Panasonic FP3 Technical Manual page 136

8-5. Transfer Time
J Scan time of the MEWNET- TR system (Ttr)
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.
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
Ta
4 - input type
Tb 4 - output type
8 - input type or
Tc
16 - input type
8 - output type or
Td
16 - output type
8 - input type or
Te
16 - input type
8 - output type or
Tf
16 - output type
8 - input type or
16 - input type
Tg Tg
8 - output type or
16 - output type
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.
Scan time of the MEWNET-TR system (Ttr)
Maximum input response time (Tires)
FP3/FP10S CPU
Power supply unit
8- input 8- input
type type
130
Expansion FP I/O
terminal unit
-
-
-
-
8 - input type or
16 - input type
8 - output type or
16 - output type
8 - output type or
16 - output type
8 - input type or
16 - input type
= Ttr × 2 + Tc + Tidly
= 7.84 × 2 + 7.5 + 1
= 24.18 ms
0 1 2 3 4
FP3 transmitter master unit
16- input 8- output 8- output
type type type
I/O response time calculation formula
Ta = 1.01 × number of FP I/O transmitter units
Tb = 0.63 × number of FP I/O transmitter units
Tc = 1.06 × number of FP I/O transmitter units
Td = 0.68 × number of FP I/O transmitter units
Te = 1.16 × number of expansion FP I/O terminal
units
Tf = 0.78 × number of expansion FP I/O terminal
units
Tg = 1.30 × number of expansion FP I/O terminal Tg = 1.30 × number of expansion FP I/O terminal
units
= 0 + 0 + 1.06 × 3 + 0.68 × 1 + 0 + 0.78 × 1 + 0 + 3.20
= 7.84 ms
16- output
type