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From Jens Maier <>
Subject AW: [DISCUSS] Adding a "ping" method to the API?
Date Thu, 07 Feb 2019 13:03:22 GMT
Hi all,

maybe there is no need for a ping. At the development of our driver we also got sometimes
disconnects without any real issue. At the same issue our driver makes a complete disconnect
at time out and by a configurable retry counter.
After about 5 secs of no communication resume or overrun the counter, the driver signals Connection
Error and answer each reading request with 0 to get no empty values.

We also slow down the communication by Delay, when there was a error and slowly speed up to

With this, we can unplug the cable for undetermined time and at the plug in, the driver continues
with the communication.

If this is interesting, i can post some VB6 code.


Von Outlook<> gesendet.

Von: Markus Sommer <>
Gesendet: Donnerstag, 7. Februar 2019 11:50
Betreff: AW: [DISCUSS] Adding a "ping" method to the API?

+1 from myside.

It's good idea to search for PLCs or to realize an automatic configuration of the communication....

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-----Ursprüngliche Nachricht-----
Von: Christofer Dutz <>
Gesendet: Mittwoch, 6. Februar 2019 11:32
Betreff: [DISCUSS] Adding a "ping" method to the API?

Hi all,

Having had the same problem several times now, I think we might consider solving this …

I’ve had the problem that potential customers say things like “We communicate via S7”
… well the thing is they have an S7, but that doesn’t mean the communication is done in
the native S7 protocol. It could be:

  *   Profinet
  *   S7Pluss (New TIA Version of the protocol)
  *   Modbus
  *   OPC-UA

So what I would like to do, is to add a “ping” method to the connection, that would allow
to try connecting to a given PLC. With this we could write code that for example tries all
supported protocols for a given IP address and reports which ones are enabled.
We could also write a PLC scanner that pings an IP range and tries pinging the different protocols
for each responsive IP address … this would be a huge help for people using PLC4X applications
in the field …

What do you think?

We sort of would need to define “ping” operations for each connection type (Like the “SELECT
1” SQL query in JDBC and JPA).


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