Max Num of PLC in a Driver

[xavi.aran]

Actulally i have a project with 1 modbus driver. In this driver i have 26 PLCs.
When i start the project the last 2-3 PLC's doesnt connect correctly and remains disconnected.
i need to desactivate and activate the PLC for solve this problem and works correctly.

It's normally? i have more PLC connected to a driver than its the normal number?

I need to configure a second driver modbus and distribute the 26 PLCs?

[leoknipp]

the Modbus driver can handle more than 26 PLCs. In other projects the Modbus driver is connected to more than 100 PLCs.
Which WinCC OA version and operating system are you using?
Do you get log message when connecting the PLC fails?
Can a high CPU usage be observed if the problem occurs?

Best Regards
Leopold Knipp
Senior Support Specialist

[xavi.aran]

Hi Leopold, i write the information you ask me:

WinCC OA 3.13 Patch13 Linux x86_64

[winccuser@MSTCE2 ~]$ hostnamectl

Static hostname: MSTCE2
Icon name: computer-server
Chassis: server
Machine ID: d19f861ac32c497e83f5abe946068657
Boot ID: bb15bafd02594c1684aa1ab6ff154b23
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-327.13.1.el7.x86_64
Architecture: x86-64

I have 26 PLCs, after the start the first nine PLCs appear with communication failure without registering any errors in the logs. The only differential data that I appreciate is the PLC error for these stations [Error Code = 2] when for the rest it is 0.

To recover this situation you have to deactivate / activate each PLC, still keeping Error Code = 2 in them.

You are right, the cpu of the WCCOAmod process is kept 100% for a long time until it has just started, this may be the problem.

An important fact: the driver takes more than 30 minutes to start.

[alug]

How many addresses are in the project?
Are there a lot of addresses with subindices!=0, because for such addresses we fixed a performance
Problem recently in Version 3.14?

[xavi.aran]

we have 90.775 addresses aprox. distributed in 26 PLCs.

Aprox 80.000 of these addresses are binary and have subindex != 0.

Do you think we need to upgrade to 3.14 to solve this problem? The licenses for 3.13 work too in v3.14?

[leoknipp]

If the license for 3.13 also works in 3.14 depends on the values for the keywords "version" and "update".
If update is 1 or 2 the license can be used with newer versions than defined at the keyword version, e.g. 31400002 is a license for version 3.14.

Best Regards
Leopold Knipp
Senior Support Specialist

[xavi.aran]

My license has versión 31300002 and update 0...it can works in v3.14?

For solve my problem, is a good idea configure 1 or 2 Modbus Drivers more and distributed the PLC's in the 2 drivers?

Or the only solution is update to v3.14?