Which statement describes how an OTE can influence a subsequent XIC input instruction?

Which statement describes how an OTE can influence a subsequent XIC input instruction?

• A. A true OTE on one rung can be used as the input for an XIC on the next rung to become true
• B. OTE cannot influence XIC
• C. XIC can only be controlled by the same rung's input
• D. OTE controls XIO but not XIC

Answer: (A)

In ladder logic, energizing an OTE creates a stored state (a memory bit) that can be read by later rungs. When a rung successfully completes to an OTE, its associated bit becomes true, and a subsequent rung can use an XIC (Examine If Closed) contact referencing that bit to also evaluate to true. This lets you build hold-in or latch behavior, where an initial input sets the memory bit and a following rung uses that bit to keep the circuit energized even if the original input is released. For example, a start input can energize an OTE, setting a memory bit. The next rung can have XIC on that memory bit to drive the output coil. If a reset occurs to clear the memory bit, the XIC in the later rung will no longer be true and the output will turn off. This demonstrates how an OTE influences a subsequent XIC by providing a condition that can be read later in the program. The idea isn’t that the OTE only affects the same rung or that it controls XIO exclusively; it’s about creating a remembered state that downstream rungs can observe with XIC.

In ladder logic, energizing an OTE creates a stored state (a memory bit) that can be read by later rungs. When a rung successfully completes to an OTE, its associated bit becomes true, and a subsequent rung can use an XIC (Examine If Closed) contact referencing that bit to also evaluate to true. This lets you build hold-in or latch behavior, where an initial input sets the memory bit and a following rung uses that bit to keep the circuit energized even if the original input is released.

For example, a start input can energize an OTE, setting a memory bit. The next rung can have XIC on that memory bit to drive the output coil. If a reset occurs to clear the memory bit, the XIC in the later rung will no longer be true and the output will turn off. This demonstrates how an OTE influences a subsequent XIC by providing a condition that can be read later in the program.

The idea isn’t that the OTE only affects the same rung or that it controls XIO exclusively; it’s about creating a remembered state that downstream rungs can observe with XIC.