Appendix 4 Data Link Processing Time; Appendix 4; Link Scan Time - Mitsubishi Electric MELSEC-Q Series User Manual

Appendix 4

This appendix describes data link processing time such as link scan time and transmission delay time.
When all the stations in a CC-Link system are normally performing data link, the retry processing time (RT) and return
processing time (F) that are included in the formulas are not required to be added.
Appendix 4.1
This section describes the scan time of a CC-Link system. How to calculate the link scan time of when a master/local
module is in the remote net mode and remote I/O net mode is explained.
(1) In the remote net mode
LS = BT{27 + (NI × 4.8) + (NW × 9.6) + (N × 30) + (ni × 4.8) + (nw × 9.6) + TR} + ST + EX +
RT + F [µs]
BT: Constant (transmission speed)
Transmission
speed
BT
NI: Last station number in A, B, and C (The number of occupied stations is included, but a reserved station
is excluded. The value should be multiples of 8.)
A: Last station number in a remote I/O station
B: Last station number in a remote device station (The number of occupied stations is included.)
C: Last station number in local stations, standby master stations, and intelligent device stations (The
number of occupied stations is included.)
NW: Last station number in B and C (The number of occupied stations is included, but a reserved station is
excluded. The value should be multiples of 8.)
Last
station No.
NI, NW
N: Number of connected modules (A reserved station is excluded.)
ni: a + b + c (A reserved station is excluded.)
a: Total number of stations occupied by a remote I/O station
b: Total number of stations occupied by a remote device station
c: Total number of stations occupied by local stations, standby master stations, and intelligent device
stations
nw: b + c (A reserved station is excluded.)
TR: Transient processing time (only when a transient request is issued)
• When a master station issues a transient request
180
• When a local station issues a transient request
40.8 × number of stations that issued a transient request
366
Data Link Processing Time

Link scan time

156kbps 625kbps
51.2
1 to 8 9 to 16 17 to 24
8 16
2.5Mbps
12.8 3.2
25 to 32 33 to 40
24 32 40
5Mbps 10Mbps
1.6 0.8
41 to 48 49 to 56 57 to 64
48 56 64