RESPONSE TO CONTRACTOR QUESTIONS-Computer Interface Requirements.docx

RESPONSE TO CONTRACTOR QUESTIONS – COMPUTER INTERFACE REQUIREMENTS

SOLICITATION NBR FA6656-08-R-0004, Modify/Upgrade IWP System, Bldg 309

1. On Drawing E2, Item no. 6, we are to supply a new 13-slot chassis. Is that to replace the existing chassis to a larger size or is that a new expansion chassis? Response: It is not to replace the existing chassis to a larger size; it is expansion for new devices.

2. Also, Item no. 6 calls out for a 1747-SDN, how is that used in the new system? Response: This is the interface between the existing I/O and the new PLC.

3. Are the new analog 4-20ma signals from the flow transducers, and PH monitors being wired directly from the transducers to the new I/O modules in the SLC PLC? Response: The devices are connected to the PLC.

4. What about the I/O for the De Icing valves and the wiring, is it also being wired to the new I/O modules in the SLC PLC? Response: The devices are connected to the PLC.

5. I see in the drawings and the specifications where it calls out a fiber cable between the buildings, and the computer specification calls out a fiber connection. How is the PLC connecting to the fiber to get the data to the computer in item no. 12? Contractor shall furnish any/all equipment necessary to provide a fully operational system.

6. Is someone installing a router that will convert from CAT-5E to fiber at both ends? Response: The Contractor shall furnish any/all equipment necessary to provide a fully operational system.