Mitsubishi Electric MELSEC-Q Series - Chapter 7 Processing Time; Link Scan Time

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CHAPTER 7 PROCESSING TIME
This chapter explains the processing time of the CC-Link IE Controller Network.
7.1 Link Scan Time
The link scan time (LS) of the CC-Link IE Controller Network is obtained from the following calculation formulas.
(1) For other than the Extended Mode
(a) When assigned in LB/LW settings (1) and LX/LY settings (1)
(b) When assigned in either LB/LW settings (2) or LX/LY settings (2) in addition to the
above (1)
(2) For the Extended Mode
*1 Time required for reconfiguring the data link when CC-Link IE Controller Network is disconnected and reconnected due
to recovery from cable disconnection or power OFF  ON (0ms if the module is not disconnected or reconnected).
During the line control, the cyclic transmission status and baton status become error in all stations.
When a set value of constant link scan is large, it may exceed 100ms to complete the data link reconstruction, since it
takes time to start the line control.
*2 If cables are disconnected or power is turned on simultaneously at multiple sites, the line control time may exceed
100ms by accumulation of line control processing loads.
LS = [KB + (n × 56) + {LB + LY + (LW × 16)}  8 × 0.016 + (N
T
× T × 30)]  1000 + Nc [ms]
KB (Constant): Total number of stations: 1 to 32  1100, Total number of stations: 33 to 64  2100,
Total number of stations: 65 to 120  3100
LS = [1100 + (n × 116) + {LB + LY + (LW × 16)}  8 × 0.016 + (N
T
× T × 30)]  1000 + Nc [ms]
LS = [1100 + (n × 116) + {LB + LY + (LW × 16)}  8 × 0.017 + (N
T
× T × 30)]  1000 + Nc [ms]
Definition of valuables in the calculation formulas shown in (1) and (2)
• n: Total number of stations (actually connected stations, not including reserved stations)
•LB:
Total number of LB points set in LB/LW settings (1) and (2) (except for reserved stations)
( Page 185, Section 6.3.1)
•LW:
Total number of LW points set in LB/LW settings (1) and (2) (except for reserved stations)
( Page 185, Section 6.3.1)
•LY:
Total number of LY points set in LX/LY settings (1) and (2) (except for reserved stations)
( Page 192, Section 6.3.2)
•N
T
:
Number of stations that execute transient transmissions (total number of stations when cyclic
transmission punctuality is assured)
•T:
Maximum number of transient transmissions for one station ( Page 201, Section 6.3.6)
•Nc:
Line control time per station
*1*2
(Normal: 50ms, Worst: 100ms)