Information technology. Security techniques. Time-stamping services - Framework subscription-only This part of IEC 61131

This part of IEC 61131 specifies syntax and semantics of programming languages for programmable controllers as defined in Part 1 of IEC 61131

Quality management systems in projects includes: project characteristics (4

It also specifies general rules and standards to be applied to the different types of testing

Risk control

Information technology. Security techniques. Time-stamping services - Framework subscription-only This part of IEC 61131A time stamping service provides evidence that a data item existed before a certain point in time. Time stamp services produce time stamp tokens, which are data structures containing a verifiable cryptographic binding between a data item's representation and a time value. This part of ISO IEC 18014 defines time stamping mechanisms that produce independent tokens, which can be verified one by one.