1746-OBP16 — SLC 500 16-Point High-Current DC Output Module, Fused

The 1746-OBP16 is a 16-point sourcing DC output module for the SLC 500 modular chassis, rated at 1.5A per point at 30°C (1A at 60°C) with an integrated common fuse providing short-circuit protection across all 16 channels. A fast turn-off design gives this module a meaningfully shorter OFF delay than standard SLC 500 output modules when switching inductive loads — a deliberate feature for applications where quick output response on de-energization matters.

Specifications

Parameter	Value
Part Number	1746-OBP16
Output Points	16, single fused common
Output Type	Sourcing, 24V DC
Operating Voltage Range	20.4–26.4V DC
Current per Point	1.5 A @ 30°C, 1 A @ 60°C
Total Module Current	~6.4 A
Step Response	0.1 ms ON, 1 ms OFF
Fuse Protection	Integrated common fuse, with blown-fuse LED indicator
Backplane Current	250 mA @ 5V DC
JP1 Jumper	Sets processor behavior on fuse blow (Continue / Fault)
Operating Temperature	0°C to 60°C

Fused Protection With Per-Channel Fault Isolation

The module's integrated fuse protects against short-circuit conditions on wiring using 16 AWG or heavier conductors — when a short occurs, the fuse blows, the blown-fuse LED illuminates, and all 16 outputs on the shared common deactivate simultaneously, since the fuse protects the common rather than each individual point. This is a meaningful distinction from per-point electronically protected output modules: a fault anywhere on this module takes down all 16 outputs together, not just the affected channel, so applications with critical individual outputs that must remain isolated from a fault elsewhere might be better served by a per-point protected alternative.

The JP1 jumper setting determines system-level behavior when the fuse blows — "Processor Continues" keeps the controller scanning with this module's outputs simply deactivated, while "Processor Faults" halts the entire controller. The choice depends on whether the application can safely continue operating with this specific output bank disabled, or whether a fuse event here should stop the whole process as a safety measure.

FAQ

Q: Does the integrated fuse provide overload protection as well as short-circuit protection?

No. The fuse protects against short circuits only. Overload protection requires user-supplied external fuses matched to each connected load, sized appropriately for the specific device being switched.

Q: If the fuse blows, do all 16 outputs go off or just the affected channel?

All 16 outputs deactivate together, since they share one common fuse rather than individual per-point protection. The module must be removed to replace the fuse, and the actual fault condition must be corrected before power is restored.

Q: What replacement fuse is used for this module?

A 10A fuse from the recommended fuse kit is the standard replacement — the module ships with the appropriate fuse installed, and spare fuse kits are available separately for field replacement.

Q: Is external surge suppression needed for inductive loads on this module?

Generally not at the load itself, since the module's fast turn-off design already incorporates suppression internally. An exception applies if another contact is wired in series with the load — in that case, a reverse-wired diode across the load is recommended, though this does reduce the fast turn-off benefit.

1746-OBP16 New Original SLC500 Output Module Ser.C 1746OBP16