This means that we need something to trigger the message instruction periodically. Keep in mind that the message instruction will execute one time per rung transition. Writing the logicĪt last, we will write the logic in Node 11 for SLC-500 Messaging. Leave the length at 1, because the control block will expand as needed when we write the message instruction. I’m going to create this as integer file 91. This will keep track of the instruction’s status and error conditions. This data file will be the control block for the message instruction to operate. First, we’ll create N90 in the same manner that we did for Node 10, except the name and description will be a bit different.Īlso, I’m going to create another Integer file. There are a couple data files we need to create. Set up the data files and logic in Node 11
Msg instruction rslogix 500 download#
Your logic will usually populate this data table with meaningful information.įinally, I’ll download the changes to node 10. This will prove that our data transfer is working if we see the same values in the target processor. Next, I’ll open the N90 data file and populate this with random data. To demonstrate, I’m just creating a new file. Keep in mind that we could have chosen any data file. Right click Data files, and create a new Data file. In node 10, let’s create data file N90, which is an Integer file. The 5/04 at Node 11 will execute the read command at periodic intervals. We are using a 5/04 processor in this example on DH+. Especially on slower networks, such as DH+, we need to always keep the amount of data we transfer in mind.įor this example, we’ll read 5 elements of data from N90:0 at node 10 into N90:0 at Node 11.
However, from a bandwidth point of view, we might only want to write data to another processor when a change has occurred. When the troubleshooter is tracing a bit, they will come across the message instruction, and can trace where the data is coming from. It’s important to realize that from a troubleshooting point of view, it’s better to read data, than to write data.
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