Mitsubishi QJ71GP21-SX, Reference Manual

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7
- 1 7.1 Link Scan Time
7
PROCESSING TIME
CHAPTER7 PROCESSING TIME
This chapter explains the processing time of the CC-Link IE controller network.
7.1 Link Scan Time
The link scan time of the CC-Link IE controller network is obtained from the following
calculation formulas.
(1) When assigned in LB/LW settings (1) and LX/LY settings (1)
(2) When assigned in either LB/LW settings (2) or LX/LY settings (2) in
addition to the above (1)
* 1 Excluding the points assigned to reserved stations.
* 2 Time required for reconfiguring the data link when the CC-Link IE controller network is
disconnected and reconnected due to recovery from cable disconnection or power OFF ON.
LS = [KB + (n × 56) + {LB + LY + (LW × 16)} 8 × 0.016
+ (N
T
× T × 30)] 1000 + Nc [ms]
LS = [KB + (n × 116) + {LB + LY + (LW × 16)} 8 × 0.016
+ (N
T
× T × 30)] 1000 + Nc [ms]
LS: Link scan time
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)
*1
( Section 6.3.1 LB/LW settings)
LW: Total number of LW points set in LB/LW settings (1) and (2)
*1
( Section 6.3.1 LB/LW settings)
LY: Total number of LY points set in LX/LY settings (1) and (2)
*1
( Section 6.3.2 LX/LY settings)
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 ( Section 6.3.6
Supplementary settings)
Nc: Line control time
*2
(Normal: 50ms, Worst: 100ms)
KB: Constant
Table 7.1 Link scan time constant (KB)
Network range assignment status
KB
Total No. of stations is
1 to 32
Total No. of stations is
33 to 64
Total No. of stations is
65 to 120
When assigned in LB/LW settings (1) and LX/LY
settings (1)
1100 2100 3100
When assigned in either LB/LW settings (2) or LX/LY
settings (2) in addition to the above assignment
1100 1100 1100