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Results tagged with plc
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user 26526
Programmable Logic Controller
1
vote
What do the letters and numbers mean in the addresses of Allen-Bradley PLCs?
B=Boolean (Bit)
T=Timer
C=Counter
R=Control (used as storage for certain instructions)
N=Integer (16-bit)
F=Float (floating point real number)
(There are other data types as well, depending on your PLC …
- 680
1
vote
Accepted
Converting 7-Segment Display output to binary
The best way to do this, as @Decapod mentioned in the comments, is to do this in the PLC logic, editing the program to use 4 new output points. … (The Click PLC from AutomationDirect is one example.) …
- 680
1
vote
Can I use an analog input for a discrete signal field device on the A-B Micro820?
To elaborate on @AltAir's comment, the Micro820 controller you have has 12 inputs, 4 of which (I-00 - I-03) can be used as either 0-10v analog inputs or 24VDC digital inputs.
There are a few consider …
- 680
3
votes
Can I transmit data over RJ12 to a PC from a PLC?
The 6P6C (RJ12) ports on the Click PLC are RS-232 serial ports. The 6P6C port on your laptop is a modem, which connects to a telephone line. …
- 680
0
votes
Interfacing Arduino and Siemen's PLC S71200
Most PLC inputs are either 24 VDC or 120 VAC. Either way, you won't be able to wire a pin directly from the Arduino (5 VDC output) to the PLC input. You'll need to add a relay. …
- 680
1
vote
Accepted
Ladder diagram, variation of Latch and Lock
If you are looking for a beginner tutorial or simulator for PLCs, there are quite a few to choose from by searching Google:
plc tutorial
plc simulator …
- 680
1
vote
Accepted
Storage bit in OSF and best way to detect falling edge
This is for Rockwell/Allen-Bradley PLCs, which use all of those instructions.
For those who don't know:
XIC = Examine If Closed. This is a normally open contact. --| |--
XIO = Examine If Open. …
- 680
1
vote
Pictures of different adapters, trying to understand how they work (PLC to PC communication)
Test the USB-Serial adapter with something other than your PLC to confirm that it is working correctly. …
- 680
3
votes
Accepted
A very basic question about PLC field input switches
The normally-open and normally-closed contact instructions you see in the logic do not correspond in any way to what type of switch is wired to the input. When writing the logic, you choose the instru …
- 680
1
vote
Accepted
What is the difference between these two ladder logic diagrams?
In your first program, it works as you intend when ToggleThis starts at 0. You set Change to 1, and in Rung 2, because ChangePrevious is 0, ToggleThis gets latched to 1. Rung 3 sets ChangePrevious to …
- 680
0
votes
Interfacing Delta PLC and Arduino (Logic Signals)
One way to send logic signals between devices of different logic voltages is to use optoisolators (also called optocouplers). When specifying an optoisolator, you need to look at the range of input an …
- 680
1
vote
Accepted
Runtime display for last 24 hours
On the Do-More PLC, the relevant instructions are FIFOLOAD and FIFOUNLOAD. …
- 680
2
votes
DIN rail terminal block resistor
Through-hole components are pretty easy to connect to standard DIN-rail mounted terminal blocks. Either screw or spring-clamp terminals would be fine. You can use 3- or 4-terminal blocks to have enou …
- 680
1
vote
Potential Free contact for VFD using Relay
You could wire it into a PLC input so you would know when the drive is faulted. …
- 680