R
Hi all.
I am using a Siemens S5-115U PLC with a 941CPU, and I decided to use a TD 390 text display to display error messages coming in from a plant. It is the first time that I used the TD 390, and I wonder if anyone can please help me with some information.
At first I wrote my whole program (Consisting out of 4 PB's of about 33 segments each, as well as OB1,21,22). Then I put in the error conditions in PB5. It worked, but the strange thing is that as soon as a error code was to be displayed, it took about ten seconds before the message was displayed, and then it also showed on the screen for only about 2 seconds. I then swopped PB1 and PB5, and the problem was solved. The error messages was displayed immediately, and they stayed on the screen until the error condition went false. Can anyone tell me why this is so ? (Note : The scan time on the TD was set to 2 seconds).
I am using a Siemens S5-115U PLC with a 941CPU, and I decided to use a TD 390 text display to display error messages coming in from a plant. It is the first time that I used the TD 390, and I wonder if anyone can please help me with some information.
At first I wrote my whole program (Consisting out of 4 PB's of about 33 segments each, as well as OB1,21,22). Then I put in the error conditions in PB5. It worked, but the strange thing is that as soon as a error code was to be displayed, it took about ten seconds before the message was displayed, and then it also showed on the screen for only about 2 seconds. I then swopped PB1 and PB5, and the problem was solved. The error messages was displayed immediately, and they stayed on the screen until the error condition went false. Can anyone tell me why this is so ? (Note : The scan time on the TD was set to 2 seconds).