AB 1746-IB32 ser D SLC 500 32-Channel DC Digital Input Module 15-30V

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1769-IT6

Brand Name                 AB

Product reference       1746-IB32

Wiring Diagrams

In this document, the wiring diagrams include both decimal and octal numbers. To wire your module when used in an SLC system, use the decimal numbers. To wire your module when used in a PLC system, use the octal numbers.

Input Module 1746-IB32 (24V dc Sinking)

(1) See decimal and octal coding information at the top of the page. 

(2) The dc Com pins on the 1746-IB32 input module are isolated between the four groups and the two com pins in each group are connected internally. To maintain group isolation provided by 32-point I/O modules, use a 1492 terminal block that provides group isolation. Consult 1492 documentation or your Allen-Bradley Sales Office for additional information.

Input Module 1746-IV32 (24V dc Sourcing)

(1) See decimal and octal coding information on page 16. (2) The V dc pins on the 1746-IV32 input module are isolated between the four groups and the two V dc pins in each group are connected internally. To maintain group isolation provided by 32-point I/O modules, use a 1492 terminal block that provides group isolation. Consult 1492 documentation or your Allen-Bradley Sales Office for additional information.

Electronically Protected Module (1746-OB32E) Electronic Protection 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.

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.

Wiring Options for the I/O Module Included with your 32-point I/O module is a keyed 40-pin female connector and crimp type pins. These components allow you to wire I/O devices to the module using a 40-conductor cable or individual wires. The wiring diagrams on pages 16 through 19 show the I/O terminations of the connector for your specific module. Refer to page 15 for connector/pin assembly instructions. When assembled, align the female connector over the modules male header using the keying slot as a guide. Firmly lock them together with the upper and lower retaining arms. 1492 pre-wired cables and interface modules can be used for connecting external I/O. There are two options for wiring the 32-point I/O module. Option 1 - Wiring the 1746-N3 Connector

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