System architectures

Since the HMI Process Library is based on TwinCAT HMI, all scenarios for TwinCAT HMI are accessible for the HMI Process Library as well.

When we take the various options for mapping PLC variables and the flexibility provided by using faceplates into account, there are two main scenarios for using the HMI Process Library from a system architecture point of view: either with or without using TwinCAT MTP PLC Library.

With TwinCAT PLC MTP Library

The HMI Process Library provides controls compatible with TF8400 | TwinCAT MTP Runtime FBs that conform to the MTP Specification. This allows the control to be mapped to just one PLC symbol.

This architecture implies that PLC can also be controlled by POL/DCS.

Without TwinCAT PLC MTP Library

Using the HMI Process Library without the PLC MTP Library gives the user the option to utilize ready-to-use controls with the user’s own FBs for standard and non-standard technological equipment.