Technical data

SIMATIC ET 200iSP 29
SIMATIC ET 200iSP
The intrinsically safe variant for hazardous areas
ET 200S with redundant PROFIBUS connection
ET 200iSP can be used in areas subject to explosion
hazards with a gas or dust atmosphere:
■ The ET 200iSP station can be installed in Zones 1, 21 and 2,
22.
■ The connected sensors and actuators can also be located in
Zones 0 and 20.
Communication between the field devices and the process
control system or automation system is performed over
PROFIBUS DP. This considerably reduces the wiring outlay. The
terminal blocks commonly used today, as well as the neces-
sary distribution boards and Ex isolating transformers for the
signals, can be omitted.
PROFIBUS DP has established itself as the standard bus in the
field level right up to hazardous areas. This open and system-
wide communication keeps the solution flexible and also open
to other manufacturers. International standardization of
PROFIBUS DP also ensures future protection to the customer
for investments that are often considerable and intended to
last for many years.
ET 200iSP supports high availability of the system thanks to
■ Configuration during normal operation
■ Hot swapping
■ Redundancy
During normal operation
■ stations can be added,
■ stations can be expanded with modules, and
■ module parameters changed.
The independent wiring supports easy, reliable replacement of
modules during normal operation. Hot swapping of the power
supply is possible without arcing. PROFIBUS DP and/or the
power supply can also be redundantly implemented.
HART support
ET 200iSP offers the HART protocol for connecting process de-
vices with HART capability. These HART modules also support
the transfer of auxiliary variables. Apart from the actual mea-
sured value, up to four IEEE variables can be transferred in the
process image. By means of a routing function, a central sta-
tion can access the HART process devices transparently over
PROFIBUS DP. A higher-level control system can therefore per-
form central data administration.
The process devices are connected by means of a 4 to 20 mA
analog signal. Further device information is transferred over a
modulated signal:
■ Parameters that are specified by a central engineering
station (routing)
■ Diagnostics data that are read by the engineering station
This principle is called HART (Highway Addressable Remote
Transducer). The majority of process instruments, e.g. for tem-
perature, level, pressure or flow measurements, have HART
connections.
Powerful diagnostics with SIMATIC PCS 7
With SIMATIC ET 200iSP, numerous items of diagnostics infor-
mation are generated when internal and external faults occur,
e.g. on open-circuit or short-circuit.
The HART status of the connected HART field devices such as
maintenance and additional information is mirrored in the
diagnostics and signaled to the host control system. Standard
diagnostics drivers are available for SIMATIC PCS 7 for the diag-
nostics messages. These drivers prepare all the relevant sig-
nals for the higher-level PCS 7 operator system.
The detected faults are transferred quickly to the higher-level
systems and support online diagnostics from a central point at
any time.
A watchdog module monitors the ET 200iSP by means of
■ targeted reading or writing of I/O data
■ Reading an input that switches (toggles) with a constant
frequency
■ Provision of an intrinsically safe power supply for the deac-
tivation signal of the digital outputs
© Siemens AG 2007