The Allen-Bradley 1746-OBP16, also cataloged as the 1746-OBP16 Output Module, serves as the primary 1746-OBP16 Product Type utilized to execute discrete current-sourcing tasks across SLC 500 platforms.
| Parameter | Specification |
|---|---|
| Model | 1746-OBP16 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.25 kg (Shipping Weight 2 kg) |
| Dimensions | 145 x 35 x 130 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Backplane current: 0.250 A @ 5 VDC, 0.0 A @ 24 VDC |
| Output Channels | 16 sourcing outputs |
| Points per Common | 16 |
| Operating Voltage Range | 20.4 to 26.4 VDC (source) |
| Continuous Current per Point | 1.5 A @ 30 deg C, 1.0 A @ 60 deg C |
| Continuous Current per Module | 6.4 A @ 0 to 60 deg C |
| Max On-State Voltage Drop | 1.0 V @ 1.0 A |
| Surge Current per Point | 4.0 A for 10 ms |
| Surge Current per Module | 32.0 A for 10 ms |
| Off-State Leakage | 1 mA max |
| Min Load Current | 1 mA |
| Signal Delay (Resistive Load) | On = 0.1 ms, Off = 1.0 ms |
| Isolation Voltage | 1500 V AC for 1 second (channel-to-backplane) |
| Electronic Protection | None |
| Mounting Style | Installed in SLC 500 chassis |
The 1746-OBP16 coordinates discrete switching operations matching the backplane bus communication velocity properties of the legacy chassis. To support extensive localized I/O density scaling routines, the hardware interfaces directly with central processing units via parallel chassis backplanes or remote scanners across Profinet / EtherNet/IP deterministic networks. Maintaining exact firmware flash compatibility across network infrastructure modules is necessary to manage the 16-point sourcing bit-map without inducing signal propagation latencies or cyclic data packet timeouts.
Q: Does the 1746-OBP16 feature active short-circuit or thermal electronic protection?
A: No. The internal circuitry specifies no built-in electronic protection loops. External fast-acting fuses or current-limiting devices must be implemented on each sourcing output channel to protect the solid-state components from short-circuit faults and overcurrent conditions.
Q: Can the 1746-OBP16 be hot-swapped while the SLC 500 chassis backplane power is active?
A: No. The SLC 500 architecture lacks Removal and Insertion Under Power (RIUP) capability. The chassis power supply must be completely isolated and de-energized prior to inserting or removing the module to prevent physical degradation of the backplane connectors and logic chips.
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