GPS Time synchronization

I am going to work on a SCADA-telemetry project using a Modicon Quantum hot standby as a MTU data concentrator. One requirement is for this to be synchronized with a GPS clock as well as broadcast the time to several RTUs (Quantum, Compact, other RTUs using Modbus RTU)
I would very much appreciate if anyone has used this with Modicon before. Which products have been used before and are there any pitfalls?

Check out the following link for a GPS module that is compatible with the TSX Quantum PLC. This module will provide the time synchronization for the TSX Quantum and you can use your standard communication logic to broadcast this information to the RTU's. In the RTU you will need to develop the logic that will take your GPS TIME and update the PLC RTC on reception of your GPS TIME. What programming package are you using for the PLC?

http://www.monaghan-engineering.com/

Regards
Robert Willis
Square D Company
Houston, Texas

Thanks for the info.
I plan to use Proworx for all MTU and RTU, only reason we have used it for a similar application recently.