Home » Categories » Protocols » Modbus |
How do I monitor the health of coms to my slaves when the module is a Master? |
Article Number: 290 | Rating: 1/5 from 6 votes | Last Updated: Fri, Jan 18, 2008 at 12:00 AM |
When the MCM driver is setup to be a Modbus master, the firmware will maintain a list of status codes. Each number in the "master commman error" list corresponds to a single message in the master command list. The position of a given status code matches the position of the associated message in the list. This list can be accessed using hyperterminal and connecting the computer to the configuration or debug port on the module. From the main menu, look for the "command error list". Any non-zero value in this list indicates that there is a communications error. Since each message in the list is limited to communications with one slave, then the status of a command in the list will indicate that a particular slave may be failing. Note that this list can be brought into the ladder logic by using the "command error pointer" to place this table in the read register area of the module. |
Attachments (0)
![]()
There are no attachments for this article.
|
Comments
![]()
There are no comments for this article. Be the first to post a comment.
|
How do I read/write Modbus binary data?
Viewed 1 times since Wed, Nov 29, 2006
Why is the bit or coil level data incorrect?
Viewed 1 times since Tue, Nov 28, 2006
How do I enter a Modbus address of 40001 or higher in the DevAddress command field of my MVI56-MCM?
Viewed 1 times since Tue, Nov 28, 2006
If I am reading the value from ProSoft 4x register, and it represents a digital input or digital output, how is the value stored?
Viewed 1 times since Tue, Nov 28, 2006
I have multiple Modbus masters that need to communicate with 1 or more Modbus serial (RTU) slave devices. What product should be used??
Viewed 1 times since Tue, Jan 23, 2007
My RX light is on solid, what might that indicate?
Viewed 1 times since Fri, Jul 17, 2015
Why are my PLX gateway modbus serial commands not executing despite being enabled?
Viewed 1 times since Wed, Aug 12, 2015
What's the difference between Modbus ASCII and Modbus RTU?
Viewed 1 times since Wed, Mar 19, 2008
I have limited or no experience with Modbus. How can I find out more about the protocol and command structure?
Viewed 1 times since Tue, Nov 28, 2006
Read Commands from my Modbus Master to a ProSoft MCM Slave are working but Write Commands are failing. How do I fix this?
Viewed 1 times since Fri, Feb 8, 2008
|