FOUNDATION Fieldbus H1 level has been designed as a digital replacement of the 4 to 20mA standard in the process industries. FOUNDATION Fieldbus is also a LAN (Local Area Network) for instruments used in both process and manufacturing automation with built-in capability to distribute the control application across the network. The physical wiring is also fully compatible with intrinsic safety (IS) or nonincendive wiring standards and may be used in hazardous, as well as general purpose areas. In hazardous areas standard explosionproofing or power limited concepts may be used, as well as IS concepts, offering greater cabling design flexibility.
When using a StoneL VCT module and integrating it into the FOUNDATION Fieldbus (FF) network illustrated, there are significant savings. This system consists of 16 automated valve systems located in a cluster approximately 200 feet from the I/O rack. Each of the automated valves is located 20 feet apart in the cluster. Following is an estimated comparison:
The Stonel FOUNDATION Fieldbus I/O modules have an auxiliary 4 to 20mA input and a 4 to 20mA output which is powered from the supplemental 24VDC supply bus. Additional savings may result from connecting the 4 to 20mA device directly to the Stonel I/O instead of running wires back to I/O at the controller. The additional analog input would be represented as an AI (Analog Input) function block as part of the StoneL device description.
The 4 to 20mA instrument may be conveniently wired directly into the StoneL I/O module. With a conventional system the control would need a 200 foot run back to the controller. Other savings would result from:
When using a StoneL VCT module and integrating it into the FOUNDATION Fieldbus (FF) network illustrated, there are significant savings. This system consists of 16 automated valve systems located in a cluster approximately 200 feet from the I/O rack. Each of the automated valves is located 20 feet apart in the cluster. Following is an estimated comparison:
The Stonel FOUNDATION Fieldbus I/O modules have an auxiliary 4 to 20mA input and a 4 to 20mA output which is powered from the supplemental 24VDC supply bus. Additional savings may result from connecting the 4 to 20mA device directly to the Stonel I/O instead of running wires back to I/O at the controller. The additional analog input would be represented as an AI (Analog Input) function block as part of the StoneL device description.
The 4 to 20mA instrument may be conveniently wired directly into the StoneL I/O module. With a conventional system the control would need a 200 foot run back to the controller. Other savings would result from: