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I would like read from a power meter(lumel nd10 )L1 L2....... phase and current

11/17/2012 12:42 PM	Rate (0)
neni Posts: 3 Rating: (0)	Hi smiffy, I would like read from a power meter(lumel nd10 )L1 L2....... phase and current and in the manual of the lumel have a table and say that from address 7000 we can read L1 phase voltage ( 16-bit register address) with mb_master block (s7-1200 cpu) but i get a code 8381 (function code not supported).How we use the function code and how we send this function code as part of the request(poll) Thank you
neni Posts: 3 Rating: (0)	Last edited by: O_Moderator at: 11/20/2012 10:33 AM new subject after splitting from /tf/WW/en/Posts/43381#top
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12/4/2012 4:32 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 4/15/2025 Posts: 1560 Rating: (540)	The device is a modbus RTU slave. So you will require a modbus RTU master implementation on the S7 side. You will need either a CP341 or a CP441 CP card and the modbus master software / dongle. Read my write up on the modbus protocol (/tf/WW/en/Posts/66876#top) in the tips area of the communications forum. This will give you the basics of modbus protocol and contains links to the software and dongles (ordering details). The values are held as IEE754 32-bit floating point values (reals). So each value is held in 2 consecutive registers. You will need to convert this back to floating point data internally. This is described very nicely in this thread:- /tf/WW/en/Posts/62789
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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