Which instruction passes true rung continuity when the value of Source A is greater than Source B?

The instruction that passes true rung continuity when the value of Source A is greater than Source B is the GRT instruction. This instruction, which stands for "Greater Than," evaluates a comparison between two values. When Source A exceeds Source B in value, the GRT instruction evaluates to true, allowing the rung containing this instruction to execute successfully.

This characteristic is essential for conditional logic in programming, where different actions can be performed based on the outcome of such comparisons. For example, in a control system scenario, the evaluation of whether one variable exceeds another can dictate operation sequences, alarms, or feedback mechanisms based on specific thresholds.

In contrast, other options like LES (Less Than), MUL (Multiply), and ADD (Add) serve different purposes in programming. The LES instruction checks for conditions where Source A is less than Source B, while MUL and ADD perform mathematical operations rather than logical comparisons. These functions do not determine rung continuity in the context of comparing values directly.