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STEP 5 Older CPU 115u Problem

Created by: adamix at: 6/17/2014 3:41 PM (13 Replies)

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6/17/2014 3:41 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	Hello i have an old CPU115u system with few I/O cards. Got it connected, but no matter what i do i cant get it to RUN. It always flashes error RED. I believe i need a IM or termination resistor connected. Does anyone know exact pins on the IM connector where i can connect the resistor? Should i use standard 120Ohms? Thanks Adam

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6/17/2014 3:57 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 5/27/2023 Posts: 2321 Rating: (303)	adamix Hello i have an old CPU115u system with few I/O cards. Got it connected, but no matter what i do i cant get it to RUN. It always flashes error RED. I believe i need a IM or termination resistor connected. Does anyone know exact pins on the IM connector where i can connect the resistor? Should i use standard 120Ohms? Thanks Adam Hello Adam The information provided by you is insufficient for anyone to be able to assist you. Please provide the MLFB ( Order Nos ) of the CPU , Rack amd IM that you are referring to. Also if it was an existing syste, how did the problem start ? Cheers Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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6/17/2014 4:13 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	Navnag adamix Hello i have an old CPU115u system with few I/O cards. Got it connected, but no matter what i do i cant get it to RUN. It always flashes error RED. I believe i need a IM or termination resistor connected. Does anyone know exact pins on the IM connector where i can connect the resistor? Should i use standard 120Ohms? Thanks Adam Hello Adam The information provided by you is insufficient for anyone to be able to assist you. Please provide the MLFB ( Order Nos ) of the CPU , Rack amd IM that you are referring to. Also if it was an existing syste, how did the problem start ? Cheers Navnag Hello Navnag Cpu is 115U CPU 943B My rack is not complete... I.e we only received the printed circuit board for the rack with no model number sticker (see pics). CPU wont go to run mode. i believe because i dont have the IM or the termination resistor plugged in. Im looking for a way to add the resistor without purchasing the IM module. THanks Adam Attachment 20140617_100525.jpg (148 Downloads)

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6/17/2014 4:13 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	pic 2 Attachment 20140617_100554.jpg (152 Downloads)

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6/17/2014 4:18 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	its just a piece of hardware we obtained to test from the customer. We are unable to determine if customer has the end IM module or not. Thats all we got right now. we erased the whoe PLC, added OB1 with 1 rung and tried to go in run mode. no go... THanks Adam

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6/17/2014 4:36 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 5/27/2023 Posts: 2321 Rating: (303)	adamix Navnag adamix Hello i have an old CPU115u system with few I/O cards. Got it connected, but no matter what i do i cant get it to RUN. It always flashes error RED. I believe i need a IM or termination resistor connected. Does anyone know exact pins on the IM connector where i can connect the resistor? Should i use standard 120Ohms? Thanks Adam Hello Adam The information provided by you is insufficient for anyone to be able to assist you. Please provide the MLFB ( Order Nos ) of the CPU , Rack amd IM that you are referring to. Also if it was an existing syste, how did the problem start ? Cheers Navnag Hello Navnag Cpu is 115U CPU 943B My rack is not complete... I.e we only received the printed circuit board for the rack with no model number sticker (see pics). CPU wont go to run mode. i believe because i dont have the IM or the termination resistor plugged in. Im looking for a way to add the resistor without purchasing the IM module. THanks Adam Hello Adam You don't necessarily need an IM / Terminating resistor. If fact you should be able to get the CPU into RUN Modue by just plugging in the Power supply and CPU into the Rack. In you case, however as we can see it, is just a PCB ( probably removed from a S5-115U Rack ). Iam not sure if this is sufficient for operating the hardware Mybe you should try testing with a real S5-115U rack. Cheers Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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6/17/2014 4:43 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	Navnag adamix Navnag adamix Hello i have an old CPU115u system with few I/O cards. Got it connected, but no matter what i do i cant get it to RUN. It always flashes error RED. I believe i need a IM or termination resistor connected. Does anyone know exact pins on the IM connector where i can connect the resistor? Should i use standard 120Ohms? Thanks Adam Hello Adam The information provided by you is insufficient for anyone to be able to assist you. Please provide the MLFB ( Order Nos ) of the CPU , Rack amd IM that you are referring to. Also if it was an existing syste, how did the problem start ? Cheers Navnag Hello Navnag Cpu is 115U CPU 943B My rack is not complete... I.e we only received the printed circuit board for the rack with no model number sticker (see pics). CPU wont go to run mode. i believe because i dont have the IM or the termination resistor plugged in. Im looking for a way to add the resistor without purchasing the IM module. THanks Adam Hello Adam You don't necessarily need an IM / Terminating resistor. If fact you should be able to get the CPU into RUN Modue by just plugging in the Power supply and CPU into the Rack. In you case, however as we can see it, is just a PCB ( probably removed from a S5-115U Rack ). Iam not sure if this is sufficient for operating the hardware Mybe you should try testing with a real S5-115U rack. Cheers Navnag Thanks for your reply. You would think rest of the rack would only provide earth ground to the circuit? That shouldnt affect the CPU. Anyways, here are some screens from ISTACK. What do you think ? Attachment 20140617_104020_resized.jpg (147 Downloads)

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6/17/2014 4:44 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	pic 2 Attachment 20140617_104045_resized.jpg (128 Downloads)

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6/17/2014 4:53 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	more interesting, if i just monitor the input bits. my Input card works, flaging all bits in first 4 bytes. So looks like I/O is working , but still get that error and wont go in RUN mode...

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6/17/2014 5:20 PM	Rate (0)
adamix Regular Member Joined: 8/9/2013 Last visit: 5/25/2023 Posts: 15 Rating: (0)	Got an anwser from another forum. Turns out you need a jumper between d30 and z30 on IM connector. This bypasses PEU signal. Works perfectly now, CPU is in RUN mode! Thanks! Adam

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