Dua Anjing
Member
Good Morning All
I have a small project with 7 Micrologix 1100's. One of these acts a Master and collects data from the remaining 7 via Ethernet Messaging. Currently we are only testing with the Master and a single Slave. If I enable Message instructions to all 7 PLC's (even though only 1 actually exists) my comms times blows out. I suspect that what is happening is that every scan (in the Master) I am requesting 7 MSG's with only 4 buffers available the remaining 3 are placed in a queue and over time (because of the speed at which I am trying read) I "choke" the Ethernet Port.
I was thinking that instead of "reading" data from all 7 Slave PLC's that I set them up to read/write data to the Master but I dont know what effect this extra traffic will have. I don't have access to the other 7 PLC's so I cant test. Is this "bottleneck" just a limitation of the 1100 PLC MSG System ? Or Will I see similar time blow-outs if I set up all 7 to Write data to the Master ?
Anyone out there have any idea's on how I can speed up my comms ?
I have a small project with 7 Micrologix 1100's. One of these acts a Master and collects data from the remaining 7 via Ethernet Messaging. Currently we are only testing with the Master and a single Slave. If I enable Message instructions to all 7 PLC's (even though only 1 actually exists) my comms times blows out. I suspect that what is happening is that every scan (in the Master) I am requesting 7 MSG's with only 4 buffers available the remaining 3 are placed in a queue and over time (because of the speed at which I am trying read) I "choke" the Ethernet Port.
I was thinking that instead of "reading" data from all 7 Slave PLC's that I set them up to read/write data to the Master but I dont know what effect this extra traffic will have. I don't have access to the other 7 PLC's so I cant test. Is this "bottleneck" just a limitation of the 1100 PLC MSG System ? Or Will I see similar time blow-outs if I set up all 7 to Write data to the Master ?
Anyone out there have any idea's on how I can speed up my comms ?