Questions tagged [plc]
Programmable Logic Controller
63
questions with no upvoted or accepted answers
3
votes
0
answers
76
views
How does online code editing work in a PLC?
Some PLCs, such as Allen Bradley CompactLogix, allow "online" changes to be made to the running program on the PLC. These changes are (almost) instantly applied and don't require the PLC to ...
- 2,696
2
votes
4
answers
189
views
Interfacing Delta PLC and Arduino (Logic Signals)
I am trying to connect a Delta PLC (DVP-10SX) to an Arduino UNO. What I'm trying to achieve here is to be able to exchange Logic signals between both the PLC which has a logic level of 0-24V and ...
- 21
2
votes
0
answers
164
views
Best approach to program a PLC using dbc file? (CAN communication)
I'm pretty new using CAN Communication but I need to program a Phoenix Contact PLC in Structured Text. The PLC should communicate with a motor that uses CANOpen protocol. The only resource I have is ...
- 21
2
votes
0
answers
337
views
No current changes using INA219 to reading industrial sensor
I intended to use the INA219 chip to read the 4-20 mA current loop of the industrial sensor for the automation project. the sensor voltage is 12 V, my first schematic was as follows:
The ground of ...
- 343
1
vote
0
answers
26
views
Arrangement of isolated variable DC input
I design isolated DC input for industrial applications that can possibly work from 12 to 24 V.
I add a 5.1 V Zener for over-voltage protection, a capacitor for filtering, and TVS for surge production.
...
- 343
1
vote
0
answers
14
views
Data availability on a HART device network configured for multi-drop mode
We have 2 flow meters on an equipment installation that are HART-capable. As they are installed today, configuring these devices in multi-drop mode would be much easier than running additional wire ...
- 73
1
vote
2
answers
37
views
Does it make sense to look into the voltage and current of the power supply for my PLC controller?
The power supply of the PLC controller I am working with (X20PS9600 to be precise) has internal readings into software for the current and voltage it is delivering. I am not sure about the purpose of ...
- 858
1
vote
2
answers
75
views
How to Drive a 50uA Panel Meter with a PLC Running 24v Inverted PWM Signal
Full disclosure, I am not an engineer of any kind. Just an electronics enthusiast.
I have a Barth 850 micro PLC that needs to operate at 24v, and has one PWM output. I also have a 50uA panel meter ...
- 11
1
vote
0
answers
330
views
How does the incremental form of the PID controller work?
I have a question regarding the features of the so called incremental (velocity) form
of the PID controller. As far as I understand this form in correct manner it can be
described via this pseudocode
<...
- 1,113
1
vote
0
answers
63
views
Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
I work in manufacturing with Toshiba extrusion machines which are controlled by PLCs. Our management wants to add a ...
- 19
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
1
vote
0
answers
113
views
SPI data lines look identical, but results are different, how is that possible?
I have a golden sample system which consists of 2 devices communicating via SPI.
I swap one of the devices and bit bang the SPI to make it similar to the golden sample.
However the bit banged device ...
- 413
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
0
answers
153
views
EC and pH sensor in plc automation
I am working with automation using pH and EC sensors. Both are of 4-20mA communication standard. When at a time single sensor is placed in liquid(in 1000 litre tank) then everything works fine (...
1
vote
0
answers
66
views
Why hasn't the industry standardized sink/source according to sensor/plc component type?
I know quite enough to understand how sink/source works when connecting sensors and PLCs, as well as how it works concerning the electronics components and circuit diagrams. What I don't understand is ...
- 367