KB Home \| Advanced Search \| News \| Ask Question
ProSoft Knowledge Base

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.

Custom Fields

Attachments (0)

Attachments

There are no attachments for this article.

Comments

Comments

There are no comments for this article. Be the first to post a comment.

Related Articles

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

How do you detect the individual Slave failure?

Viewed 1 times since Wed, Nov 29, 2006

Why are my PLX gateway modbus serial commands not executing despite being enabled?

Viewed 1 times since Wed, Aug 12, 2015

What Modbus address would we need to put into the MODSIM32 simulator if we specified on the MVI56-MCM device address to 8680HEX (-31104 decimal) when the MVI56-mcm is the slave?

Viewed 1 times since Tue, Nov 28, 2006

Defining the Slave ID when issuing Modbus Broadcast write commands

Viewed 1 times since Tue, Nov 28, 2006

Can Modbus support redundant masters?

Viewed 1 times since Tue, Nov 28, 2006

I am trying to use a ProSoft Modbus solution to send/receive data to a MSA Ultima X gas dectection system with Modbus interface and am having problems. How can I resolve this issue?

Viewed 1 times since Thu, Apr 24, 2008

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

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

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