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AO problem

Created by: SeSa_eng at: 4/25/2012 5:18 PM (12 Replies)

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4/25/2012 5:18 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	hi; can anybody help me why i can read analog output voltage using sm1234. i use unscale block (norm and scale_x) i write pqw128 10,20,30 ext.. no voltage i see. i am sure ao cards settings is true, voltage, cyclic PI, adress 128. connection is true, 24vdc to L+ and 0 to M

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4/25/2012 5:23 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 2/7/2023 Posts: 13083 Rating: (2125)	SeSa_eng hi; can anybody help me why i can read analog output voltage using sm1234. i use unscale block (norm and scale_x) i write pqw128 10,20,30 ext.. no voltage i see. i am sure ao cards settings is true, voltage, cyclic PI, adress 128. connection is true, 24vdc to L+ and 0 to M Ok, let me see if I have this right. User Units are say 0-100.0 (as in %). Let's say user units (command source) is in MW100 and has the 0.0 to 100.0 values. NORM of MW100 to MW104. Now MW104 has normalized command scaled 0.0-1.0. Ok, now we scale it for the analog output. SCALE MW104 to MW128 with scale output values 0..27648. Now if you change MW100 (command source) to 100%, you should see 10.0V at the analog output. Is this not working?
	science guy
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4/25/2012 5:35 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	not working. i see my output changing 0...27648 (i set mw 100 manuel) but if i measure it multimeter no voltage..

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4/25/2012 5:38 PM	Rate (0)
Gorp Posts: 89 Rating: (16)	First you have to find out if your hardware is working so forget the norm and scale for this moment. Just move a value between 0 and 27648 to PQW128 and measure the output voltage of the module.
Gorp Posts: 89 Rating: (16)
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4/25/2012 5:41 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 2/7/2023 Posts: 13083 Rating: (2125)	SeSa_eng hi; can anybody help me why i can read analog output voltage using sm1234. i use unscale block (norm and scale_x) i write pqw128 10,20,30 ext.. no voltage i see. i am sure ao cards settings is true, voltage, cyclic PI, adress 128. connection is true, 24vdc to L+ and 0 to M Is the module configured in the plc properly and all lights green and program running? How about the power wiring to the analog module itself? Does it have external 24V/COM power? If you disconnect the load, do you suddenly get voltage at the analog output terminals?
	science guy
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4/25/2012 5:54 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	yes i did it, i m changing direct pqw128..

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4/25/2012 5:56 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	all leds is green, program is running. external ps is supplying cpu and AI/AO card, but i didnt understand when i unload AO reading 10v, reaction to stop?

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4/25/2012 5:59 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	huggy_d1 SeSa_eng hi; can anybody help me why i can read analog output voltage using sm1234. i use unscale block (norm and scale_x) i write pqw128 10,20,30 ext.. no voltage i see. i am sure ao cards settings is true, voltage, cyclic PI, adress 128. connection is true, 24vdc to L+ and 0 to M Is the module configured in the plc properly and all lights green and program running? How about the power wiring to the analog module itself? Does it have external 24V/COM power? If you disconnect the load, do you suddenly get voltage at the analog output terminals? and also im checking IO fault via ob82 then no fault

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4/25/2012 6:12 PM	Rate (0)
SeSa_eng Advanced Member Joined: 11/8/2009 Last visit: 10/5/2022 Posts: 31 Rating: (1)	huggy_d1 SeSa_eng hi; can anybody help me why i can read analog output voltage using sm1234. i use unscale block (norm and scale_x) i write pqw128 10,20,30 ext.. no voltage i see. i am sure ao cards settings is true, voltage, cyclic PI, adress 128. connection is true, 24vdc to L+ and 0 to M Is the module configured in the plc properly and all lights green and program running? How about the power wiring to the analog module itself? Does it have external 24V/COM power? If you disconnect the load, do you suddenly get voltage at the analog output terminals? if i check the Enable poer supply diagnostic properties of the AI/AO modul all leds flashing red. what does it mean?

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4/25/2012 6:21 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 2/7/2023 Posts: 13083 Rating: (2125)	Maybe the polarity is backwards or the wiring is on the wrong set of terminal blocks. It is easy to get the swapped. Look carefully on the module for which terminal blocks are associated with each set of wiring on the module.
	science guy
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