July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/ 0750656794-CH010.3D – 111 – [111–115/5]
19.6.2004 9:10PM
10
Safety
Inanyindustrialdesign,safetymustbeafirstpriorityinthatthedesigner(s)musttake
allreasonablestepstoensureapersonorpersonscannotbeharmedinanywaywhilst
thesystemisbeingoperated.
TherearenowEuropeanMachinerySafetyStandards,whichalsoincludethecontrol
systemsofthemachinery.Thesecanbesummarisedasfollows:
1.Allemergencycircuitssuchasemergencystopbuttonsandsafetyguardswitches
mustbehardwiredandnotdependonsoftware,i.e.PLCsorelectroniclogic
gates.
2.Adesigner(s)mustcarryoutariskassessmentprocedure.Inadditiontheprocedure
mustbedocumentedforpossibleinspectionatanytime.
3.Implementanychangestothedesigntolimitanyrisk,asfaraspossible.
4.Ensure
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