jose7771 Posted January 22, 2005 Report Posted January 22, 2005 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 Quote
Crossbow Posted January 23, 2005 Report Posted January 23, 2005 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? Quote
jose7771 Posted January 24, 2005 Author Report Posted January 24, 2005 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 Quote
Crossbow Posted January 26, 2005 Report Posted January 26, 2005 The device that initiates the request to read/write info is always te master. So your DCS and your HMI would both be masters. Quote
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