminal.
Q: Will the load capacity of the 1756-OB32 decrease in high-temperature environments?
A: Yes, it will decrease, requiring derating. At an ambient temperature of 50°C, the maximum output current per point is 0.5A, and the total module current is 16A; when the ambient temperature rises to 60°C, the derating per point is 0.35A, and the total module current is drated to 10A. When designing a system, the ambient temperature needs to be fully considered, and the load should be allocated appropriately.
Q: In which racks can the 1756-OB32 be installed? What accessories are required?
A: It has good compatibility. This module occupies one slot and can be installed in any standard ControlLogix 1756 series rack (including 1756-A17, A13, A10, A7, A4, etc.). During installation, a removable terminal block (RTB) is required to connect field signal cables; the recommended models are 1756-TBCH or 1756-TBS6H.
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