PM573-Eth redundancy issue

Dear Sir,

How I can achieve redundancy with PM573-ETH controller and CM597.

Is the redundancy possible with the same PM573-ETH controller?

Even it gives an error, that i forgot to capture is "CPU conflict, Check CPU program very small CPU cycle time and analog comparison may cause errors in the High Availability system, Index of the faulty IEC task, Task index = x-4"

I am able to download and run first controller, and after removing HA feature able to run both controllers (What I am doing to show, everything is OK). But when I use proper redundant program, I am not able to run srcond controller.

Scan time: Main program = 500ms, HA = 100ms

For more information, please see the attached pictures.

 CPU Diagnostics 1.PNG

 CPU Diagnostics.PNG

 CPU Information.PNG

 CPU Parameters.PNG

 CPU Statics.PNG

 CPU Version.PNG

 Different Confg Valu.PNG

 HA Stop-Error.PNG

 hardware Tree.PNG

 Index of faulty Task.PNG

By NLJOSEB on 4/7/2018 | Like (0) | Report

Does your problem resolved? Are you using PM573-Eth for HA Redundancy. I read in one document HA support from PM581 onwards? Does it support PM573-eth?

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asked 3 months ago




Some suggestions as below,

1. The HA program task must be minimum 30 msec or equal to CS31 bus cycle time,whichever is higher

2. The priority of HA task =10 and priority of all other tasks must be unique and greater than 10

3. Set max wait time parameter by determining the maximum time taken for a CI590 module whose CS31 LEDs become steady green the last

4. Set Run on configuration fault to YES for the CS31 bus

5. In CPU parameters,select Balanced Ethernet and File Handling

6. IP addresses specified at the inputs of HA CS31 Control FB must be IPs of the ETH ports to which UDP data exchange protocol is appended

7. In HA program, only Control and Diagnostic FBs must be declared and configured. Data sync blocks, if used ,may be declared in non HA program

From my experience,point 1 should resolve your issues to a large extent. Also,make sure HACS31 CALLBACK stop function is properly configured.




answered 3 months ago


By nitinpulastya on 2/10/2018 | Like (0) | Report

Thanks for your quick reply.
How may I calculate
1. "CS31 bus cycle time"?
2. Value in Point 3

By rahilmohammed on 2/10/2018 | Like (0) | Report


1.Double click on CS 31 Protocol configuration page.3rd tab.This page also provides the total no. of CS31 software modules used.

2.Power Off the panel.Power ON the panel.Start stop watch and observe which is the last CI590 module to have its CS31 A and B Leds` steady green.Use this time to set the Max wait Run parameter in msec.

By rahilmohammed on 2/10/2018 | Like (0) | Report

Stop timer when the CI590 which takes the longest to initialise has its CS31 A B leds` solid green.

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PFA the HA program configuration document available in examples folder at



Cycle time of HA Task=30 msec

Cycle Time of Main Task= Equal to or greater than CS31 Bus Cycle time





answered 3 months ago


By nitinpulastya on 2/14/2018 | Like (0) | Report

Thanks Rahil for your valuable support, I will use the same document.

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