1756-RM093 Safety Signature is REQUIRED for SIL 3
Safety input modules used for dual-channel devices must be configured as single, not equivalent or complementary if used with GuardLogix Safety Application Instructions. If configured for equivalent or complementary, discrepency faults at the safety instruction are masked by the input module.
GuardLogix Safety Application Instructions provide all dual channel functionality necessary for PLd (Cat. 3) or PLe (Cat. 4) safety functions
The safety task does not begin executing until the primary controller and safety partner have established their control partnership and the coordinated system time (CST) is synchronized. However, standard tasks begin executing as soon as the controller transitions to Run mode
Aliasing between standard and safety tags is prohibited in safety applications.
REAL datatype is not allowed in any tag, structure or udt in safety programs
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