The C-more panel is a SLAVE when communicating via Allen-Bradley EtherNet/IP Server ( Generic IO Messaging) ( Control/CompactLogix). The following information applies for Allen-Bradley PLCs for the purpose of setting up Explicit Messaging via EtherNet/IP. It is thus advised to program all the MSG instructions within the same routine.Allen-Bradley Generic EtherNet/IP Explicit Messaging Setup This comes into play when your control system changes and you now need to go back and redirect all the paths. The second item is the fact that an MSG instruction is difficult to track. In other words, the data transfer speed may be impacted by multiple factors thus making it somewhat unreliable. The first one is that this method of sending & receiving data isn’t deterministic. There are a few things you should keep in mind when using MSG instructions. In the tutorial above, we’ve demonstrated all the steps required for creating this connection between a MicroLogix 1100 and a CompactLogix L24ER PLCs. The MSG instruction provides an easy way to establish communication between two Allen Bradley PLCs. If the path becomes a problem, you may add the secondary PLC into the I/O Tree of the one doing the messaging. You need to make sure that the instruction is set to read/write correctly and that the path is defined exactly as it’s established in the real world. Step 4 – Verify the configuration of your instruction. Verify that the data types match as well. Step 3 – Make sure that the tags are in place and are correctly specified on both ends. Connect your laptop to the same network & use the “ping x.x.x.x” command to check connectivity to both PLCs. Step 2 – Make sure that your hardware is on the same network and IP Addresses allow them to communicate. This can be easily checked by looking at the. Step 1 – Make sure that the ladder is executing the instruction.
Just like with anything else, it’s important to know how o troubleshoot. Over the years, I’ve seen many reasons for which an MSG Instruction will fail. Testing and Troubleshooting the MSG Instruction Moreover, if the data is critical, it’s recommended to use alternative methods, such as Produced/Consumed tags, to get the data across. There’s no solid requirement here, but it’s definitely recommended not to send data too frequently if it isn’t critical. Keep in mind that you may increase or decrease the setpoint of the timer in order to execute the MSG more or less frequently. By using a GRT Instruction, we can trigger the MSG Instruction once per cycle of our timer. This allows us to build a structure which will constantly increment the timer and reset once it reaches the peak. In order to accomplish this, we’re going to leverage a simple repetitive timer through a TON Instruction, paired with an XIO Instruction based on the completion. Our first step is to establish a ladder logic structure in order to accommodate the MSG instruction. MSG Instruction Programming in Ladder Logic Studio 5000 Furthermore, the same instruction would work between any RSLogix/Studio 5000 and RSLogix 500 based Programmable Logic Controllers. Both of these are heavily utilized in the current manufacturing environments and provide an excellent testing platform. This instruction would be utilized within the RSLogix 5000 or Studio 5000 programming environments on an Allen Bradley PLC and Write or Read data from a different PLC.įor the purpose of this tutorial, we will be covering the communication between a MicroLogix 1100 PLC and a CompactLogix L24ER PLC. One of the simplest ways to pass data between two controllers would be through the use of the MSG instruction. However, in the current manufacturing environments, it’s an absolute must. Sending data between two Programmable Logic Controllers can pose a challenge.
0 kommentar(er)
