IEC FBD Bit Logic Instructions

Bit Logic

2 Input AND Box

2 Input OR Box

Positive Transition

Negative Transition


Output Immediate

Set Immediate (N bits)

Reset Immediate (N bits)

Set (1 bit)

Reset (1 bit)

Set Dominant Bistable

Reset Dominant Bistable


A red diamond by each SIMATIC style instruction identifies an extension to the standard IEC 1131-3 instruction set.