Appendix 7 Processing Time; Link Scan Time - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 7
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.

Link scan time

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, remote device net mode, and remote I/O net mode is explained.
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) [s]
BT: Constant (transmission speed)
Transmission speed 156kbps
BT 51.2
NI: Last station number in A, B, and C (The number of occupied stations included, but a reserved station 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 included, but a reserved station excluded. The value
should be multiples of 8.)
Last station No. 1 to 8
NI, NW 8
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.)
ST: Constant (The largest value in the results of  to . When B is 0, the result of  is ignored. When C is 0, the result of 
is ignored.)
 800 + (A  15)
 900 + (B  50)
 C  26: 1200 + (C  100), C > 26: 3700 + {(C - 26)  25}
EX: Constant (Add 50 to the sum in the table below when the remote net Ver.2 mode is used.)
Extended cyclic setting Number of occupied stations
1 station occupied
Single 0
70  number of stations
Double
90  number of stations
Quadruple
110  number of stations
Octuple
TR: Transient processing time (added only when a transient request processing is executed)
• 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
Processing Time
625kbps
12.8
9 to 16 17 to 24 25 to 32
16 24 32
2 stations occupied
0
80  number of stations
110  number of stations
160  number of stations
2.5Mbps 5Mbps
3.2 1.6
33 to 40 41 to 48
40 48
3 stations occupied
0
90  number of stations
130  number of stations
210  number of stations

Appendix 7 Processing Time

10Mbps
0.8
49 to 56 57 to 64
56 64
4 stations occupied
0
100  number of stations
150  number of stations
260  number of stations
APPX
169
A