Definition

The applicative time stamping provides time stamped events buffers to the PLC application in order to be accessed from a 3rd party SCADA which is not interfaced via OFS/OPC DA. The user can convert the format of events read from time stamped events buffers into a user format dedicated to the 3rd party SCADA.

An event is a discrete I/O value change (transition) detected by a time stamping module. The applicative time stamping provides a consistent SOE (sequence of events), time stamped at the source.

Sources

The applicative time stamping solution is managed by the following events sources:

  • BMX ERT 1604 T module inputs

  • 140 ERT 854 •0 module inputs

  • Discrete I/O modules inputs or outputs in a Modicon X80 Ethernet I/O drop with a BMX CRA 312 10 module

The applicative time stamping is supported in Quantum Hot Standby systems.

In a safety Quantum application, the applicative time stamping is only managed by 140 ERT 854 20 module inputs.

Process

Time stamped events are managed as follows:

  • Each time stamping module records events in its local buffer.

  • The PLC application consumes time stamped events from the modules local buffer and stores the data in the PLC raw records buffer.

  • The PLC application converts the PLC raw records data to a user format record and stores the data.

  • The supervision application consumes the user format records.

Solution Configuration

On discrete I/Os time stamped by a BMX CRA 312 10, the user can configure:

  • the behavior of time stamped buffers on:

    • buffer full

    • power on

    • Stop to Run transition

  • the edges transitions to time stamp (rising, falling, rising, and falling edges for each discrete I/O)

On BMX ERT 1604 T modules, the above mentioned parameters are preset and cannot be changed:

  • Stop the recording on buffer full.

  • Keep module buffer content on power on if the application is the same.

  • Keep module buffer content on Stop to Run transition.

  • Both edges transition (edge detection).