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s7-200

2/18/2013 6:17 PM	Rate (0)
ppn Posts: 1 Rating: (0)	i have a dobut about add_real instruction ie, i have two setpoint in HMT (micro177) the adress are VD3&VD4 and configured for real.but when i entering the value in hmi only one value is reading in PLC.can you please guide how i can make it right .
ppn Posts: 1 Rating: (0)
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2/18/2013 6:22 PM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 1/10/2026 Posts: 10247 Rating: (1183)	Try it with VD4 and VD8. Best regards, Hristo Mihalev

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2/19/2013 5:03 AM	Rate (1)
Nelliyan randy Posts: 461 Rating: (29)	Hi , The reason why UMENCHO told u to try vd4 & vd8 is vd means double word . 4 byte = 1 double word., see the 200 memory addressing for more informations. Hope it helps Regards, Nelliyan.G
Nelliyan randy Posts: 461 Rating: (29)
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