shooter

it is a warning to tell you the variable is rewritten somewhere else in your program, if you have any pointers directing to it, they will be pointing wrong place. as i do not use any pointers (i hate them) no problems with them. if the var is not pointed just carry on.

this is canadian software, i love it. the error says a macro can have only one entry and one exit.

as 880 is also limited in memory, however it is possible to store data. i would write log files for each test apart to a PC. The codesys software can do this for you (it is in wago software) yes you can use internal webserver, however i would use a separate PC for the customers, and not a PLC as the software would be very tricky to make.

You can not use the programming communication as gsm output. you will have to setup a separate communication with drivers. have a look at www.oscat.de for this. it looks german but the software is in english.

find a plc with some lloyds certificate like wago they go down cold. do not use lcd display but old fashioned led that will go down. if only one reading one display if more two displays one with the code and one with value.

i would go for this moeller thing as you can do the programming very easy and cheap. it has drivers on board for your lights. else it can be done in 5 volt with some ttl circuits, however this has to be made special. otherwise you colud use this analog signal as a serial output and have a small plc do the conversion for you. just use standard serial type only slower. another bustype is iic this can be put into a single ic and it has 8 outputs, however it does need two outputs from the plc, (or 4 signal values. i work a lot with wago so cheap and versatile is possible.

use a very simple 555 timer and you will get a nice time puls out of it. works in big variety of resistors and capacitors. watch maximum voltage of capacitor please. the output of the 55 is put direct into plc which will give a pulstime. and you can make a very fast good/bad out of it. it is the most used ic ever.