slc 505 message writing to plc5

[jude]

I have a slc5/05 writing to a plc5/40 processor ( using message), everythings works ok for hours sometimes days then it gives error 37 and stops sending information, the error bit sets I have cleared the error bit in the set up screen but it does not fix problem so far the only way I have been able to clear fault is to reload a program with no faults in it , I am assuming there is an easier way I just have not found it, any suggestions would be appreciated

 

[Ken Roach]

Error code 37 is an ordinary timeout. You usually see it when the target device is physically disconnected.

The first thing I would do is make sure there is a Diagnostic data file defined for Channel 1 of the SLC-5/05 so that you can determine if there are physical problems with your local Ethernet media or port.

Next post the MSG control logic you are using in the SLC-5/05 so that Forum members can suggest reset logic. ZIP and post the *.RSS file or a screenshot. Are you sending messages to any other devices from this SLC ?

 

[jude]

Hi Ken
we use data highway+ to communicate and it is a 5/04.Anyway I have 3 5/04 plcs writting messages to the one plc5 processor and ours is a 7 day 24 hour operation , the other 2 are configured the same way with no problem, At this point I have added and removed rungs o and 1 in ladder 4 added and removed the N7:60 and N7:30 bits 15 in rungs 19 and 20 and also added and or removed rungs 21 and 22 and any combination of the above and like I said earlier it can run for days or hours but when I get error 37 I cannot reset it.

 

[jude]

I think this is my second try stopped half way through prevous attempt

 

[jude]

Internet explorer stopped working during prevous upload

 

[Mickey]

First thing to do is check the network, wiring, termination resistors and everything is tight.

I would consider sequencing your message instructions only have one enabled at a time.
A counter works well for this.

Better yet put all message instruction in your PLC5 and sequence thru them there.
Again a counter works well for this. Only one message instruction enabled at a time will keep traffic down to a minimum .

For the one word instruction ( if this is the same in all your SLCs) I would consider
using Global Status Flags/Words. See Pdf's below for how to set this up. There is a small difference between the SLC and PLC. This is a very efficient way to pass one word between processors.

 

[Firejo]

I’d use the error bit on each MSG to unlatch the enable bit and let it run. If you’re only getting an occasional error then let it error and move on.

 

[Firejo]

I also agree that only one message at a time should be enabled at a time.

 

[jude]

I did try the error bit to reset and it made no differance, although strangely enough after I loaded it back in to the processor almost 4 weeks ago I have not seen the error again,I hate when something appears to fix it self and I have no idea why because following MURPHYS LAW (I am Irish) I expect it to return with a vengence