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FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
2.4.2
Calculation method
Calculate the required time "T
"INT(n)" in the calculation formula indicates an integer obtained by truncating decimal places of "n".
1. Length of 1 character
In inverter communication, the communication setting is as shown in following table.
The length of 1 character is as shown in the following calculation expression.
Length of 1 character = Start bit + Data length + Parity bit + Stop bit
Name
Start bit
Data length
Parity bit
Stop bit
Total
2. Execution times in inverter communication instructions
Execution times in inverter communication instructions is as shown in the following calculation expression.
T
= T
+ T
+ T
inv
1
2
T
= 1[ms]
1
T
= {n(T
+T
2
4
Sending and
receiving
frequency
T
= 1[ms]
3
Calculate "T
", "T
4
Communication
time
T
4
T
5
T
[n]
6
T
[n]+T
[n]
7
9
T
[n]
8
E-12
" for inverter communication instruction in units of "ms" as follows.
inv
= 10[bit]
Set value
bit
-
1
7
7
Even number
1
1
1
10
3
)}+T
[n][ms]
5
6
T
[1]+T
[2]+T
6
6
6
" and "T
[n]" as shown in the following table.
5
6
15
) + 1) Scan time
= ( INT (
Scan time
= 1[ms]
• For Scan time < T
[n]+T
7
T
[n]+T
[n]+T
7
8
9
= ( INT (
Scan time
• For Scan time T
[n]+T
7
T
[n]+T
[n]+T
7
8
9
= ( INT (
Scan time
1
= { (
Communication speed [bps]
= Data check time in inverters
[3]+
Calculation method
[n]+T
[n]
8
9
[n]
) + 1) Scan time
[n]+T
[n]
8
9
[n]
) + 2) Scan time
Number of sending and
) (
receiving characters
*4
2.4 Execution Times in Inverter Communication Instructions
Length of
) } 1000
*1
1 character
2 Specifications
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