As the PLC (LOGO) is a controller without safety-related properties - it can also be said that the standard PLC is "not a well-tried component" - it may not be connected downstream of the safety relay (e.g. PNOZ). In this type of circuit, the safe signal loses its reliability after the PLC.
Pilz Australia Safe Automation
Unit 1, 12-14 Miles Street
Mulgrave, Melbourne, Victoria 3170
Australia
Telephone: +61 3 9560 0621 / 1300 723 334
E-Mail: safety@pilz.com.au
Telephone: +61 3 9560 0621
E-Mail: techsupport@pilz.com.au