200 C Street, S.W.
Washington, DC 20204
March 15, 1991
TO: All Regional Food and Drug Directors
Attn: Regional Milk Specialists
FROM: Milk Safety Branch (HFF-346)
SUBJECT: Programmable Logic Controller System for Flow Diversion Device, Models FDVC 5025P and FDVC 5027P, Manufactured and Distributed by Custom Control Products Inc.
The above subject dairy equipment has been reviewed by Milk Safety Branch and Food Engineering Branch and found to comply with the applicable construction criteria, the intent of the Grade `A' Pasteurized Milk Ordinance and Coded memo M-I-88-11 regarding the use of computerized systems for public health controls on HTST pasteurizers.
The programmable logic controller (Allen Bradley SLC 100) shall be programmed in conformance with the ladder logic diagrams supplied with the installation manuals. It shall be installed in accordance with the internal wiring diagram, field wiring and appropriate interconnect drawing which are also included with the installation manual. Copies of the ladder logic and wiring diagrams shall be supplied to the regulatory agency prior to installation.
Model FDVC 5025P is intended to be used with those flow diversion devices which have the air solenoids mounted on the valve actuators such as the APV device. The Model FDVC 5027P is intended to be used with flow diversion devices which utilize remote solenoids that are located in the control panel such as Cherry-Burrell, Tri-Clover and G&H.
Any flow diversion device utilizing the Custom Controls Products, Inc. system must be tested and pass all tests in the Grade `A' Pasteurized Milk Ordinance for dual flow diversion devices. The device panel box with the solenoids and the programmable controller will have provisions for a seal and must be sealed after complying with all applicable tests.In addition the SLC 100 will have a plastic plate with provisions for a seal which denies access to the programing port and EEPROM memory card. The EEPROM memory card supplied by the firm has been modified so that it cannot be permanently reprogrammed. The firm will place its own trademark on the inside of each EEPROM memory card. If the regulatory agency has any questions concerning the program in the SLC 100, the memory card may be pulled from the SLC 100 to check for the distinguishing trademark.
Descriptive literature for this flow diversion device control is included for your files. States desiring further information or copies of the literature may contact:
CUSTOM CONTROL PRODUCTS, INC.
1300 N. Memorial Drive
Racine, WI 53404
Attn: Per O. Andersson
Sufficient copies of this memorandum are enclosed for distribution to state milk control agencies and state milk sanitation rating officers in your region/district.
FDA's review of this dairy equipment and our findings that they comply with the applicable construction criteria of the Grade `A' Pasteurized Milk Ordinance does not constitute agency endorsement or approval of the dairy equipment and any representation on a label or in any printed literature that they are `FDA approved' would be false.
Robert L. Sanders
Deputy Chief Milk Safety Branch