YOKOGAWA VZ20X, User Manual

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IM 77V01B01-01EN 5th Edition: 2023.03.07-00
Example of writing the time
Set date and time
: 2021/7/20 12:12:12.123
UNIX time default : 1970/1/1 0:0:0.000
(1) Find the difference between the current time and the UNIX time default (Find the
difference by using the functions for handling time that are available in each
programming environment.)
Day difference 18828
Hour difference 12
Minute difference 12
Second difference 12
Millisecond difference 123
(2) Convert the differences to milliseconds
Before conversion Conversion formula Result of conversion calculation
Day difference 18828 18828
×
24×60×60×1000 1626739200000
Hour difference 12 12×60×60×1000 43200000
Minute difference 12 12×60×1000 720000
Second difference 12 12×1000 12000
Millisecond difference 123 123 123
Total millisecond value 1626783132123
(3) Convert the total millisecond value to 64-bit unsigned hexadecimal
1626783132123
→
0000017AC3D4A9DB
(4) Write by Modbus
Send command [PDU] 011000000004080000017AC3D4A9DB
Function code 10
Register start No. 0000
Number of registers 0004
Byte count 08
Write data 0000017AC3D4A9DB