Siemens MindConnect IoT2040 - Quality Codes Modbus Protocol

Reading data from a data provider will always cause an effect on it. The
performance of the data provider (PLC / OPC Server / Modbus) is one of the
most important limiting factors. If more devices (e.g. OPC server, HMIs, SCADA
systems,...) are connected to this data provider (e.g. PLC) the reading cycle can
rise.
For MindConnect Software Agent, the readings are not applicable as it depends
on the hardware for a particular agent and configuration.
System Test results
The following tables show how long it takes to read a data item from one of the devices. These
are not fixed values but an indication of how the devices would react.
MindConnect IOT2040:
Type
MS per data point read:
Min
MS per data point read:
Mid
MS per data point read:
Max
S7 300 2,10 4,28 6,61
S7 1500 3,73 4,54 5,22
S7 1200 6,29 6,72 7,11
S7 ET200S
CPU
1,92 5,01 8,33
OPC UA @ PC
OPC UA@ PLC 4,42 5,50 7,66
Read of a string data point you have to multiply the time with 2,5 per data point
All devices are around 75% full
8.11 Firewall Settings
It is recommended to use a firewall between the Internet and the MindConnect IoT2040, this is
also recommended for communication to the automation network.
In the direction to Automation Network a firewall supporting NAPT (in case of DMZ, see section
“List of abbreviations”) or supporting the “Ghost-Mode” is required. Siemens offers many types
Appendix
8.11 Firewall Settings
MindConnect IoT2040
System Manual 8/2023 114