MSG instructions Flashcards
Processors may _____ or _____ to another processor
Read/Write
Reading data and writing data are both easy to troubleshoot (true/false)
False. Writing data is much harder to troubleshoot than reading.
What is the main purpose of the MSG instruction?
To allow plcs to read/write to each other.
What type of datatype is the MSG instruction?
Message type
Don’t use message tags for more than one MSG instruction (t/f)
True
When is the MSG instruction executed?
When the rung-in condition is true
If communicating with a logix processor, what type of communication method should be used?
CIP data table read/CIP data table write
What is the source element of the MSG instruction for CIP data table read?
The first tag in the target PLC you want to read
The source element is usually an ______
Array
The number of elements in the MSG instruction is referring to what?
How many elements of the array you want to read.
What is the destination element in the MSG instruction for CIP data table read?
The first tag in the local PLC you want to move the data into
The path contains all of the necessary information required for the PLC to connect to the target PLC. The structure varies depending on the type of processor you are connecting to. For example, LocalENB, 2, 192.168.5.243, 1, 0. (ControlLogix to ControlLogix)
What is the meaning of all elements in this path?
LocalENB - The local ethernet card
2 - Ethernet/IP port
192.168.5.243 - The IP address of the target PLC
1 - communications across the backplane
0 - indicates the slot of the processor
The path contains all of the necessary information required for the PLC to connect to the target PLC. The structure varies depending on the type of processor you are connecting to. For example, LocalENB, 2, 192.168.5.243. (ControlLogix to CompactLogix)
What is the meaning of all elements in this path?
LocalENB - The name of the ethernet card in the I/O configuration
2 - Ethernet/IP
192.168.5.243 - The IP address of target PLC
The path contains all of the necessary information required for the PLC to connect to the target PLC. The structure varies depending on the type of processor you are connecting to. For example, 2, 192.168.5.243. (CompactLogix to CompactLogix)
What is the meaning of all elements in this path?
2 - ethernet/ip
192.168.5.243 - IP address of the other PLC
How many times will the MSG instruction execute?
Only 1 time everytime the rung-in condition becomes true
