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FP3 MEWNET - TR
Chapter8 - 5. Page.134
130
J
Scan time of the MEWNET - TR system (Ttr)
x
The scan time of the MEWNET -TR system (Ttr) is the time it takes for the FP3 transmitter master unit to transmit
output information to or receive input information from each slave station.
x
Ttr is calculated by the following formula.
Ttr (ms) = Ta + Tb + Tc + Td + Te + Tf + Tg + 3.20
Ta to Tg = I/O response time of the slave station
Slave station combinations
Item
FP I/O
transmitter unit
Expansion FP I/O
terminal unit
I/O response time calculation formula
Ta
4 - input type
-
Ta = 1.01
×
number of FP I/O transmitter units
Tb
4 - output type
-
Tb = 0.63
×
number of FP I/O transmitter units
Tc
8 - input type or
16 - input type
-
Tc = 1.06
×
number of FP I/O transmitter units
Td
8 - output type or
16 - output type
-
Td = 0.68
×
number of FP I/O transmitter units
Te
8 - input type or
16 - input type
8 - input type or
16 - input type
Te = 1.16
×
number of expansion FP I/O terminal
units
Tf
8 - output type or
16 - output type
8 - output type or
16 - output type
Tf = 0.78
×
number of expansion FP I/O terminal
units
Tg
8 - input type or
16 - input type
8 - output type or
16 - output type
Tg = 1.30
×
number of expansion FP I/O terminal
Tg
8 - output type or
16 - output type
8 - input type or
16 - input type
Tg = 1.30
×
number of expansion FP I/O terminal
units
Example: The maximum input response time (Tires) of the MEWNET -TR system in the diagram below is calculated
as follows. The scan time of the CPU is 7.5 ms.
x
Scan time of the MEWNET -TR system (Ttr)
= 0 + 0 + 1.06
×
3 + 0.68
×
1 + 0 + 0.78
×
1 + 0 + 3.20
= 7.84 ms
x
Maximum input response time (Tires)
= Ttr
×
2 + Tc + Tidly
= 7.84
×
2 + 7.5 + 1
= 24.18 ms
8 - output
type
8 - input
type
16 - input
type
8 - output
type
8 - input
type
16 - output
type
FP3 transmitter master unit
0
1
2
3
4
FP3/FP10S CPU
Power supply unit
8 -5. Transfer Time
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