I’m trying to set a 3 single bits in my PLC (Allen-Bradley CompactLogix 1769-L18ER Cpu). To do this, I started using 3 different Allen-Bradley Write data blocks and 3 Device Command each. The device commands are set by 3 different trigger buttons… Then, I discover that it doesnt work like that (because when I press any button, the command set all the 3 bits at the same time).
Is there a way to send individual commands to set different bits individually? how to do that?
Welcome to the Losant forums, we’re happy you’re here!
Would you be able to send along some screenshots of your workflows and Allen-Bradley write node configuration?
Also, a common mistake is that when sending multiple different device commands to a single device you may need to use a Switch Node after the Device command trigger to switch on the name of the command so you know which command is sent.
Yes, you’re damn right, I did not use a Switch Node.
I was taking a look over Switch Nodes documentation, It’s a kind of hard to me to understand all those web design and IT languages (my school is the school of automation, machines, ladder etc). I did not undertand how the syntax works.
What I know is: my commands have a name. And thats it. I really dont know where and how to proceed.
The Switch Template field is usually a string template for a payload path that you would like to switch based on what the value is.
For example, let’s say I am sending a number on my payload with the path data.number and that number can be either 0, 1, or 2. My switch node configuration would look like:
So, in your case, you’re switching on the device command name, which should be at the payload path data.name. So, your switch template would be something like {{data.name}} and then your Case Template options would be the values that the name could be.
I would recommend you check out some of our Losant University videos, they do a great job of introducing some of these concepts in Losant. You can also read more about switch statements online.
