ABB AC 31 - 1.4. Reply times for MODBUS communication

Communication
Page 7-10 ABB Control - AC 31
1SBC 260400 R1001-b 06.99
1.4. Reply times for MODBUS communication
The MODBUS processing time depends on:
- The transmission speed
- The number of frame bytes
- The central unit cycle time
- The central unit load factor
The following times are for indication purposes only.
●
●●
● Reply times with a 40 or 50 series central unit
Cycle time = 10 ms
Load factor = 80%
Speed = 9 600 Bauds
Nr. of variables Bits Words
read (ms) write (ms) read (ms) write (ms)
1 10 - 60 50 10 - 60 60
10 10 - 60 60 10 - 60 110
50 10 - 60 110 110 - 170 220
100 50 - 60 110 220 -280 390
150 50 - 110 - -
255 50 - 110 - -