engMoH

configuring communication

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Posted (edited)

i have a plc Modicon M340 , HMI hmigxu3512x and VSD Altivar 71, and i only allowed to use serial MODBUS port in plc, now the VSD is a slave and is controlled with plc as a master how can i add the HMI to this configuration?? i know that this model of HMI can be slave but then how it will give orders to PLC to start stop etc.. and if PLC is slave how it will control the VSD??

Edited by engMoH

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no problem -  M340 must be master and ATV71 and HMI are slaves 

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hey @Quant 

i found this useful link https://www.schneider-electric.com/en/faqs/FA213155/ 

but as i thought all examples was mentioned is that plc writing on HMI, the questions is : if HMI slave and plc is master can i use buttons in HMI to switch on devices connected to plc ? and not jusr reading values from plc ?

i will go with try and error anyway but i wanted to know if this was possible before

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