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stickman47

Accessing D2-250-1 CPU

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Gents, I have an small DL-205 application using a D2-250-1 CPU. Yesterday the CPU stopped runing, no fault light, no Run light and no CPU light, just Power. I purchased a replacement CPU and got the same thing. I am using Direct Logic through port1 and cannot establish communication. I don't know if I should go power supply or backplane next. Any input would be appreciated..

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Turn off power to the rack Remove all cards from the rack Turn on power to the rack, verify 24VDC at terminals on the left One at a time: - Turn off power - Add in one card - Turn on power - re-measure the 24 vdc I bet you'll find either a defective rack or one of the cards bringing the 24VDC down.

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I did as suggested but still no PLC. I have the 24v but it looks like I lost the 5v. I am ordering a rew base. Thanks for the help.

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