Profiles & Classes
- Class 61 Integrated Host -
Class 61 Integrated Host, primary
characteristics are what you would normally associate with a DCS host.
Integrated Hosts are an essential part of the process, and are online or
“on process” hosts. Integrated Hosts set and manage Physical Device
Tags for all devices as well as the network configuration. Integrated
Hosts also manage the distributed application configuration, including
the link schedule, backup link schedule, block instantiation, link
objects, macrocycle, VCRs, and alerts. An Integrated Host provides full
access to all resource block, transducer block, and function block
parameters. It may maintain a backup/off-line database. The Integrated
Host is widely used by many people throughout the plant. Process
control engineers use the host system for configuration and analysis.
Operators have access to the Integrated Host through operator
workstations, while maintenance will use the host through plant asset
management applications. Even management can use the host through other
operations management and application workstations.
- Class 62 Visitor Hosts -
Class 62 Visitor Hosts are basic on-process hosts that may have read
and write access to resource and transducer blocks. However, read-only
access may be provided to function blocks. Visitor Hosts do not manage
the physical device tags, network configuration or distributed
application configuration. Visitor Hosts typically reside in handheld
devices or PDA-like devices that are used for maintenance and have a
temporary connection to the network. Visitor Hosts can also reside in
specialized device applications such as online control valve diagnostic
- Class 63 Bench Hosts -
Class 63 Bench Hosts may set the network configuration for off process
testing, but both Class 63 and 64 Hosts are off process hosts. They may
also set a distributed application configuration, including link
schedule, back link schedule, block instantiation, link objects,
macrocycle, VCRs, and alerts. Class 63 Bench Hosts may also access all
resource block, transducer block, and function block parameters.
Primary users include maintenance and instrumentation personnel. Class
63 Bench Hosts are used for several applications, including testing of
skid operations and setting up a new device for service. You may also
use a Class 63 Bench host for maintenance of a previously configured and
operating device that is removed from the process network or setup of a
new device for device replacement service. If you have a used device
that you want to reassign, you can use a Class 63 Bench Host to clear
the device of any PD_Tag, H1 address, VCRs, LAS and function block
schedules, link objects, and so on.
- Class 64 Bench Hosts -
Class 64 Bench Hosts are primary off-process hosts for access to a
prior commissioned device. A Class 64 Standard Bench Host has nearly
identical requirement to a Class 62 Standard Visitor Host with the
exception of device address configuration. Primary Users of Class 64
Bench Hosts would be instrumentation and maintenance personnel. The
Class 64 Bench Host usually resides in a handheld or PDA-type device
that is connected to an off-process segment or specialized device
application such as offline valve diagnostics.
- Class 71 SIF Integrated Host -
Class 71 SIF Integrated Host is the primary on-process SIF host for
safety applications. Like the Integrated Host, the Class 71 SIF Host
is a fixed H1 address, on-process host. It sets and manages physical
device tags for all devices. It also sets and manages the network
configuration and manages the distributed application configuration, and
provides all the other functionality of the Class 61 Integrated Host.
The difference is the additional SIF-specific functionality.
Safety-specific functionality includes full access to all profiled
SIF-related resource block and function block parameters. It supports
the SIF protocol and maintains the SIF configuration signature, and can
lock and unlock all SIF devices. As a safety system host, primary users
are most likely plant safety engineers for configuration and analysis
applications. Operators and plant management will also use the host
during shutdown operations or for operations management purposes.
Maintenance personnel will interface with the SIF Host for maintenance
of SIF devices and process equipment.
Features of each Host Classification
Click Host Features table below for a full breakdown of Mandatory, Optional and Prohibited features of each host classification.