Components Performances
The following table sums up component performances in a time stamping solution:
Topic |
Device |
Value |
|---|---|---|
Time stamp resolution (between 2 identical source modules) |
BMX ERT 1604 T |
2 ms < time stamp resolution < 4 ms (with the same time source) |
BM• CRA 312 10 |
10 ms |
|
Time stamp resolution (in the same source module) |
BME P58 •••• |
CPU MAST task scan time |
BMX ERT 1604 T |
1 ms |
|
BM• CRA 312 10 |
1 cycle time (<10 ms) |
|
Maximum number of I/O and available memory (1.) |
BME P58 •••• |
5000 internal variables |
32000 events in internal buffer (2.) |
||
BMX ERT 1604 T |
16 discrete inputs on the module |
|
255 groups in internal buffer (a group is a set of 1 to 16 events detected in the same cycle) (2.) |
||
BM• CRA 312 10 |
256 discrete I/O configured |
|
4000 events in internal buffer (2.) |
||
1. The maximum value depends on the global system performance, it is not an absolute value and has to be balanced. 2. The number of events in internal buffer includes SOE_UNCERTAIN events. |
||
System Limitations
The following table sums up system performance in a time stamping solution:
Topic |
Description |
Value |
|---|---|---|
Maximum number of BMX ERT 1604 T modules in a Modicon M580 local drop. |
BMX ERT 1604 T |
9 per drop |
Maximum number of BMX ERT 1604 T modules in a Modicon M340 local drop. |
BMX ERT 1604 T |
9 per drop |
Maximum number of devices in an Ethernet remote I/O drop. |
BMX ERT 1604 T |
9 per drop (1.) |
BM• CRA 312 10 |
1 per drop |
|
Maximum number of BME NUA 0100 modules in a Modicon M580 local rack. |
BME NUA 0100 |
2 per rack |
Maximum number of devices in the drops controlled by the same PLC and connected to the Ethernet RIO network. |
BMX ERT 1604 T |
25 |
BM• CRA 312 10 |
31(2.) |
|
Maximum number of sources of events polled by OFS. |
A BME P58 •••• CPU, BMX ERT 1604 T module, or BM• CRA 312 10 module count as 1 source |
500 sources per second (3.) |
Maximum discrete I/Os per PLC |
2500 (2.) |
|
OFS polling rate. |
Minimum OFS polling rate value |
250 ms |
BME NUA 0100 polling rate. |
Minimum BME NUA 0100 polling rate value |
250 ms |
Maximum number of discrete inputs (and outputs) monitored by the PLC for all the time stamping modules. |
For all the BMX ERT 1604 T |
400 discrete inputs (2.) |
For all the BM• CRA 312 10 |
2048 discrete I/Os (2.) |
|
1. A BMX ERT 1604 T module contains 4 expert channels. A Modicon X80 drop supports a maximum of 36 expert channels, so it supports a maximum of 9 x BMX ERT 1604 T modules if there is no BMX EHC 0•00 counting module in the drop. 2. The maximum value depends on the global system performance; it is not an absolute value and has to be balanced. 3. The maximum value depends on the CPU capacity and usage of the PC that hosts OFS and I/O server. It is recommended to avoid installation of other CPU or memory consuming applications on this PC. |
||
AVEVA Plant SCADA I/O Server Performance
Each AVEVA Plant SCADA I/O server communicate with 1 OFS.
The following table provides maximum values recommended for a single AVEVA Plant SCADA I/O server:
Topic |
Value |
Comment |
|---|---|---|
Maximum number of transitions per second. |
10000 transitions per second |
Recommendation for a single I/O server. |
Maximum number of transitions on variables mapped on time stamped events per second. |
3000 transitions per second |
Recommendation for a single I/O server. |
Maximum storage buffer size of the I/O server. |
300000 variables |
|
Maximum storage time of the I/O server. |
10 minutes |
|
Maximum switchover time in a redundant architecture. |
4...10 s for 10000 active variables |
NOTE: The time stamped
event source buffers may become full during an I/O server switch due
to the switchover time.
|