The I/O interface carrier plugs on to the power/controller carrier. The power/controller carrier supplies the system power and communications between the I/O interfaces and the controller. The controller processes the I/O interface information. An additional power/controller carrier is required for use with redundant controllers.

Mount your interface carrier on a T-type DIN rail. The I/O interface carrier includes the connections for the bulk 24 V DC field instrument power, I/O interfaces, and terminal blocks. Each I/O interface carrier is equipped with a connector that allows an additional I/O interface carrier to be plugged on to it. Up to 64 I/O interfaces on eight 8-wide I/O interface carriers are supported by a single I/O subsystem. For the horizontal-mount solution, 1-wide local bus extenders allow you to continue the I/O bus on a different row of carriers. There are two types of 8-wide I/O interface carriers available. They both have connectors for field power on the top of the carrier. The original carrier connects each set of field power terminals to two I/O cards, and the other option have individual field power per card slot and is ideal if separate field power is required for redundant I/O cards.

With the introduction of DeltaV SIS the left one-wide and right one-wide dual carrier extenders have two, 44-pin D- Shell connectors which supports dual cables for a fault tolerant configuration. The A and B connectors are in parallel so either port may be used. The new dual carrier extenders are a pre-requisite for DeltaV SIS as these also provide extension of the redundant safety bus used by the Safety Logic Solvers. The VerticalPLUS mount carriers also support dual cables and can be used with DeltaV SIS. Refer to the new VerticalPLUS Carrier Product Data Sheet for more details on these new carriers.

The horizontal carrier family also offers a 2-wide power carrier. Use this carrier, along with one or two system power supplies to provide 12 V DC local bus power connected through the carrier extenders. There are two 12 V DC output connections powered by either supply. For redundant power, ensure that the power demand is within the output range of one system power supply

With the introduction of the PK controller, a 4 wide I/O carrier is available for use with M-series I/O cards when a smaller footprint for the hardware is required. The 4-wide carrier allows for individual field power per card slot and is ideal if separate field power is required for redundant I/O cards.