Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 21

Example link time calculations:
Master processing time (Tm)
SD8864
Max. scan time
Function
Frame mode
Number of bytes in request
Number of bytes in response
Character length
Baud rate
Slave delay time
T4 = 5 ms
5 ms
 5 ms = (1 + 1)  5 ms = 10 ms
T1 = INT +1
5 ms
T6  1 ms
8 Bytes  10 Bits
T7 =
19200 bps
T8 = 10 ms
25 Bytes  10 Bits
T9 =
19200 bps
3.5 Characters  10 Bits
T10 =
19200 bps
T5 = 1 ms + 5.2 ms + 10 ms + 14.0 ms + 2.8 ms = 33 ms
33 ms
 5 ms = (6 + 1)  5 ms = 35 ms
T2 = INT +1
5 ms
T3  1ms
Tm = 5 ms + 35 ms + 1 ms = 41 ms
Slave processing time (Ts)
Function
Frame mode
Number of bytes in request
Number of bytes in response
Character length
Baud rate
SD8864
Max. scan time
8 Bytes  10 Bits
T14 =
19200 bps
T15 = 5 ms
T11 = 5.2 ms + 5 ms + 5 ms = 15.2 ms
T12  1 ms
25 Bytes  10 Bits
 1000 (ms) + 1 ms  14.0 ms
T13 =
19200 bps
Ts = 15.2 ms + 1 ms + 14.0 ms = 30.2 ms
= 5 ms
= 5 ms
= Read holding registers 0 to 9 (function code: 03H)
= RTU mode
= 8 bytes (1 byte Address, 5 byte Frame, 2 byte CRC)
= 25 bytes (1 byte Address echo, 22 byte Frame, 2 byte CRC)
= 10 bits (1 bit Start bit, 8 bit Data length, 0 bit Parity bit, 1 bit Stop bit)
= 19.2 kbps
= 10 ms
 1000 (ms) + 1 ms  5.2 ms
 1000 (ms) + 1 ms  14.0 ms
 1000 (ms) + 1 ms  2.8 ms
= Read holding registers 0 to 9 (function code: 03H)
= RTU mode
= 8 bytes (1 byte Address, 5 byte Frame, 2 byte CRC)
= 25 bytes (1 byte Address echo, 22 byte Frame, 2 byte CRC)
= 10 bits (1 bit Start bit, 8 bit Data length, 0 bit Parity bit, 1 bit Stop bit)
= 19.2 kbps
= 5 ms
= 5 ms
 1000 (ms) + 1 ms  5.2 ms
3 SPECIFICATIONS
19
3.2 Link Time
3