Flex727

Check the battery.

No, you're trying to do math with a compare function block. That won't work. You need to create two new tags using the addition and subtraction function blocks, then use those tags in the compares.

Looks like you're creating a thermostat for your pool temperature. The way I would do it is to create a tag for the temperature setpoint (this will be the value displayed on the HMI that can be modified), then create two more tags that you add and subtract half the variance you allow around the setpoint. Place these tags in your two compare blocks for the 'B' value. If you want to have a fractional degree variation, you will need to multiply everything by 10 so that you can have an implied decimal to work with.

In my case, no Power-Up in SI 253.

I happened to be working on another project using 9.8.96 and I was able to change SI 253 easily while online. I think the fact that SI 253 is locked in my PLC is the problem, but I can't find anything that locks or unlocks that operand.

I cannot change SI 253, either by changing directly while online nor by adding a Store Direct ladder rung. It is stuck on 1111 no matter what I do. Perhaps this is the root of the problem.

V1210-T20BJ, S/N: W7P52G10005, Ethernet card installed, PLC battery appears good. I don't know the year of manufacture, but it's probably 4-5 years old. Yes, I am able to go online with the PLC (see screen cap above that shows MI 4000 has 2222 for its value). The application appears to be intact through power cycle as you can see the Start-Up Display flash briefly before the PLC goes into Stop Mode with the No INFO Password error. Yes, the screen cap above indicates the value and I just went into INFO Mode (the password for INFO Mode is still '1111') and checked the value of MI 4000 there and it shows 2222. Interesting note, I can Reset from the VisiLogic Connection menu that does reset the PLC and results in the same error, but when I click the Run button it comes back with "STATUS: Conflict Run/Stop on the PLC screen, but remains in Stop Mode.. It looks to me like the Set Info Password FB did not execute, but it is in rung 2 of the Main Routine. [Edit to add that I added an Increment FB to the end of the rung and the rung definitely executes.]

I'm just getting started with 9.9.01 as well and I'm also having the problem. Here is what I did: Successfully installed VisiLogic 9.9.01 (as administrator). Run 9.9.01 (as administrator). Opened project file previously saved with 9.8.96. Added the necessary startups for INFO Password and PCOM Password. Successfully updated the firmware on the PLC. Downloaded the updated project. "Stop reason: No INFO Password" What to do?

Which Samba? And do you have the source .vlp file?

Moved to the VisiLogic forum. Unitronics calls it "Uploading" when going from the PLC to the PC. In order to upload a project, the programmer must specifically allow that when downloading the project from the PC to the PLC. The default setting is to NOT allow that. However, there's no harm in trying. When connected to the PLC with VisiLogic, select Upload from the Connection menu (or simply Ctrl U). It will tell you if Upload is available.

I was assuming Adan needed help getting the Snap-In module connected to the back of the PLC.

What PLC model do you have?

Thanks for this! By the way, in case you didn't notice, you can right-click on the file and select "Configure" to change certain aspects of the pipes.

I think it will make little difference, but a 10-bit 4-20mA analog input is 204-1023, not 205.

Moved to the Vision forum so that the clever users can find the post most easily.