Looking for SYSTEM-PKI Companion Document Described in "MODBUS/TCP Security" Specification

Hi,

I have gone through the Modbus TCP/IP Security protocol specification (MB-TCP-Security-v21_2018-07-24).

In this document (under section 9 System Dependencies), it is mentioned that [System-PKI] companion document includes recommendations that mbaps devices may need to place on the local PKI system for their successful deployment and operation.

I could not find the [PKI-System] document on modbus.org. Please let me know where to find this document.

thanks,
Nandkishor
 
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