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Din Rail Mounting The I/O carrier snaps easily onto a 7.5mm X 35mm DIN rail. The DIN rail must be electrically grounded to provide EMC protection. The rail must have a conductive (unpainted) corrosion-resistant finish. For applications requiring maximum resistance to mechanical vibration and shock, the carrier must also be panel-mounted. See chapter 2 for installation instructions. Features ƒ The Compact Box-Style I/O carrier supports wiring for up to 32 I/O points and 4 common/power connections. ƒ Easily-set keying dials to assure installation of the correct type of module on the carrier. Keys are set to match the keying on the bottom of the module. A complete list of module keying assignments is included in appendix D. ƒ Carrier-to-carrier mating connectors for quick installation of the backplane connection with no additional cables or tools needed. ƒ Module latch hole for securely fastening the module to the carrier. ƒ A printed wiring card provided with each I/O module can be folded and inserted in the built-in card holder.