Rail-mounted control system with improved cooling

A control system, comprising:

• a first input/output (I/O) assembly including a first base mounted to an elongated rail and a first module mounted to the base, the first module comprising circuitry for processing control signals, the first module extending between a first end and an opposite second end, the first end including openings therein to permit air to flow over the circuitry, the first I/O assembly further including a first air flow deflector extending from the base, the first air flow deflector including a blocking wall extending to an outer wall, the air flow deflector including an outer peripheral edge around the blocking wall and the outer wall, the peripheral edge and blocking wall forming a pocket with the first end of the first module;
• and
• a second I/O assembly mounted to the rail below the first I/O assembly, the second I/O assembly comprising circuitry for processing control signals, the second I/O assembly including at least one opening oriented toward the first end of the first module, wherein the first air flow deflector includes the blocking wall positioned to block warm air exiting the at least one opening of the second I/O assembly from entering the openings at the first end of the first module, and further wherein the outer peripheral edge defines an opening into the pocket to receive a fresh air flow into the openings at the first end of the first module.