Opto 22 G4LAX and G4RAX analog expansion bricks each allow up to eight additional Opto 22 G4 analog I/O modules to be used with Opto 22 G4A8L and G4A8R analog bricks. The G4LAX expansion brick is used with the local G4A8L analog brick, and the G4RAX expansion brick is used with the remote G4A8R analog brick.

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