| ??? 12/16/04 22:40 Read: times |
#83280 - Control system Responding to: ???'s previous message |
I am not sure why you would have a master controller, unless you needed protocol conversion. If you are designing from scratch, I would consider purchasing a drop in object like DNP 3.0 or Modbus RTU for the PC and writing the driver on the controllers for only what functions you need. These are open protocols and documentation is readily available. Since these are open protocols they lack security, but for an in plant system this should not be of concern. You can configure in MultiDrop-Multinode or Star or combination of both depending on location of controllers.
Eric's suggestion sounds like a good solution in your case. Non isolated RS485: suspectible to common mode noise, require common ground. In well grounded environments and with shielded cables a good solution. Multinode. Have fun, |
| Topic | Author | Date |
| Control system | 01/01/70 00:00 | |
| buses for industrial | 01/01/70 00:00 | |
| CAN or RS-485 | 01/01/70 00:00 | |
| one way of master slave | 01/01/70 00:00 | |
| RS485 | 01/01/70 00:00 | |
| Control system | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| modbus or not | 01/01/70 00:00 | |
| rs-485 | 01/01/70 00:00 | |
| Rs485 vs CAN | 01/01/70 00:00 | |
| CAN | 01/01/70 00:00 | |
| rs-485,high speed? | 01/01/70 00:00 | |
| UART speed | 01/01/70 00:00 | |
| Speed | 01/01/70 00:00 | |
| Go Speed Racer! | 01/01/70 00:00 | |
| comments on speed and the above | 01/01/70 00:00 | |
| Daisy chain | 01/01/70 00:00 | |
| Daisy,Daisy..... | 01/01/70 00:00 | |
| no repeat | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Hub ? | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| More modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
failed links | 01/01/70 00:00 |