adccommunitymod (AutomationDirect) asked a question.
Created Date: May 04,2000
Created By: JasonK
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I have 3 DL250's w/ ECOM Modules, all connected to a 3com hub. A PC running Direct Soft 3.0C is also connected to the hub. I am treating PLC#1 as the master, PLC #2 as a slave and PLC#3 as a slave. The master needs to receive 16 bits of data from one V memory location of each slave. The ECOM modules are set up properly and module IDs are set. After programming the read/write instructions as detailed in the ECOM manual I receive nothing at the master end. If you eliminate the read/write funcitions for one of the slave PLCs in the master program everything works great. Put the logic back in the master and sorry no data. I have tried both interlocking styles and there is no difference. Any help would be much appreciated
Created Date: May 04,2000
Created by: JasonK
I have 3 DL250's w/ ECOM Modules, all connected to a 3com hub. A PC running Direct Soft 3.0C is also connected to the hub. I am treating PLC#1 as the master, PLC #2 as a slave and PLC#3 as a slave.
The master needs to receive 16 bits of data from one V memory location of each slave. The ECOM modules are set up properly and module IDs are set. After programming the read/write instructions as detailed in the ECOM manual I receive nothing at the master end.
If you eliminate the read/write funcitions for one of the slave PLCs in the master program everything works great. Put the logic back in the master and sorry no data. I have tried both interlocking styles and there is no difference. Any help would be much appreciated
Created Date: May 04,2000
Created by: franji1
Can DirectSoft talk to all 3 controllers via ECOM protocol?
Created Date: May 05,2000
Created by: mike.stillwell
Each individual RX or WX instruction - even to the same slave - needs to be interlocked because the CPU can only process one network transaction at a time.
Can you set up the master to access the slaves individually??
Created Date: May 15,2000
Created by: Mike McClanahan
Could you be trying to process another transaction (to the second slave) while there is a transaction pending for the first slave? Had a lot of trouble with this until I finally figured out that I was using the wrong module busy flag for the ECOM module.
Mike