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1746-IB32 1746-IV32 1746-OB32 SLC 500™ 32-Channel Digital I/O Modules

The electronic protection of the 1746-OB32E has been designed to provide protection for the module from short-circuit and overload current conditions. The protection is based on a thermal cut-out principle. In the event of a short circuit or overload current condition on an output channel, that channel will limit current within milliseconds after its thermal cut-out temperature has been reached. All other channels continue to operate as directed by the CPU (processor) module.

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Overview

Essential details：1746-IB32 1746-IV32 1746-OB32 SLC 500™ 32-Channel Digital I/O Modules

In addition to providing the module’s electrical specifications, this document tells you how to:
• install the module into the chassis
• install the Octal Filter Label
• wire the module
We assume you have already installed your chassis and power supply. If not, please refer to the installation instructions for these products before preceding.

1. Disconnect Power
2. Align the circuit board of the module with the chassis card guide. (A)
3. Slide the module into the chassis until the tip and bottom tabs lock into place. (B)
4. Refer to pages 16 through 19 for 32-point wiring instructions.
5. Route the wires down and away from the module, securing them with the wire tie. (C)
6. To keep the chassis free from debris, cover all unused slots with Card Slot Filler, Catalog Number 1746-N2.
To remove the module, disconnect wiring or pre-wired connector, press and hold the module release located on each self-locking tab (D), and slide the module out of the chassis slot.

The electronic protection of the 1746-OB32E has been designed to provide protection for the module from short-circuit and overload current conditions. The protection is based on a thermal cut-out principle. In the event of a short circuit or overload current condition on an output channel, that channel will limit current within milliseconds after its thermal cut-out temperature has been reached. All other channels continue to operate as directed by the CPU (processor) module.

1746-IB32

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1746-IB32 1746-IV32 1746-OB32 SLC 500™ 32-Channel Digital I/O Modules

The module does not provide protection against reverse polarity wiring or wiring to AC power sources. Electronic protection is not intended to replace fuses, circuit breakers, or other code-required wiring protection devices.

The 1746-OB32E performs auto-reset under overload conditions. When an output channel overload occurs as described above, that channel limits current within milliseconds after its thermal cut-out temperature has been reached. While in current limit, the output channel can cool below the thermal cut-out temperature, allowing the module to auto-reset and resume control of the output channel as directed by the processor until the thermal cut-out temperature is again reached.
Removing power from an overloaded output channel would also allow the output channel to cool below the thermal cut-out temperature allowing auto-reset to occur when power is restored. The output channel would operate as directed by the processor until the thermal cut-out temperature is again reached.
To avoid auto-reset of an output channel under overload conditions, an external mechanical fuse can be used to open the circuit when overloaded.

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