Modbus TCP/IP - Mutiple Masters to One Slave.

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Thread Starter

Ghulam Rana

We are working on an application in which Multiple Modbus TCP/IP masters require to talk to one slave. Please share your experience if somebody has done it. Thanks
 
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Automationtechie

We have implemented a system with multiple Modbus TCP masters in a building automation project. It really depends on what type of devices you are using and how often you are polling. Our project, we used several of these mini HMIs which were only periodically polling our slaves to control lights and doors. The HMIs were configured a Modbus TCP masters and we had one in each entrance

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What type of devices are you using? How often are you polling?
 
My experience is that it depends on the slave's ability to handle multiple masters.

Some lower end devices just can't handle multiple requests, particularly in close sequence. Several models of single loop PID controllers come to mind. These are uP devices, not a full blown workstation running apps.
 
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