Edit Ladder in Online mode

[Shaun]

I have used the UniStream in 2 applications and I am a fan. I would like to know if you can edit your ladder and do a download while the PLC is still running. 

[ORSO2001]

Hi Shaun,

if you are "online" with your PLC you can only modify the value of the tags (set/reset bit, insert a number or change a string)...not the ladder flow/logic.

to modify the ladder flow/logic you must be "offline" and after you have to download the program...if you modify only logic and not HMI you can select the "download logic only"...after the compilation of the program the system, berfore the phisically download, will ask about a reset or not of the actual value of the tags(retained or not is the same)...I never do this with a system in working mode, I have always set the system in "off", so I don't know what really happen with the phisical output.