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jose7771

hmi or dcs as master using cpu 226 s7

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hi , i am using s7 cpu 226 with hmi touch panel 270 10" my plc will be integerated to dcs using modbus protocol so what i have to use as master as dcs or hmi and which ports has to be congigured as what please help me regards jose

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Typically the HMI would be the master. In your case, I would expect the DCS to also work as a master. The Modbus master is the device that issues the read/write commands. All the slave can do is respond to the messeages from a master. Are you using a different port on the S7-226 for each device or are they both connected to one port?

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sir with ref to ur reply,i am using 2 ports seperately 1 hmi 2 dcs i will be connecting my laptop to one of the port and hmi to other port, after testing the sequence i will be configure the port connected to the laptop to be connected to dcs regards jose

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The device that initiates the request to read/write info is always te master. So your DCS and your HMI would both be masters.

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