Profibus vs Modbus
Profibus DP vs Profibus PA vs Profibus FMS
Parameters | Profibus | Modbus | ||
Profibus DP | Profibus PA | Profibus FMS | ||
Website | www.profibus.com | www.Modbus.org | ||
Intrinsically Safe | No | Yes | No | No |
Operaing voltage | 9-32v DC | |||
Maximum Cable Length | 100m-24km | 1900m | 200m-19.2km | 1200m |
Goveming Standard(S) | EN50170 DIN 19245 p3 |
IEC-61158-2 DIN 19245 p4 |
EN13321/1 DIN 19245 | EN1434-3 IEC870-5 |
Communication Methods |
Master/stave peer to peer | Master/stave peer to peer | Master/stave peer to peer | Master/Slave |
Communication Speed |
15-12 Mbits/5 | 31.25 kbits/s | 9-6-500 kbits/5 | 9.6-115-2 kbits/s |
Media Access Algorithm |
Token passing | Token passing | Token passing | Token passing |
Max. Data Size | 248 bytes | 248 bytes | 248 bytes | 250 bytes (125 registers) |
Max Station | 127 devices | 32 devices | 127 devices | 247 per network |
Must Read : What is Profibus ? How Profibus Work ?
Must Read : Profibus Cable & Profibus Connectors Tricks & Tips