Sunday, July 6, 2014

Not Quite Aftermath...

I am referring to the aftermath of the great electric short circuit, which destroyed an RS-232 to RS-485 converter.  After going over all of the physical stuff, and swapping out the Modicon PLC (node 11, slots 3, 4, & 5), it seems we are having intermittent Modbus communication failures.
The two Optomux-clone nodes, which are on the same RS-485 network, are working fine.  But on occasion, the DR3 driver returns a CRC error - saying the calculated CRC of the reply message from the PLC, does not match the actual CRC included in the same reply message.
Now, I had seen this before, during SPOCS 2.2 development, and thought I had fixed it.  Looks like I need to look more closely at DR3, or maybe the interaction between DR3 and driver DR1.
I looked at the SPOCS page over on SourceForge today.  360 downloads, and now we are picking up references in tweets, and "likes" on Facebook!  Thanks to everyone who "liked" SPOCS!

No comments:

Post a Comment