Mitsubishi Electric MELSEC-Q Series User Manual page 379

(4) Master station ↔ local station (Ver.1-compatible slave station)
(a) Master station (RX)  local station (RY), master station (RWr)  local station (RWw)
This is the time between the device of the CPU module in a local station turning on (off) and the device of the
CPU module in a master station turning on (off).
This is also the time between data set in the device of the CPU module in a local station and the data stored
into the device of the CPU module in a master station.
[Formula]
The letters in the table mean as follows.
SM: Master station sequence scan time
LS: Link scan time
SL: Local station sequence scan time
LS SM (The decimal point is rounded up.)
n:
LS SL (The decimal point is rounded up.)
k:
With block guarantee of cyclic data per station
Calculation
value
Asynchronous mode
(SM × n) + (LS × 2)
Normal value
+ {SL × (k + 1)}
(SM × n) + (LS × 3)
Max. value
+ {SL × (k + 1)}
When master station sequence scan time is 20ms, link scan time is 3ms, and local station sequence scan
Ex.
time is 10ms
With block guarantee of cyclic data per station
Calculation
value
Asynchronous mode
(20 × 1) + (3 × 2)
Normal value
+ {10 × (1 + 1)} = 46ms
(20 × 1) + (3 × 3)
Max. value
+ {10 × (1 + 1)} = 49ms
Without block guarantee of cyclic data per station
Synchronous mode
{(SM × n) × 2} + LS
SM + (LS × 2) + SL
+ {SL × (k + 1)}
{(SM × n) × 3} + LS
SM + (LS × 3) + SL
+ {SL × (k + 1)}
Without block guarantee of cyclic data per station
Synchronous mode
{(20 × 1) × 2} + 3 20 + (3 × 2) + 10
+ {10 × (1 + 1)} = 63ms = 36ms
{(20 × 1) × 3} + 3 20 + (3 × 3) + 10
+ {10 × (1 + 1)} = 83ms = 39ms
Asynchronous mode
{(SM × n) × 2} + LS + SL
{(SM × n) × 3} + LS + SL
Asynchronous mode
{(20 × 1) × 2} + 3 + 10
= 53ms
{(20 × 1) × 3} + 3 + 10
= 73ms
APPENDICES
Synchronous mode
Synchronous mode
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