Programmable controllers: which element can be used with a TI510 FC (function controller) in typical ladder/sequence applications?

Introduction / Context:
Legacy Texas Instruments TI510 function controllers and similar PLCs support a set of standard timing and sequencing elements for industrial control. One classic element is the drum timer, used to step through a predefined sequence of outputs over time—much like a mechanical cam drum, but implemented electronically.

Given Data / Assumptions:

• Context is PLC/FC ladder logic and sequence control.
• We seek an element name that appears in such controllers’ instruction sets.
• Other options appear to be distractors rather than standard control elements.

Concept / Approach:
A drum timer provides indexed timing steps that energize outputs according to a schedule, enabling repeatable multi-stage operations (wash/fill/heating cycles, packaging sequences). It abstracts multi-timer logic into a single configurable unit, simplifying sequence design compared to wiring many individual timers. “Metronome” and “cymbal timer” are not PLC instruction names. “Flashing light” is an output device, not a controller element or function block.

Step-by-Step Solution:
List common PLC timing/sequence elements: on-delay, off-delay, retentive timers, counters, drum/cam timers.Match these to the options.Select “Drum timer.”

Verification / Alternative check:
Classic PLC manuals include drum/cam sequencer functions, confirming their use in older and modern platforms for stepwise control.

Why Other Options Are Wrong:
(b) and (c) are not standard PLC terms. (d) is a field device; while a drum timer can control a flashing light, the light itself is not a PLC function element. (e) Not applicable since a valid element exists.

Common Pitfalls:
Overusing discrete timers instead of a sequencer, leading to brittle logic; failing to document drum step timing and interlocks.

Final Answer:
Drum timer