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Old February 21st, 2003, 08:39 AM   #1

locus is offline
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Hi! No output on plc

hi everybody,i badly need your help.I have a machine equipped with a siemen plc, the problem is that i don't get any output. I have checked the machine securities and the power supply to the output card is good and i have all the necessary inputs.please help me out, any suggestion is the most welcome.Than you
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Old February 21st, 2003, 08:45 AM   #2
Mike Williams
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Are you saying none of the outputs are working?

Is the plc in run mode?

What voltage output card do you have?

Do you have access to the program via software?

What siemens system are you speaking of?
Mike Williams
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Old February 21st, 2003, 08:47 AM   #3
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Is the PLC in RUN? If it isn't in Run mode you won't get outputs even though you have the correct inputs.
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Old February 21st, 2003, 09:05 AM   #4

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Cool Siemens Step 5 or Step7?

Which plc Siemens do you use? Step 5 or Step7?
Do you config. the cpu ..power supply..I/O address by software in a correct or proper module or not?
Also,see the run see Run..RUN P Selector Sw. if you use Step7
Please check ..hardwire and software..anything else see the Siemens manual..
If not...try to call Siemens Distributor near you.

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Old February 21st, 2003, 09:36 AM   #5
Tom Jenkins
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There are a variety of things that can cause the symptom you describe. For successful troubleshotting, you need to follow a step by step process, working backwards from your field device to the program. Here are a few steps - many more will be obvious to you as you proceed on your specific system. DO NOT jump around - start at one point and work the cause/effect back one step at a time.

1) Do you have voltage at the field device (relay, motor starter, whatever)? Is it operational if you jumper the control voltage directly to it?

2) Do you have continuity from the device all the way back to the PLC output?

3) Do you have voltage at the PLC output common?

4) Is the LED indicating PLC output is on lit? (yuo may need to force the output to test this.)

5) Does the output wiring have voltage when it is lit?

6) If these are DC devices are your polarities right? Are your sink/source connections consistent?

7) In the logic, from the programming software, does the rung with the output show that the output is on (after you remove the force, of course)

etc. etc. etc.

If you follow a logical procedure, take good notes, and examine each cause/effect in turn you will always get the answer!
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Old February 24th, 2003, 09:05 AM   #6
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did you check the small button fuse?
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Old February 25th, 2003, 06:40 AM   #7
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Is that block being called?

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