AC500 HA redundancy configuration
want to know what is the difference between AC500 HA with ‘COM1 – CS31-Bus ,CI59 and ModTCP .
what is the advantages and disadvantages of each way.
Any supportive manual and Application example for the Modtcp with CI521 or CI522
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Two HA solutions are available now.
1. HA CS31 : this supports CS31 bus for IO modules. This solution is available for quite some time.
2. HA Modtcp : this is new version of HA which supports modbus tcp , it means all IO will be connected using Modbus tcp.
some advantages of Modbus TCP
a. there is no limit of number of CI modules. it is scalable and depends on CPU capabilities.
b. it is faster than CS31
c. It is available in codesys V2 and V3.
Once you install AB , you can find example and related documents at