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The CPU seems can't see the IO module

8/20/2010 6:39 PM	Rate (0)
tulinho Posts: 16 Rating: (1)	Hi Guys, Well, until yesterday my PLC was working well, but today after I tried to program and test a PID controller block the CPU and the modules seems can't communicate anymore.I still can monitor the user program online and the leds of the input signals turn on when I get a input, but there's no output signal. I am a undergraduate student and I need a expert help.
tulinho Posts: 16 Rating: (1)
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8/20/2010 7:00 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 12/27/2025 Posts: 12474 Rating: (2722)	Hello tulinho; No system messages, no error LEDs on the CPU or on the DO modules when you try to access the outputs? What module of CPU are you using, what modules (part numbers) are giving you trouble? Do these output modules need separate 24 V power (check the L/M- connections on the front connector)? Hope this helps, Daniel Chartier

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8/20/2010 7:29 PM	Rate (0)
tulinho Posts: 16 Rating: (1)	Daniel, I have a CPU 315f 2 pn/dp and I use the digital module 323 DI16/DO16. well, I think it's not a front connector problem cause I use the 24 V power from the power suply and the input channels are working. I mean, the module's LED indicates there is a input signal when I take one, but I can't see it when I'm monitoring the program. And, so, there's no output signal. Oh, and there's no error LED blinking on the CPU Tulinho
tulinho Posts: 16 Rating: (1)
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8/20/2010 8:39 PM	Rate (0)
tulinho Posts: 16 Rating: (1)	Hello guys, I discorvered that my problem is from software, but I still can't solve this. I transferred all the modules and their buses to another CPU and tested with another program and it works. If someone have some idea about that, please help me.
tulinho Posts: 16 Rating: (1)
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8/20/2010 8:47 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 12/27/2025 Posts: 12474 Rating: (2722)	Hello tulinho; Have you checked if there were any configuration differences between the 2 projects, different address ranges for this module, for example? Is this a 6ES7-323-1BL00-0AA0 module? Hope this helps, Daniel Chartier

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8/20/2010 8:53 PM	Rate (0)
tulinho Posts: 16 Rating: (1)	Mr. chartier, I will check if there's any diference and come back here. And yes, it is a6ES7-323-1BL00-0AA0 module.
tulinho Posts: 16 Rating: (1)
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8/20/2010 9:48 PM	Rate (0)
tulinho Posts: 16 Rating: (1)	Mr. Chartier, I finally solved my problem. I don't know how, but arised diferences between the online and offline configuration. I'm sorry for take your time, but thank you anyway. Tulinho
tulinho Posts: 16 Rating: (1)
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This contribution was helpful to 1 thankful Users dchartier

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