5/18/2014 9:22 PM | |
Joined: 4/13/2008 Last visit: 4/5/2021 Posts: 71 Rating: (9) |
Your point is clear :) Protect single channel inputs against short circuits and cross circuits! In general, Sick uses 100 ms as minimum and 3 s as maximum period in Sick FlexiSoft Safe controller for monitoring single channel operator request for failsafe control (page 215). I use it same way outside safety controller, just to be sure that it isn't any unauthorised access. In my 19-years Industrial Automation career I've learned to force apropriate action from operator instead of giving him any option (ex. double click hazard). Failsafe solutions means also a foolproof...:) |
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