Scotty,
95% of my work is AB, but I think Modicon Concept is the best programming tool after using AB for so many years.
I recently did a large project, which I developed some fantastic Function blocks which made the job soo much easier, and are reusable on any future projects. It was my first...
I have not heard of this "5 rung logic", but I use a similar concept, which is simple to follow, but is considerably more than 5 rungs.
The main idea is to standardise your logic for any given project. It is important to have a standard tags and memory allocation that is simple to interface...
I haven't heard that term in a while. That would be Allen Bradley PLC5/15 or PLC5/25 if my memory is correct.
I have not looked at this isue for at least 10 years, but I will explain what I remember.
This is mainly to do with the configuration of the Remote IO port.
Scanner Mode: The idea is...
Having spoken with people at Rockwell on this very subject, it seems they are never going to have online editing ability for micrologix range.
They are more keen to push the CompactLogix range as the slightly more expensive better alternative with online editing ability.
Having used both, I...
Yep, Not an issue.
If you select EDIT->Verify Project, they will be both the same.
The number next to SOURCE B is all that matters. The other number is just the last value.
If you are working online, you can not change constants in micrologix.
Go offline, edit the value next to SOURCE B...
SLC system would be very expensive, and not all that fantastic. It looks like a reasonabley large system. Too large to place IO in the computer.
I would be inclined to go for a control logix over the SLC, as the mathematical abilities are way more advanced. It also has advanced interupt...
I don't think it is possible.
First up, I am not a siemens expert.
A company I do a lot of Allen Bradley programming for recently set up an interface between their Allen Bradley and Seimens system.
They used a lone S7 processor on ethernet to the siemens network to act as an interface. This...
If you want robust control, use a robust industrial system, not a PC. What happens when your PC locks up, or crashes?? How can you possibly rely on a PC.
A PC is OK for SCADA, as it is only supervisory, does no actual control. So when it locks up (which happens regularly) the PLC continues to...
No matter how much work I do on the prosoft modules, I still get confused when using them. Your problem sounds specific to your case, so would probable require Prosoft Support to examine your logic. I would contact my Prosoft distributor.
Point taken jlada, but I do have a solution to the comparison instruction.
I use one intruction (2 power STEP) to a word. This then gives a word where each bit represents the step number, ie bit 0 is on for step 0 or if sequence is stopped. Bit 5 will be on for step 5.
So I don't actually use...
I would agree with FrancisL. I have been programming PLC's for 20 years. I have been down that path of using subroutines like steps in a sequence. In the end, it becomes more confusing and the result is generally not as good.
The simplest method (put simply) is to move values into a STEP...
The length is the number of destination elements. So if the destination is a word, than the length refers to words. If the destination is a timer, than the 1 length = 3 words.
In your particular example, it is words.
On every project I program hour run meters for every motor. Using the real time clock is not the way to do it.
The simple way, is use the RTC:0.sec/0 which is the LSB for seconds. Each time it changes produce a pulse. This is a reliable 1 second pulse. You could also use S:4 if you don't have...
rubna,
That will work to a 1761-NET-AIC, which is why I suggested it.
It will not work to a 1747-AIC, as it has an RJ45 RS485 to DH485 interface. Therefore you need to convert RS232 D9, to RS485 RJ45.
Changing the config to 485 is still RS232, but in DH485 protocol. You still need to...
