Sourcing vs. Sinking: How does the 1793-OB16P switch loads?
This is a 16-channel sourcing module. In plain terms, it switches the positive DC leg (the "source") to your field device. It's built for 24V DC nominal systems but handles a wide voltage swing--anywhere from a 10V floor up to a 31.2V ceiling.
What are the hard limits on per-channel current?
The module supports a continuous load of 500 mA per point. It can technically trigger with as little as 1 mA, making it compatible with high-impedance electronic inputs. Just ensure your total rack current doesn't exceed the adapter's capacity when all 16 points are energized.
Handling Inductive Loads: Can it survive inrush surges?
Yes. The hardware is rated for a 1.5 A surge lasting up to 50ms. This is specifically designed to handle the "kick" from solenoids or starter coils. You can repeat this surge every 2 seconds; any faster and you risk thermal stress on the output transistors.
How do I avoid "Ghost Signals" from off-state leakage?
With an off-state leakage max of 0.5 mA, the module is quite "clean." This low threshold prevents sensitive relays or low-wattage LED indicators from staying dimly lit or failing to drop out when the PLC command is removed.
Is the switching speed fast enough for high-speed packaging?
The module is snappy: 0.5 ms for turn-on and 1.0 ms for turn-off. While not quite at the level of specialized motion-control high-speed outputs, it's more than enough for standard discrete logic, conveyor sorting, and typical solenoid sequencing.
Backplane Budgeting: What is the Flexbus impact?
You need to budget 80 mA of Flexbus current for this card. Don't forget to add this to your total power calculation for the FLEX I/O rail. If you're stacking multiple 16-point cards, double-check that your 1794-ASB or 1794-AENT adapter can handle the cumulative draw.
Installation Steps
| Step |
Action |
Notes |
| 1 |
Remove cover plug from male connector of the unit. |
Only if a plug is installed. |
| 2 |
Position module on 35 × 7.5 mm DIN rail (A-B part no. 199-DR1). |
Align top of rail under rear lip. |
| 3 |
Press module down to lock. |
If module does not lock, push locking tab down with a screwdriver, press flush, release tab. |
| 4 |
Connect to adjacent module or terminal base. |
Push firmly until modules click together. |
| 5 |
Repeat steps for additional modules. |
- |
| 6 |
To remove module: start from right side, remove one module at a time. |
Insert screwdriver between modules, turn ¼ turn, slide module away, release locking lever. |
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Current Hot-Stock Categories:
Rockwell/Allen-Bradley: 1756, 1747 Series.
Siemens: Moore, S5 Series (Legacy).
Invensys Foxboro: FCP270, FBM Series.
Compatible Allen Bradley Products
| Allen Bradley |
Allen Bradley |
Allen Bradley |
| 1756-L71S |
1756-OB16IS |
1769-L33ER |
| 1756-L72S |
1756-OF4 |
1769-L35E |
| 1756-LSP |
1756-OF8 |
1771-HS3A |
| 1756-M02AE |
1756-PB75R |
1771-IFEK |
| 1756-M03SE |
1756-RM |
1771-IK |
| 1756-M08SE |
1756-RM2 |
1771-IL |
| 1756-M16SE |
1766-L32BXB |
1771-IR |
| 1756-OA16I |
1766-L32BXBA |
1771-NIS |
| 1756-OA8D |
1769-IR6 |
1771-OZL |
| 1756-OB16E |
1769-L30ER |
1771-P4R |
| 1772-LN2 |
1797-TB3 |
80190-380-02-R |
| 1783-BMS10CL |
20-750-S |
80190-480-01-R |