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Analog ouput redudancy

Created by: Jazz_M at: 3/11/2010 10:33 AM (5 Replies)

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3/11/2010 10:33 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	I have two redudant analog output cards, i have connected one channel of each card via a diode plate (Refer attachment ). My question is that when i connect the two o/p adds up & and i get double mA. Is there any settings that have to be done in step7....or there is any other settings Please advise... Attachment AO_REDU.pdf (294 Downloads)
	Jazz
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3/22/2010 12:54 AM	Rate (0)
JullioC Posts: 16 Rating: (1)	hello I heven't used this function, but i think you must use a special FB that is on the library
JullioC Posts: 16 Rating: (1)
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3/28/2010 10:22 PM	Rate (0)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Hello Tagolover, The redundant I/O's are only supported by S7-400H. For this job, you should read chapter 10 carefully inS7-400H manual. You will find explanation of how redundant I/Os work and then you will have to read the help of FC450, FC451, FB450, FB451,FB452 & FB453 that can be found under Libraries>Redundant IO in SIMATIC Manager. If you like to create your ownblocks then you will have to configure the analog outputs as 0..20mA instead of 4..20mA and calculate the output value of each redundant channel. The total current output is the summation of the currentof the 2 channels. At 4 mA, each channel should be contributing with 2 mA and at 20mA, each channel should give 10mA. Best regards. H-H

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3/29/2010 12:46 PM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi all Thank you for the reply , I shall check it out and revert back Thank u
	Jazz
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8/4/2010 4:37 PM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi H-H Well i have programed the Red_io in the hardware configuration and the used the library block as you said. But the analog output is not getting halfed at the card. For eg i give 50 % as output then i get 50% in 1 channel and the other cards 1 channel and the added result is 100% (20mA). I have programed the Fb450, fb451 in OB1. My question is the blocks tells me that the corresponding DB is not available. If i check it in the hardware of the CPU , in redudacny tab, i have redudant IO DB. When reading the manual , i find that the DB will be created automaticaly by the CPU, but it has not created. I am getting the the error code as W#16#8005 which means that the db is not available. What should i do for this
	Jazz
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8/18/2010 10:03 PM	Rate (0)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Hello Tagolover, I'm sorry for my late reply. The management data blocks are created by FC450 (RED_INIT) which should be invoked in OB72, OB100 (for warm restart) and OB102 (for cold restart). Make sure you have used FC450 in the above mentioned OBs and observe the return value for each call of the FC. Best regards. H-H

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