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Siemens IK PI · 2015
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Design
(continued)
Industrial Remote Communication
TeleControl Professional for the control center
PCS 7 TeleControl
7
The WAN transmission media suitable for communication
between the RTUs and the telecontrol center are diverse, e.g.
•
Private networks
- Wireless
- Dedicated line
- WLAN
•
Public networks
- GPRS
- EGPRS
- UMTS
- DSL
Based on the four basic topological forms (point-to-point, multi-
point, star and ring), differently structured telecontrol networks
can be implemented with these media versions, e.g. star over
wireless, dedicated line or DSL. Through a combination of
several basic topologies of the same or different media versions,
it is also possible to design more complex network topologies,
even with redundant communication paths. Optimum adaptation
to the local conditions and the infrastructure which may already
exist is possible in this manner.
Migration of existing telecontrol systems
SINAUT ST1 stations based on SIMATIC S5
In the course of migration of existing plants, RTUs based on
SIMATIC S5 can also be integrated via SIMATIC PCS 7
TeleControl into the process control system. In the process,
the ST1 telecontrol protocol is converted into the ST7 protocol
in the central TIM communication module.
Units with Modbus RTU communication
Existing plant sections that have a Modbus infrastructure,
even those outdoors, can be integrated into SIMATIC PCS 7
using SIMATIC PCS 7 TeleControl. These sections can be
integrated into SIMATIC PCS 7 using the Modbus RTU protocol
via serial lines or TCP/IP connections.
Whereas RTUs with Modbus TCP/IP interface can be integrated
directly, third-party RTUs require special interface converters for
telecontrol communication.
Third-party stations with telecontrol protocols
In addition to the Modbus RTU telecontrol protocol, the
DNP3 (serial and TCP/IP), IEC 60870-5-101 (serial) and
IEC 60870-5-104 (TCP/IP) telecontrol protocols also support
the control center interfacing of third-party RTUs in the course of
migration. A prerequisite is that the RTU supports the corre-
sponding protocol and that the required interface converters
are available.
Third-party stations with OPC
Third-party RTUs for which an OPC server exists can be inte-
grated into the process control with the PCS 7 TeleControl oper-
ator system using additional engineering services on the basis
of the DBA technology. SIMATIC PCS 7 TeleControl then sup-
ports data exchange between the operator system (OPC client)
and the RTU (OPC server) per OPC DA.
SINAUT LSX systems
Existing SINAUT LSX systems can also be migrated with
SIMATIC PCS 7 TeleControl. The SIMATIC S7 controllers with
the EDC telecontrol protocol (Event Driven Communication)
installed in the SINAUT LSX system are integrated into
SIMATIC PCS 7 TeleControl with PCS 7 TeleControl S7 EDC
drivers (for ordering data, refer to the following catalog section
PCS 7 TeleControl operator system). Because the SINAUT LSX
system can coexist at all levels next to the new system architec-
ture as long as necessary, step-by-step modernization is
possible without short-lived intermediate solutions.
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Mode of operation
With SIMATIC PCS 7 TeleControl, the outstations can be inte-
grated into SIMATIC PCS 7 so that the operator notices no differ-
ence between central or remote automation with regard to the
operating philosophy and alarm response.
The OS clients of the client/server multi-user system are able to
display data from RTUs and SIMATIC PCS
7 automation systems
(AS) – which they receive from a server with dual-channel func-
tionality or from two separate servers - together in one process
image. Display is primarily on faceplates for process objects
such as motors, valves etc., but also by means of trend curves
and messages.
If the PCS 7 TeleControl OS server is of redundant design, the
redundant pair of PCS 7 TeleControl OS servers matches all
internally generated information, e.g. alarm states and results of
calculations.
The communication mode between the control center and RTU
depends on the type of WAN, the configuration of the telecontrol
communication, and the support by the telecontrol protocol.
The operating modes available with the SINAUT ST7 telecontrol
protocol are described, for example, in the section "Industrial
Remote Communication", "TeleControl Professional, Introduc-
tion" of Catalog IK PI ("Industrial Communication SIMATIC NET").
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Function
Conditioning and display of data on the PCS 7 TeleControl OS
(single stations/servers) are carried out by SIMATIC PCS 7
TeleControl blocks present in a library. These blocks support
operator prompting in conformance with SIMATIC PCS 7 using
symbols and faceplates, and also the hierarchy of the
SIMATIC PCS 7 alarms.
In addition to blocks for processing of process data, the library
also contains blocks for diagnostics and control of communica-
tion. If necessary, the supplied basic library can be extended
using the DBA Type Editor by new script-based block types
specific to the project.
Engineering can be automated efficiently and in conformance
with SIMATIC PCS 7 using the DBA technology. DBA supports
plant expansion during ongoing operation, and facilitates
project-specific adaptation of the system as well as importing
of existing configurations in the course of migration.
When linking RTUs by means of the SINAUT ST7, DNP3,
IEC 60870-5-101 or IEC 60870-5-104 telecontrol protocol, the
raw data in the remote stations is provided with a time tag and
transmitted to the PCS 7 TeleControl OS (server/single station)
acting as control center. Adaptation, further processing and ar-
chiving are carried out there. This procedure is appropriate for
the event-based principle of operation of the telecontrol protocol
as well as the subsequent chronological processing of data
which was buffered in the remote station.
The time and date of the remote stations connected per
SINAUT ST7, DNP3, IEC 60870-5-101 or IEC 60870-5-104 can
be synchronized by the PCS 7 TeleControl OS (time master).
Switchover between daylight-saving time and standard time is
also taken into account.
In order to comply with guidelines, statutory directives and
standards it may be necessary to provide special proof, e.g.
proof of conformity with the ATV M260 guideline for sewage
treatment plants. For this we recommend the ACRON software
package equipped with even more functionality for long-term
archiving and logging. ACRON is an add-on product in the
Catalog ST PCS 7 AO (Add-ons for SIMATIC PCS 7).
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More information
Additional information is available on the Internet at:
© Siemens AG 2014