Synchronise Modicon PLC clocks from HMI

[burtonoscar]

Our topology is Wonderware InTouch 7.1 (soon to upgrade to 10) and we have several independent Modicon 984 processors on several modbus+ hwys. Anyone have experience or can offer their recommendations setting up our Master-Clock and periodically write the current time to a Modicon 984 via InTouch? Thanks in advance!

 

[iknowsomeplc]

Its not that difficult I think.
Generally Modicon PLCs has a Hardware Clock which uses 8 4xxx registers to store. Starting register can be configured in the controller configuration window.
4x +0 Bit 1= Set clock
Bit 2 = Read Clock
Bit 3 = Done
Bit 4 = Error

4x+1 = Day of week ( 1 to 7)
4x+2 = Month
4x+3 = Day
4x+4 = Year
4x+5 = Hour (24 hour format)
4x+6 = Minutes
4x+7 = Seconds