KCD2-SCS-Ex2.SP| Pepperl+Fuchs

Valve Positioner Control and Monitoring with Only One Device

The First 2-Channel Isolated Barriers for Analog Signals

Pepperl+Fuchs has expanded its portfolio of K-System
isolated barriers for DIN rail mounting (power rail) with
the KCD2-SCS* interface module. As the first 2-channel
AI/AO intrinsic safety barrier with dual function, the module
can be configured individually for analog input or analog
output control signals. With a compact 12.5 mm housing
and a packing density of 6 mm/channel, the new module
enables space-saving integration in the control cabinet.
These interface modules are HART-compatible and can
be used both as SMART transmitter power supplies for
two-wire transmitters and as SMART current drivers for
valve positioners. The module can be operated on the control
side in both current sink and current source mode, with the
switchover being carried out using dip switches on the front
of the module. This considerably extends compatibility
with a wide range of control systems.

Compact Design, Configurable Channels

A completely new feature for modules of this type is that
each channel is configurable to allow positioner control on one
channel (AO), and position monitoring (AI) on the second channel.
Positioners ensure that the actuator is brought into a position
specified by the control system. They are often equipped with analog
position indicators whose feedback confirms that the position specification
has been performed. These can be, for example, stroke or rotation angles,
which are typically provided as 4–20 mA signals and reported back to the
control system. Previously, a separate isolator module was required for
the input and output signal. With the new module now available, these
two functions can be used in one device for the first time. If the modules
are no longer required for their original signal journey when changes
are made to the system, they can continue to be used elsewhere in the system
thanks to their configurability. This optimizes warehousing and ensures
investment security.

The KCD2-SCS* is an intrinsic safety barrier that can be used for hazardous
area applications (approved to ATEX, IECEx, and UL). A version for non-Ex
signal conditioning in safe area applications is also available. For each version,
there is an option of screw terminals or spring terminals with push-in connection
technology. The modules are also certified up to SIL 2 (SC 3) in accordance
with IEC/EN 61508 and are therefore suitable for safety applications up to SIL 2,
and even up to SIL 3 when used redundantly.

Common applications for the KCD2-SCS* modules in the process industry include
process control applications that have both analog input and analog output control
loops, safety systems (SIS and ESD) that require SIL 2- or SIL 3-rated intrinsic safety
barriers, as well as control loops located in hazardous areas.

Convenient Installation on a Power Rail

The KCD2-SCS* devices are part of the K-System, which comprises a total of more
than 200 isolated barriers and 150 signal isolators. The modules are mounted on a
universal power rail. The devices are also supplied with power via this mounting rail
profile with insert.

Highlights of the KCD2-SCS* Modules
Universal 2-channel devices for analog input and output signals
Each channel can be configured individually as input or output
Functions: Transmitter power supply for 2-wire transmitters,
current driver for positioners
Current sink and source on control side for analog input signals
Ex certifications: ATEX, IECEx, UL
Functional safety: SIL 2 (SC 3) acc. to IEC61508 ed2 (TÜV Rheinland)
Ambient temperature: -40 °C … +70 °C (-40 °F … +158 °F)
HART-transparent

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