Forcing functions should not be used:

A) with retentive outputs.
B) with nonretentive outputs.
C) with immediate I/O instructions.
D) without consideration for any potential unsafe effects.

Forcing Functions

A technique in control systems and simulation where output or internal states are set to specific values, bypassing the normal operation of the system.

Retentive Outputs

Outputs in a PLC that maintain their state (on or off) even after the PLC is powered down or restarted.

Unsafe Effects

Consequences or outcomes of a process, operation, or design that can potentially lead to harm or danger to people, systems, or the environment.