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1 PLC 2011 ( 23 )5 20 PLC Safety PLC WG PLC Safety PLC WG Ve r. 2011 5 20 2011 6 20 (1) 1 ..1 2 ..2 3 ..4 4 PLC ..8 ..8 ..8 ..8 PLC.

2 8 5 PLC ..9 ..9 (EDM ) ..10 6 PL ..11 ..11 PL (SRP/CS PL ) ..11 7 ..14 ..14 ..15 ..18 / ..21 / ..24 ..27 3 ..30 / ..34 ..38 ..42 ..45 1 PLC 1 EMC Safety PLC WG 2009 5 25 IEC 62061:2005 (JIS B 9961.)

3 2008) ISO 13849-1:2006 (PL) PLC PLC PL ISO 13849-1:2006 PLC PLC PL PLC 2 2 ISO 12100-1:2003 (JIS B 9700-1:2004) Safety of machinery - Basic concepts general principles for design -- Part 1.

4 Basic terminology methodology 1 ISO 12100-2:2003 (JIS B 9700-2:2004) Safety of machinery - Basic concepts general principles for design -- Part 2: Technical principles 2 ISO 14121-1:2007 (JIS ) Safety of machinery - Risk assessment -- Part 1: Principles 1 ISO 13849-1:2006 (JIS ) Safety of machinery - Safety-related parts of control systems -- Part 1: General principles for design 1 ISO 13849-2:2003 (JIS ) Safety of machinery - Safety-related parts of control systems -- Part 2: Validation 2 IEC 61508 Ed.

5 :2010 (JIS ) Functional safety of electrical/electronic/programmable electronic safety-related systems / / IEC 61800-5-2:2007 (JIS ) Adjustable speed electrical power drive systems - Part 5-2: Safety requirements Functional 5-2 IEC 62061:2005 (JIS B 9961:2008) Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems IEC 60204-1:2005 (JIS B 9960-1:2008) Safety of machinery -- Electrical equipment of machines -- Part 1: General requirements 1 3 BGIA Report 2/2008e (BGIA 2/2008 ) Functional safety of machine controls.

6 -Application of ISO 13849- BGIA2008 ISO13849-1:2006 PL SISTEMA ( ) JEMA 7206 ( 09-03) 21 -2 ( 22 3 ) 22 4 3 FS-PLC (a Functional Safety PLC PLC) IEC 61508 PLC FS-PLC PLC (Functional Safety) IEC 61508-4:2010 E/E/PE EUC EUC / / (E/E/PE) IEC 61508 (EUC: Equipment Under Control) PLC 4 SRP/CS (Safety-Related Parts of a Control System) PLC SRECS (Safety Related Electrical Control System ) IEC 62061:2005 (JIS B 9961.)

7 2008) SRP/CS SRP/CS SRP/CS SRP/CS SRP/CS PL (Performance Level) EN954-1 ISO 13849-1:1999(JIS B 9705-1:2000) B, 1 4 PLa PLe PL 6 PLr (required Performance Level) PLr ISO 13849-1:2006 A PL ISO 13849-1:2006 PLr IEC 62061:2005 IEC 61508 :2010 ISO 13849-1:2006 4 PL SIL 5 Safety block diagram ( ) SRP/CS SRP/CS PL SRP/CS 3 SRP/CS PL ( 5 ) B10d 10% [.]

8 ] 10% MTTFd ISO 13849-1 C MTTFd=150 B10d ISO 13849-1, C C B10d IGBT PLC B10d MTTFd (expectation of the Mean Time To dangerous Failure) d B10d MTTFd ISO 13849-1:2006 MTTFd=B10d/( nop) nop=dop hop 3,600[s/h]/tcycle dop / [d/y] hop / [h/d] tcycle [s/ ] MTTFd ISO 13849-1:2006 C SN29500 MIL-HDBK-217F PLC MTTFd DCavg (average of Diagnostic Coverage) [ :none/medium/high] SRP/CS DC( ) DC SRP/CS PL ISO 13849-1:2006 DC IEC 61508-4.

9 2010 DC= DD/ Dtotal 6 DD Dtotal ( DD+ DU ) CCF (Common Cause Failure) [ ] SRP/CS IEC 61508-6:2010 D ISO 13849-1:2006 F F. 1 CCF 2 3 4 SRP/CS 65 PFHd (Probability of dangerous Failure per Hour) 1 SRP/CS( SRECS) 1 ISO 13849-1:20006 3 K probability of a dangerous failure per hour IEC 61508 PFH IEC 62061 PFHd SRP/CS PL PFHd Stop category ( ) IEC 60204-1:2005 (JIS B 9960-1.)

10 2008) 3 0 1 2 0 1 2 EDM (External Device Monitoring) PLC PLC PLC EDM EDM 7 Unexpected/Unintended start-up ( / ) ISO 12100-1:2003 (JIS B 9700-1:2005) / 8 4 PLC PLC PL( PLe ) PLe DCavg 99 PLC 2 PL PLC PLC ISO 13849-1.