01

As programmers, especially those working with PLCs, what we fear the most is not the difficult problems themselves.

It’s those “not difficult at all, but you just can’t get past” small bugs.

You’ve checked the logic five times, scanned the variables ten times, monitored for a whole day, yet the signal lights are still wrong, the motor won’t turn, and the alarms won’t sound. You’re anxious, frustrated, squatting on-site—technicians, leaders, operators, all watching you like you’re on trial, no one says it outright, but the air is thick with the unspoken question, “Why haven’t you fixed it yet?”

You start to doubt your life.

Where did it go wrong?

No variables are missing, the order is correct, I’ve checked each subroutine, the jump logic and timer delays have all been scanned,the monitored variables are more familiar than your paycheck, yet when you press the start button, bang, it crashes.

At that moment, your brain feels like a pot of burnt porridge, unable to stir, and it’s still annoying to smell.

02

But have you noticed,miracles often happen when you take a break.

You step out of the workshop, the wind blows, and your mind feels a bit clearer; you’re in the restroom for two minutes, not looking at diagrams, not thinking about code—suddenly, it pops into your head:

“Could it be that the initial position isn’t being cleared?”

“Did I forget to reset the completion signal of the previous action?”

“The delay was written in the outer layer, no wonder it didn’t wait long enough!”

You switch from restroom mode back to online status, not even bothering to tighten your pants, rushing back to the workshop,and with a flurry of operations, you solve the problem a little, feeling a sense of accomplishment for the whole day.

You know you haven’t become smarter.

You just,escaped the mental shackles of that deadlock.

03

This is the real difficulty of PLC programming—not the syntax, nor the structure, but “what to do when you’re stuck”.

Being stuck is not scary. What’s scary is sitting next to the problem, staring, staring, staring, thinking that the more you look, the closer you get to the truth, but in reality, the more confused and anxious you become,and you end up being “more mechanical than the machine”.

You think you’re debugging, but in fact, you’re in a “self-imposed dilemma”.

Your thinking has no looseness, your eyes have no distance.

Your brain has long signaled: insufficient memory, restart to take effect.

But you don’t believe it, insisting on using “persistence” to solve a “direction error” problem.

You think “just one more look will reveal it”, but you’ve already entered a “blind spot” of not seeing.

It’s like someone searching for their glasses for an afternoon, only to find out,the glasses were on their head.

04

So, the first principle when the program is stuck is not to keep grinding away, but to—stop.

You need to learn to be like an old craftsman, when mistakes happen, it’s not about being anxious, it’s about frowning; it’s not about randomly clicking, it’s about stepping away.

They have a calmness that comes from years of experience; when they make a mistake, they don’t panic, they don’t fuss, they light a cigarette, take a round, and suddenly find the problem.

It’s not that they are lucky, it’s that their minds are cool.

It’s not that you can’t do it, it’s that you want to “solve it immediately” too much.

You think this is called focus, but in fact, it’s being swept away by emotions; you think this is called responsibility, but in fact, it’s self-pulling.

I know an old PLC technician who has been in the field for twenty years.

He said something I will never forget:

“Problems are simple; the complex part is you.”

You think this is motivational talk?It’s cold water.

Real experts actually slow down more and more.

05

We in automation are used to seeing equipment “stuck” and “malfunctioning”, but what’s most easily overlooked is the “logical confusion” and “abnormal state” of our own inner system.

You’re not unable to fix the machine; you’ve just forgotten to fix yourself.

If you’re distracted, don’t write code; if your brain is overloaded, don’t stare at the diagrams; if your eyes are blurry, don’t check the signals.

No matter how rigorous the program is, it can’t compete with an unclear mind.

No matter how perfect the logic is, it can’t withstand the amplifier of anxiety.

You need to know: inspiration doesn’t come when you’re racking your brain.

It appears quietly when you “completely let go”.

Just like those few seconds of taking a break, your body and mind unload, the current flows, and your thinking briefly regains its original “calm”.

Perhaps, each of us working with PLCs should remember this truth:

The best way to debug may not be to stare a little longer, but to stand up and step away for a bit.

You think you’re wasting time; in fact, you’re gaining clarity.

You think you’re avoiding it; in fact, you’re recharging.