Mitsubishi Electric L26CPU-BT User Manual page 444

(2) Master station (RY)  Local station (RX), Master station (RWw)  Local station
(RWr)
This indicates the time from the moment a master station CPU device turns ON (OFF) until the corresponding
local station CPU device turns ON (OFF).
Or, it indicates the time from when data is set to a master station CPU device until data is stored in the
corresponding local station CPU device.
(a) Expression
The meanings of symbols in the table are as follows:
• SM : Master station sequence scan time
• LS: Link scan time
• SL: Local station sequence scan time
• n: LS  SM (Digits past the decimal point are rounded up to the nearest integer.)
• k: LS  SL (Digits past the decimal point are rounded up to the nearest integer.)
With block guarantee of cyclic data per station
Calculation
value
Asynchronous mode
(SM  n) + (LS  2) + {SL  (k + 1)}
Normal value
(SM  n) + (LS  3) + {SL  (k + 1)}
Max. value
(b) Calculation example
Master station sequence scan time of 20ms, link scan time of 3ms, and local station sequence scan time of
10ms
With block guarantee of cyclic data per station
Calculation
value
Asynchronous mode
(20  1) + (3  2) + {10  (1 + 1)} =
Normal value
46ms
(20  1) + (3  3) + {10  (1 + 1)} =
Max. value
49ms
442
Synchronous mode
(SM  n) + (LS  2) + {SL  (k + 1)}
(SM  n) + (LS  2) + {SL  (k + 1)}
Synchronous mode
(20  1) + (3  2) + {10  (1 + 1)} =
46ms
(20  1) + (3  2) + {10  (1 + 1)} =
46ms
Without block guarantee of cyclic data per station
Asynchronous mode
SM + (LS  2) + SL (SM  n) + (LS  2) + SL
SM + (LS  3) + SL (SM  n) + (LS  2) + SL
Without block guarantee of cyclic data per station
Asynchronous mode
20 + (3  2) + 10 = 36ms (20  1) + (3  2) + 10 = 36ms
20 + (3  3) + 10 = 39ms (20  1) + (3  2) + 10 = 36ms
Synchronous mode
Synchronous mode