Regarding the long-term trend recording function of the CS3000, how many days can long-term trends be stored? Why do different tag numbers have different retention times?
Thread Content
As title: CS3000R system 1. What is the default time period for long-term trend recording? 2 days – does this two-day period correspond to 2,880 points? 2. Why are the parameters with different IDs stored for different durations within the same HIS and the same historical station? 3. If you want to increase the number of days for storage, for example to 365 days, what kind of hardware upgrades are required?
It depends on the settings of your DCS system; if it’s an important parameter, it can be set separately! The specific system settings vary!
1. What is the default time period for long-term trend recording? 2 days – does this two-day period correspond to 2,880 points? For trends over a longer period, it depends on how long you set it to be saved; a file is generated every 2880 points. If it’s a one-minute trend, then 2 days’ worth of data will be recorded, while for a one-second trend, a file is created every 48 minutes. 2. Why are the parameters with different IDs stored for different durations within the same HIS and the same historical station? If there is a long-term trend package, it will be saved for the duration you specify ； If not, save 2880 points; for a one-minute trend, this will cover 2 days of data, while for a one-second trend, one file will be created every 48 minutes. You can calculate the rest by yourself. 3. If you want to increase the number of days for storage, for example to 365 days, what kind of hardware upgrades are required? There are long-term storage packages; in theory, as long as the hard drive is large enough, data can be stored indefinitely. From our experience, if other workstations are also used as a reference, it is recommended not to store data for more than 3 months, otherwise performance will be affected.
For the third item, considering adding a server to dump data,
For the same long-term trend recording package, if the number of measurement points increases (for example after an expansion) while the historical stations remain unchanged, will the number of days of recording decrease?
1. I remember that the default setting for the software is 10 minutes, but this setting does not meet the process requirements; they consider even 10 seconds to be too long. Two days is 48 hours, and one hour is 60 minutes; therefore, the sampling period for your historical data is 1 minute. 2. This Yokogawa DCS has limitations on the number of sampling points per cycle; therefore, for large-scale projects, there may be a need for optimized allocation based on the process requirements. 3. If a long-term trend authorization is available, the number of days for which historical trends can be stored is determined by the capacity of your hard drive. If the hard drive is large enough, ten thousand years isn’t a problem at all.
1. I remember that the default setting for the software is 10 minutes, but this setting does not meet the process requirements; they consider even 10 seconds to be too long. Two days is 48 hours, and one hour is 60 minutes; therefore, the sampling period for your historical data is 1 minute. 2. This Yokogawa DCS has limitations on the number of sampling points per cycle; therefore, for large-scale projects, there may be a need for optimized allocation based on the process requirements. 3. If a long-term trend authorization is available, the number of days for which historical trends can be stored is determined by the capacity of your hard drive. If the hard drive is large enough, ten thousand years isn’t a problem at all.