To: Monika Fuentes: Siemens FAX 334/626-0984

From: Jon Hagen, Sr. Staff Engineer, Arecibo Observatory

Date: 2-21-01

Subject: Automation spares

Dear Ms. Fuentes,

In addition to the power supply module you quoted for Luis Murray, we are also in need of the following S5-135U components:

1. Instruction manual for our our spare model CP 581 AT compatible computer, model 6ES5 581-0ED14. This model is quite different from our –1EA11 (for which we do have a 2-volume manual).

2. Mass storage module (hard disk drive and diskette drive) for above

version CP581 (the -0ED14) . The storage unit part number from Catalog ST50,1998, page 4/99, is 6ES5 581-3LA11. But the 581 AT (on the same page) is a 6ES5 581 -0ED13, so maybe this is not the right part number for a storage unit to fit our -0ED14.

Please furnish us with price/delivery information as soon as possible.

Sincerely,

Jon Hagen

Tel. 787/ 878 2612 ext 328

Fax: 787/ 817 2740

email: jonhagen@naic.edu