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MELSEC-Q
3 SPECIFICATIONS
3.5.3 Transmission delay
Transmission delay time depends on the use of Data consistency dedicated instruction.
The following notations are used in the calculation formulas (1) and (2).
ST
: Sequence scan time [ms]
LS
: Link scan time [ms] (Refer to Section 3.5.1.)
PIT
: Production inhibit time [ms] (Refer to Section 3.4.5.)
LC
: Communication cycle time [ms]
LS < PIT: LC = LS + PIT [ms]
LS
≥
PIT: LC = LS [ms]
(1) When Data consistency dedicated instruction is not used
The following table lists transmission delay time when I/O data is read/written
using auto refresh or MOV/FROM/TO instruction.
(a) Transmission delay of send data
Item
Transmission delay time
Maximum value
LC × 2 + ST [ms]
Normal value
LC + ST × 0.5 [ms]
(b) Transmission delay of receive data
Item
Condition
Transmission delay time
Maximum value
Reading the receive data using MOV or
FROM/TO instruction
LC × 2 [ms]
Using auto refresh
LC × 2 + ST [ms]
Normal value
Reading the receive data using MOV or
FROM/TO instruction
LC [ms]
Using auto refresh
LC + ST×0.5 [ms]
(2) When Data consistency dedicated instruction is used
The following table lists transmission delay time when I/O data is read/written
using Data consistency dedicated instruction.
(a) Transmission delay of send data (using DNTMWR or DNTSWR)
Item
Condition
Transmission delay time
Maximum value
ST × 2 LC
LC × 3 [ms]
ST × 2 > LC
ST × 2 + LC × 2 [ms]
LC < ST
ST × 4 [ms]
Normal value
—
ST + LC [ms]
(b) Transmission delay of receive data (using DNTMRD or DNTSRD)
Item
Condition
Transmission delay time
Maximum value
ST × 2 LC
ST + LC [ms]
ST LC < ST × 2
ST + LC × 2 [ms]
LC < ST
ST × 3 [ms]
Normal value
—
ST + LC [ms]
Содержание QJ71DN91
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