Sequence control blocks are used to implement general-purpose sequences at the loop equipment level, such as safety interlock sequences and process monitoring sequences. The blocks are coded in decision table format and logic chart format using logical operators. Switch instrument, timer, counter, code input/output, and various other blocks are prepared as sequence auxiliary blocks.

Sequence Tables	Logic Chart

Calculation blocks assist regulatory and sequence control functions, and perform general-purpose calculations on analog signals and contact (logic) signals.