Panasonic FP3 - Page 136

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
T
g
= 1.30
×
number of ex
p
ansion FP I/O terminal
T
g
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
01234
FP3/FP10S CPU
Power supply unit
8-5. Transfer Time