All Questions
20
questions
1
vote
1
answer
72
views
Runtime display for last 24 hours
I'm working on a BRX PLC connected to a C-More HMI. I'm using Do-More Designer to write ladder code. I'm looking for ladder logic that will give me the runtime of a circulating pump in the last 24 ...
- 45
1
vote
0
answers
697
views
How to convert this ladder logic to Sequential Function Chart
I am doing an assignment where I need to create an office management system that takes care of security, lighting, and heating on its own. It is required for us to make it in the sequential function ...
- 129
0
votes
2
answers
122
views
How to setup two different inputs to one output
Good morning. I am hoping to get some insight on a setup I am working on.
Current setup:
24V system. An area sensor when flagged by hand does two things.
First, it sends a signal to the network that ...
0
votes
2
answers
213
views
I keep getting this error but don't know why "Invalid input. - input required but omitted"
Please help me by checking if my program is correct or giving the correct ladder program. I keep getting "Invalid input. - input required but omitted" this error for all the variables in ...
1
vote
1
answer
130
views
Delay in turning on two different start buttons in Star/Delta starter on PLC
Currently I'm working on a university project based on Star/Delta Starter on PLC.
I wrote program using LD, that switches on the circuit with a motor rotating forward (of course with star/delta ...
1
vote
1
answer
153
views
What is the difference between these two ladder logic diagrams?
First ladder logic diagram:
Second ladder logic diagram:
I am trying to implement a toggle switch. On the rising edge of "Change", it should toggle "ToggleThis".
I thought the ...
- 447
0
votes
2
answers
13k
views
TIA portal - failed to establish a connection
I'm using TIA portal siemens v15.1 for my project when i tried to upload the code to the plc this error pops up. Appreciate anyone can help me in this issue
- 11
0
votes
1
answer
120
views
STEP7 MICROWIN PLC Ladder Diagram
I draw like the first figure in the program, but when I save the program it automatically becomes the second shape. Do the two mean the same thing?
- 3
0
votes
1
answer
835
views
TLP LogixPro PLC Simulator
This is my second day of learning PLC online. I am doing a simple ladder diagram, and I came up with the following diagram:
The process I have in mind is as follows:
As the switch is closed, the ...
- 59
0
votes
1
answer
77
views
what is the logic behind these ladder lines
I have a ladder diagram for timing porpose.(keyence KV-24DR)
some instructions are repeated many times but I dont understand what are these for.
can anybody help me?
the confusing thing is that the ...
- 65
1
vote
2
answers
787
views
Storage bit in OSF and best way to detect falling edge
I was looking for a way to detect falling edges and I encounter two ways:
|--XIO---ONS------------OTE--|
and
|--XIC------------------OSF--|
|--OSF.OB---------------OTE--|
My colleagues told me ...
3
votes
1
answer
599
views
What does the % symbol mean on plc addresses?
I've seen contacts assigned with a % symbol on ladder diagrams and plc structured text. For example a normally open start button would be %I1.02 and a coil would be %Q5.3
I understand the I and Q is ...
- 347
0
votes
2
answers
279
views
PLC ladder-logic equation stabilization
I have worked with PLCs in the past. Now, I'm working with devices called 'vital-logic controllers'. The vital logic controllers are similar to PLCs, but I'm wondering about a subtlety of how the ...
- 163
1
vote
2
answers
1k
views
How to create a Retentive/Accumulative Timer from On-Delay/Off-Delay Timers
According to this post , all timers can be created from just the On-Delay Timer (TON).
At the end of the post, after showing how to create an Off-Delay Timer, an On+Off-Delay Timer, and a Flasher ...
- 123
-1
votes
2
answers
785
views
Understanding ladder PLC logic
I'm trying to understand the flow logic of ladder language. Is it sequential like C/C++? "i don't think so"
Particular case: I've been trying to something very simple but cant make it happen as I ...
- 499