PLX3x Series ♦ Multi-Protocol Gateways
PND Protocol
User Manual
ProSoft Technology, Inc.
Page 207 of 215
January 25, 2018
10.5 PND Performance
The following tables contain PND performance rates.
EIP Class 1
Connections
RPI (ms)
Number of EIP Class 1
Connections
1
2
3
4
5
6
7
8
2
128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes
256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes NA
NA
496 Bytes 496 Bytes 496 Bytes NA
NA
NA
NA
NA
4
128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes
256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes NA
NA
496 Bytes 496 Bytes 496 Bytes NA
NA
NA
NA
NA
8
128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes 128 Bytes
256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes 256 Bytes NA
NA
496 Bytes 496 Bytes 496 Bytes NA
NA
NA
NA
NA
PROFINET
Update Rate
(ms)
PROFINET I/O Size (bytes)
128
256
512
768
1024
1280
1400
2*
YES
NO
NO
NO
NO
NO
NO
4*
YES
YES
YES
NO
NO
NO
NO
8
YES
YES
YES
YES
YES
YES
YES
Example:
PLX3x gateway sending/receiving 128 bytes of EIP data on a single 4 ms Class
1 connection and PLX3x gateway sending/receiver 128 bytes of PROFINET data
with a 4 ms update rate.
The maximum cycle time is calculated as:
EIP = 4 ms/in + 4 ms/out = 8 ms
PND = 4 ms/in + 4 ms/out = 8 ms
PLX3x latency = 4 ms
Total: 20 ms
To use a 2 to 4 ms update rate, you must use a different GSDML file. This
GSDML is available at www.prosoft-technology.com
Under certain conditions (high network load, low update rate, etc.) the
PROFINET Controller may need to raise the watchdog time.
