AB 1771-OB Pre-installation Considerations

Pre-installation Considerations:

The 1771–OB module can control the following output devices:

·dc motor starters

·indicators

·solenoids

Power Requirements：

Your module receives its power through the 1771 I/O chassis backplane from the chassis power supply.  The module requires 165mA from the output of this supply.  Add this to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or backplane power supply.

Keying Your I/O Chassis:

Use the plastic keying bands, shipped with each I/O chassis, to key the I/O slots to accept only this type of module.

The module circuit board is slotted in two places on the rear edge.      

 The position of the keying bands on the backplane connector must correspond to these slots to allow insertion of the module.       

You can key any connector in an I/O chassis to receive this module except for the left–most connector reserved for adapter or processor modules.       

Place keying bands between the following numbers labeled on the backplane connector:

·Between 4 and 6

·Between 18 and 20

You can change the position of these keys if system redesign and rewiring makes insertion of a different module necessary.

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