Overview

The following topics present graphically some of the devices combination allowed in a system time stamping architecture (it is not an exhaustive list, it represents typical application examples).

Modicon M580 CPU (Local Drop)

In this example, the Modicon M580 architecture contains a BME P58 •••• CPU and a BMX ERT 1604 T module.

The BME P58 •••• CPU and the BMX ERT 1604 T module are the time stamped events sources (the CPU time stamps transitions on internal variables).

The time source for the CPU is an NTP server connected to the Ethernet control network. The time source for the BMX ERT 1604 T module is an external clock (DCF77 or IRIG-B time format). The AVEVA Plant SCADA / OFS needs to be synchronized on an NTP server.

The GPS is a unique time reference for both BME P58 •••• CPU and BMX ERT 1604 T module. The time source for each BMX ERT 1604 T is an external clock (DCF77 or IRIG-B time format) synchronized on GPS. The BME P58 •••• CPU and the AVEVA Plant SCADA / OFS need to be synchronized on GPS.

The unique time reference can also be an NTP server (dedicated high accuracy hardware like a Gorgy Timing LEDI Network NTP Server for example) that provides the IRIG-B 004/5/6/7 or DCF77 time code for BMX ERT 1604 T synchronization. In this case, the GPS usage is not mandatory.

Modicon M580 CPU with a Modicon X80 Drop and a BME CRA 312 10 Time Stamping Module in a Multi-Layered Architecture

In this example, the Modicon M580 architecture contains a BME P58 •••• CPU and a remote I/O drop with a BME CRA 312 10 module.

The BME P58 •••• CPU and the BME CRA 312 10 module are the time stamped events sources. The CPU time stamps transitions on internal variables and the BME CRA 312 10 module time stamps I/O transitions on the discrete I/O modules in the remote I/O drop.

The time source for the CPU and BME CRA 312 10 module is an NTP server connected to the Ethernet control network.

The multi-layered architecture requires the device network to be linked to the control network with a ConneXium router. In this architecture, the BME NOC 03•1 module on the local drop is linked to the control network. Using a BME NOC 03•1 module is optional depending on the communication capability needs.

NOTE: It is necessary to choose an NTP server that provides stable clock synchronization and accurate NTP output.

Modicon M580 CPU with a Modicon X80 Drop and a BME CRA 312 10 Time Stamping Module in a Flat Architecture

In this example, the Modicon M580 architecture contains a BME P58 •••• CPU and a remote I/O drop with a BME CRA 312 10 module.

The BME P58 •••• CPU and the BME CRA 312 10 module are the time stamped events sources. The CPU time stamps transitions on internal variables and the BME CRA 312 10 module time stamps I/O transitions on the discrete I/O modules in the remote I/O drop.

The time source for the CPU and BME CRA 312 10 module is the BME P58 •••• CPU internal NTP server.

The flat architecture implies that all devices are connected to the same network.

Modicon M580 CPU with a Modicon X80 Drop Including BMX ERT 1604 T and BMx CRA 312 10 Modules

In this example, a Modicon M580 architecture contains 2 Modicon X80 Ethernet remote I/O drops.

On the local rack, the CPU time stamps transitions on internal variables. On each remote I/O drop, both BM• CRA 312 10 and BMX ERT 1604 T modules are the time stamped event sources (the BM• CRA 312 10 module time stamps I/O transitions on the discrete I/O modules in the remote I/O drop).

The GPS is a unique time reference for theBME P58 •••• CPU, the BMX ERT 1604 T and the BM• CRA 312 10 modules. The time source for each BMX ERT 1604 T is an external clock (DCF77 or IRIG-B time format) synchronized on GPS. The BME P58 •••• CPU, BM• CRA 312 10 module, and AVEVA Plant SCADA / OFS need to be synchronized on GPS.

The unique time reference can also be an NTP server (dedicated high accuracy hardware like a Gorgy Timing LEDI Network NTP Server for example) that provides the IRIG-B 004/5/6/7 or DCF77 time code for BMX ERT 1604 T synchronization. In this case, the GPS usage is not mandatory.