plc project: pin and plastic part machine

carrma

Member
Join Date
Jul 2002
Posts
7
how to sinchronize two mode. which is manual mode and auto mode. because my final project allow the user choose either manual mode or auto mode to start the machine in the same ladder.
 
First, you (and/or your client) need to define just what "MANUAL MODE" means. See THIS THREAD for some some of the problems.

If you decide that Manual means complete control (within safeties), then just combine the modes:

MANUAL MAN_START MAN_STOP SAFETY RUN
---+---| |---+----| |----+----|/|-----+----| |------( )
| | | |
| | RUN | |
| +----| |----+ |
| |
| AUTO AUTO_RUN |
+----| |--------| |----------------+



The AUTO_RUN bit is some output from your sequencer that tells the device to run.
The SAFETY bit is all the conditions that are required for the device not to cause injury to someone or something. This is not a substitute for hard-wired safeties, just a backup. (It also makes sure that when the hard-wared safeties are restored, that the device doesn't start up unexpectedly because the seal was still made)

Make sure that the sequence dosn't advance while a device is in Manual mode (unless you really, really want it to. If the sequence is doing several things at once, it can get lost quite easily in manual mode.

This sort of thing must be designed from the first rung - it cannot be grafted onto a project at the end, or you will wind up with spagetti code.
 
If your meaning of auto mode is continious automatic cycling and manual mode is one cycle for one push of the button, which I am assuming to be the case. I would do something like below.




Auto
Select Auto
-----1 1----------------------------------------------( )

Cycle Cycle
Start Complete RUN
-----1 1---------1/1----------------------------------( )
1 1
1 1
1 Auto 1
1-----1 1-----1




I have to figure out how to post code in here, this was painful!
 

Similar Topics

Hello everyone, I have an RSLogix5000 project which is running live in the factory but I need to make some changes to the logic. I want to test...
Replies
0
Views
1,097
Hi I have a question regarding managing a plc project. I don't program PLCs in as my background but I am an experienced software developer...
Replies
1
Views
776
On my laptop I have an old.acd file with important comments in it. The file was modified and downloaded to my AB-1756 long time ago. Later a few...
Replies
5
Views
1,952
Greetings from all the way down here in New Zealand:-) I have a challenge for you all..... I have a need for a PLC to run a Doser pump to pump...
Replies
34
Views
11,046
I have HMI MP277 10" Touch and need to connect it with a S7-300 PLC on Profibus NETWORK - I am using TIA Portal V13 and tried to use the Device...
Replies
1
Views
1,004
Back
Top Bottom