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2. November 2012 TechConnect Genius Webinar
Getting Started With and Using the MSG Instruction
Tim Kraynik
Senior Technical Support Engineer
November 15, 2012

3. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

4. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

5. MSG Instruction What is MSG, Network & Protocol
What is a MSG Instruction?
What is a Network?
What is a Protocol?

6. MSG Instruction Protocols
Examples of network protocols supported by Allen-Bradley controllers are:
DF1 Full Duplex
DH485
DH+
Ethernet
DF1 Half Duplex
DF1 Radio Modem
Modbus RTU (Master or Slave)
Modbus TCP/IP
DeviceNet
DNP3 Slave
Profibus
Note: Not all AB controllers support all of the above protocols

7. MSG Instruction What Can Be Done (Local Connections)
The MSG instruction can be used to pass data from controller to another:
The MSG instruction can be used to pass data from one controller family to another:
The MSG instruction is not limited to a particular controller family!

8. MSG Instruction What Can Be Done (Advanced)
The MSG instruction can be used to pass data from one Controller Family to another even if they are on different networks (a bridge is required):

9. MSG Instruction What Other Things Can We Do
Other things that can be accomplished with the MSG instruction:
Share data to/from a third party controllers (CIP Generic)
Get status information from processor or I/O modules

10. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

11. Understanding MSG Instruction
To understand how a MSG instruction functions it is important that one has a good understanding of:
When the processor communicates
How the MSG instruction functions
What a buffer is and how many are available
Each controller family does operate differently
FRN has increased and improved things from rev to rev

12. Understanding MSG Instruction When do the Processors Communicate
Operating cycle consists of a series of operations that are performed sequentially and repeated.
Logix scan is more complex and interrupts for IO at specified RPI settings

13. Understanding MSG Instruction Logix System Overhead Time Slice
Logix controllers processor time can be adjusted to allow more time for MSG communications

14. Understanding MSG Instruction How the MSG Functions
The MSG needs to be scanned true in ladder logic
The MSG will take a snapshot of the data to send (on a MSG write) and move the snapshot into the communications buffer
MSG EN (Enable) bit turns on to indcate that is has been triggered
MSG DN (Done) bit turns on to indicate a successful transmission
MSG ER (Error) bit turns on to indicate something went wrong

15. Understanding MSG Instruction How the MSG Functions
Once in the Active Buffer the data will transmit over a period of scans until complete.
Several or hundreds of processor scans may complete by the time the MSG is completed.
The number of scans is dependent upon:
The amount of data (how many elements/words)
The type of network in use The baud rate that is selected
Other traffic on the network The scan time of the controller
Other MSG’s that are in the buffers

16. Understanding MSG Instruction SLC & ML Buffers
The SLC/MicroLogix controllers have 14 buffers:
4 Active Buffers
If not full – MSG request is placed in one of the Active Buffers
This is where the actual MSG is processed and transmitted from
10 Backup Queue/Buffers
If Active buffer is full – MSG request is placed into a backup queue
MSG data waits in the backup queue until the Active buffer is opened
MSG’s in the backup queue are handled on a first come first serve basis

17. Understanding MSG Instruction Logix Buffers
Logix5000 Messages have buffers for unconnected messages and for cached/connected messages.
Knowledgebase Answer How to increase unconnected buffers

18. Understanding MSG Instruction Logix Memory Estimate
Estimated Data and Logic Memory

19. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

20. Understanding MSG Setup
MSG from a MicroLogix 1400 to a SLC5/05
MSG from a CompactLogix L27 to a MicroLogix1400

21. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

22. Communications Path

23. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

24. Troubleshooting a MSG instruction
Common error codes:
7h Target nodes does not respond DF1 ACK/NAK timeout DLE ENQ
16#001 Extended Error Code 16#0000_0204 – connection failure
No cable/wrong cable
Wrong node address
MSG timeout value expired before any response form target
10h Target nodes cannot respond because of incorrect parameters
16#1000 – Illegal command from local processor
The target device does not have the targeted data file defined in its program
The number of elements is out of the boundaries

25. Troubleshooting a MSG instruction
Check the Following (Checklist):
Confirm that the DN bit is triggering
Confirm that cabling is good
Confirm both devices are set to the same exact protocol
Confirm all communication settings match
Confirm that the destination device node address
Confirm the destination target file exist & is large enough
Capture the error code from the message instruction
95% of all MSG calls are a result of one of or a combination of the above
If you still are having trouble?

26. Agenda 1. What is a MSG instruction?
2. How does a MSG instruction work?
3. How do I set up a MSG?
4. How do I set the communications path?
5. How do I troubleshoot a MSG instruction?
6. Where can I get help with the MSG instruction?

27. Where can I get help with the MSG instruction?
Check the Programming Reference Manual for detailed list of all errors.
Search the Rockwell Automation Support Center for a tech note.
Search for MSG Example and include the target and destination
Include the network media
Contact Technical Support Start with the group that supports the controller that initiates the MSG.
Telephone
Chat
SAQ

28. Questions?