Jump to content

Jazz - Master ad Slave Modbus


Recommended Posts

Hello,

Short description of our installation:

Basis on JZ10-11-T40 with JZ-RS4 RS232/485 we controll humidty and temperature in 5 rooms.

In each is installed modbus transducer working as Slave.

We can program set points and all necessery data trough keypad, but client want to extend system.

He wants to connect it to Scada, InTouch, and now starts problem.

Is it possibile at all? As Scada is always Master and Jazz has to be Master for reading data from transducer.

We have idea to set Jazz for reading data as Master every 30 sec ( done by timer ) and them back for Slave awating for Scada to read data from Jazz.

Can we got an answer if something like this is possibile?

Link to comment
Share on other sites

Hi Vojtech,

In the matter you describe Jazz has even advantage compared with Vision. In Jazz, when you set the port as Modbus, you "automatically" set it as Slave. Then, you perfomr Modbus command and it acts as Master.

Based on that, there is no special need to switch between Master and Slave there.

Where can be the conflict? If the SCADA is perfming communication with Jazz, it can be busy to perform Master command.

Workaround idea:

When switching between Master and Slave, to change ID of the unit. In this case SCADA will not connect and Jazz needs ot be free to connect to its Slave.

In this case the SCADA will loose communication for some times.

The idea is not checked here - it's just idea.

If you're going to try it, please let me know the result.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...