Allen-Bradley GuardPLC 1753, Safety Reference Manual

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16 Publication 1753-RM002C-EN-P - September 2008
Chapter 1 Safety Concept for GuardPLC Controllers and GuardPLC I/O
The safety functions, consisting of a safety loop (input, processor,
output, and communication between GuardPLC modules), fulfill the
above requirements in any combination. These requirements are also
met by the GuardPLC distributed I/O modules.
Safety requirements, including PFD and PFH, for the DeviceNet Safety
Scanner are in
Chapter 5 .
Safety requirements, including PFD and PFH, for the DeviceNet Safety
I/O are in
Chapter 6 .
GuardPLC I/O
SIL-Certified
Module IEC 61508 MTTF (in years) PFD PFH
1753-IB16
(1)
(1)
The PFD and PFH data is based on a functional verification test interval of 10 years.
45.02 3.684285E-05 2.772601E-09
1753-OB16
(1) 15.22 3.625669E-05 3.902687E-09
1753-IB20XOB8
(1)
20.48 5.107536E-05 4.247003E-09
1753-IB8XOB8
(1) 19.02 4.603845E-05 6.581646E-09
1753-IB16XOB8
(1)
12.38 6.655234E-05 6.189071E-09
1753-IF8XOF4
(1) 35.01 8.575442E-05 5.159597E-09
1753-OW8
(2)
(2)
The PFD and PFH data is based on a functional verification test interval of 3 years.
34.16 2.240516E-05 1.730251E-09