At source time stamped events online change service is not available.

A maximum of 5000 internal variables are managed per Modicon M580 CPU.

No selection of transition edges: Events detection is processed on both value change edges (rising and falling).

A Modicon X80 Ethernet RIO drop supports up to 36 expert channels. A BMX ERT 1604 T module is counted as 4 expert channels.

In a Modicon M340 local drop, the maximum number of BMX ERT 1604 T modules depends on the local drop CPU type. For more details, refer to Modicon X80, BMXERT0604T Time Stamp Module, User Guide.

In an M580 application, the number of BMX ERT 1604 T modules per application is limited to 25.

A maximum of 256 discrete I/Os are managed per BM• CRA 312 10 module.

A maximum of 144 discrete inputs per Modicon M340 PLC (local drop) are managed. 128 discrete inputs can be managed by BMX P34 2000/2010/2020 processors.

System time stamping solution does not support the CCOTF function.

In a Modicon M580 safety project:

• The SAFE task does not support time stamping of internal variables by the CPU.

• The BM•CRA31210 adapter module can time stamp inputs and outputs of safety digital I/O modules located in remote I/O drops.

• The M580P58••••S safety CPU cannot time stamp digital inputs and outputs of safety digital I/O modules located in the local rack.

2 OFS products, running on HMI and SCADA for example, cannot access simultaneously the same time stamping source. A reservation mechanism is implemented to avoid simultaneous access.

A communication path between OFS and the time stamping sources is mandatory to manage at source time stamping solution. If routers are placed in the communication path, they have to be set accordingly.

The system time stamping of internal variables requires the PLC must be configured in periodic mode (it is not possible to time stamp variables in cyclic mode).

SCADA redundancy is compatible with system time stamping.