FF function blocks support all of these modes:
• OOS (Out Of Service) – All function blocks are required to support this mode, where the block freezes its output at the last calculated value and attaches a “Bad” status value
• Man (Manual) – the output of the block is fixed at a value determined by the technician, with a “Good” status value attached
• Auto (Automatic) – the function block processes information normally
• Cas (Cascade) – the function block processes information normally
• Iman (Initialization Manual) – the output of the block is fixed at its last calculated value, due to the output signal path being incomplete
• LO (Local Override) – the output of the block is fixed at its last calculated value, due to a detected fault condition within the device
• RCas (Remote Cascade) – the function block processes information normally based on a setpoint sent from a remote source to the block’s RCas In input
• ROut (Remote Output) – the function block passes data to its output sent from a remote source to the block’s ROut In input