Using The Wall Clock Time In Controllogix

Furthermore the controllogix processor will not automatically adjust for daylight savings time.

Using the wall clock time in controllogix.

For more information. Needed something like this to transfer system time to an rsview register for an event time stamp. The controllogix backplane for coordinated system time cst and. Once all the clocks in a control system share a synchronized common understanding of system time events being monitored in the control system for example the controllogix system can be time stamped to a very high degree of accuracy.

The first step is to find out the current time which you can read from your processor using a gsv instruction. Yet another section would display the total number of seconds that have passed since jan 1 1970. Time synchronization is accomplished by using these methods standards and protocols. Imagine a large clock on the wall with different sections.

12 thoughts on reading the controllogix system time in ladder logic steve august 18 2010 at 10 43 pm. If you are using the ab controllogix platform and want a bit to cycle on and off at a consistent rate you can address one of the bits of the register that represents the clock microseconds. This is where the clock update tool can come in handy. Tight integration between the programming software controller and i o modules reduces development time and cost at commissioning and during normal operation.

1756 time module obtains time from various sources and provides time synchronization on other devices by acting as a gateway between different time synchronization methods and standards. Look at the date time tab in the controller properties window. Gsv wallclocktime the register containing the microseconds is the 7th element in the array. Unlike the plc 5 slc 500 and micrologix all of which have a status file to access similar information in a controllogix or compactlogix requires a gsv get system variable or ssv set system variable instruction.

However many programmers began to enable the tz and dst settings inadvertently when using the set time button in controller properties. These sections would be the attributes. Another section attribute would be for utc. We set the clock forward one hour in the spring and back one hour in the fall.

In v16 and later this button not only sets the controller s clock to match the pc s date and time but also sets the controller s clock to match the pc s tz and dst settings. Controllogix control systems our controllogix control systems use a common control engine with a common development environment to provide high performance in an easy to use environment. The scan time of the plc will dictate how fast the register.