Year 2000 (Y2K) Embedded Systems & Infrastructure Problem Message Board

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Technology Stocks : Year 2000 (Y2K) Embedded Systems & Infrastructure Problem

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To: John Mansfield who wrote (117)	2/27/1998 2:23:00 PM
From: John Mansfield	Read Replies (2) of 618

TECHNICAL - 'the control system released effluent for 90 years plus 2 hours.' 45. Author: David C. Hall ( dhall ) Date: Feb. 26 2:13 PM 1998 Note from P dJ's maillist: Relates to control systems used for effluent release. The control equipment in question had a master timer and various sub-timers for specific functions. The master timer was videoed clicking over from 99 to 100, there being enough digits allowed for this. The sub-timer, which was programmed to allow effluent release for two hours at specified intervals (coinciding with the tides) took the 100 and trucated it to 10; in this case 1910. The result would be that the control system released effluent for 90 years plus 2 hours. That would tend to never stop releasing stuff. Interesting problem for such systems. Severl facilites using such systems have a certain amount of holding capacity, usually one or two missed releases at best. In other words, they can miss two tides, then the plant shuts down or the effluent is released regardless of tide time. Or of course the holding tank overflows into the facility. Dave Hall dhall@enteract.com

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