The ABB TU840/TB840/TB840A Optical ModuleBus Modem is a device that allows you to connect an ABB S800 I/O system to an optical ModuleBus network.

It has two fiber optic ports for connecting to the optical ModuleBus, and one electrical ModuleBus port for connecting to the I/O modules.

• Two fiber optic ports for connecting to the optical ModuleBus
• One electrical ModuleBus port for connecting to the I/O modules
• Supervisory functions of I/O ModuleBus and power supply
• Isolated power supply to I/O modules
• Redundancy support

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