PC-NOV22-PG08-09.1_Layout 1 14/11/2022 08:57 Page 9
COMMUNICATIONS & NETWORKS
Figure 2: The HART-IP protocol operating over Ethernet-APL flattens the industrial control
network, ensuring properly credentialed hosts can securely interact with field devices. All images supplied by FieldComm Group
few bytes. HART-IP continues this concept by providing efficient data payloads without the huge overhead needed by some other protocols. HART-IP is more than fast enough for process control applications, and does not require TSN or the additional effort of scheduling communications. HART-IP works over Ethernet-APL for newer
installations, but it is independent of the underlying media, so it can also work with redundant configurations, such as mesh and ring technologies, and at any network speed. HART-IP simplifies and flattens the control network, avoiding problematic data- passthrough issues (Figure 2). Multiple properly-credentialed hosts – including controllers, asset management applications, and more – can independently and securely access field devices for real-time control, measurement, configuration, and diagnostics. Users of HART-IP retain their investments in
HART installations. Existing assets work seamlessly with new installations and can be upgraded incrementally when it makes economic and operational sense. Asset management and other tools currently using
HART data can easily integrate HART-IP data since the data model is shared with HART and WirelessHART. New designs reap the full benefits of HART-IP over Ethernet-APL. Data Model – The third enabling technology
is the Process Automation Device Information Model (PA-DIM), which is a protocol-agnostic communication specification. PA-DIM organises automation instrument parameters to follow a structured hierarchy, ensuring instruments can be easily used among multiple software tools and protocols. Originally developed as a collaboration between OPC Foundation and FieldComm Group, there are now six additional organisations working together in the development of this standard so that machine-readable data is available for all
forms of analytics and computing, regardless of media, protocol, or field device supplier. PA- DIM offers a structured data model to support monitoring, optimisation, and cloud use cases while also benefitting the on-premises user with common tools for differing protocols. Considering the significant investment by
many users in HART and WirelessHART, there are many reasons for them to leverage their valuable expertise. Designing new and retrofit systems to use HART-IP over Ethernet-APL helps users achieve these goals. Compatibility with the PA-DIM information model ensures compatibility among the many makes and models of field devices and hosts.
FHS-OCT19-ROTECH.qxp:Layout 1 11/10/2019 15:53 Page 1
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