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
PROFINET
Update Rate
(ms)
PROFINET I/O Size (bytes)
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.
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