WinCC/TeleControl производства Siemens

Telecontrol communication over the wide area network is largely determined by the communication infrastructure which already exists. Various transmission media such as dedicated line, analog or digital telephone networks, wireless networks (GSM or private), DSL or GPRS can also be combined with each other.

SINAUT ST7 telecontrol protocol

Detailed information for implementing telecontrol applications with the SINAUT ST 7 telecontrol protocol via the Industry Mall.

IEC 870-5-101/-104 telecontrol protocols

Detailed information for implementing telecontrol applications with the IEC 870-5-101/-104 telecontrol protocols via the Industry Mall.

DNP3 telecontrol protocol

WinCC/TeleControl for WinCC V7.0 SP2 also supports the DNP3 telecontrol protocol. Widely distributed outstations (RTUs) can be controlled and monitored with the DNP3 telecontrol protocol via serial or Ethernet TCP/IP communication links by means of the telecontrol center in SIMATIC WinCC. The control center integrated with SIMATIC WinCC TeleControl into the SCADA system is the master during telecontrol communication. The slaves are represented by the outstations. SIMATIC S7-300/S7-300F and S7-400/S7-400F/S7-400H/S7-400FH controllers as well as third-party RTUs can be used as outstations.

Further hardware and software components round off the range of products:

• TIM communication modules
• TCP/IP converters – serial and MD modem modules
• GSM/GPRS components
• TCP/IP routers and switches
• SCALANCE S612 and S613 security modules
• Dedicated-line accessories
• Cables
• Engineering package for configuration of DNP3 data objects, stations, networks and connections as well as for diagnostics

In order to implement telecontrol networks, basic topologies including point-to-point, multi-point, star and ring can be configured using classic or TCP/IP-based media. These can be combined flexibly independent from existing infrastructure.

Classic WAN media:

• Dedicated line via modem, e.g. SINAUT MD2
• Private wireless networks
• Analog telephone network
• Digital ISDN network
• Mobile radio network GSM

TCP/IP-based WAN media:

• Ethernet networks, e.g. SCALANCE X with fiber-optic cables
• Industrial Wireless LAN with SCALANCE W
• Public networks and the Internet using DSL and/or GPRS

WinCC/TeleControl for WinCC V7.0 SP2 cannot only integrate newly configured RTUs, it can also integrate units which already exist in outlying areas by means of DNP3 or IEC 870-5-101/104 drivers.

For communication with the outstations, WinCC/TeleControl for WinCC V7.0 SP2 uses the SINAUT ST7 and DNP3 protocols (both via serial and TCP/IP communication connections) as well as IEC 870‑5‑101 (serial) and IEC 870‑5-104 (Ethernet TCP/IP).

The serial RTU link is possible via the following components, which can be connected directly via WinCC (single station or server):

• SINAUT TIM communication modules (SINAUT ST7 telecontrol protocol)
• TCP/IP serial converter (telecontrol protocols DNP3, Modbus (not released for WinCC TC), IEC 870-5-101)

Equipment from MOXA or Lantronix, for example, can be used as TCP/IP serial converters.

By means of Ethernet TCP/IP, the RTUs can be connected directly or via TCP/IP WAN routers to the SIMATIC WinCC system bus (SINAUT ST7, DNP3, IEC 870-5-104 telecontrol protocols). When using the SINAUT ST7 telecontrol protocol, the SINAUT TIM communication module can be used in addition to the TCP/IP WAN router or as an alternative.

Special characteristics of DNP3 communication

• Change-driven data transmission
  • Change-driven transmission of process data between RTU and control center
  • Signaling of RTU, control center or connection failure
  • Automatic data updating for all communication partners involved following troubleshooting and following the startup of the RTU or control center
• Chronological processing of process data
  • Time tagging of all data frames at the place of origin allows process data to be archived by the process control system in the correct chronological order
  • The time of the DNP3 stations in the WAN can be synchronized via SIMATIC WinCC (including summertime/wintertime switchover)
• Local data storage
  • The TIM communication module can temporarily store (for several hours or even days) message frames should the connection or the communication partner fail
  • Intermediate storage of message frames of lower priority in the case of priority-controlled data transmission (with dial-up networks or quantity-dependent data transmission costs)

Operating modes

The DNP3 telecontrol protocol supports the following operating modes:

• Polling
• Polling with time slot procedure
• Multi-master polling with time slot procedure
• Spontaneous mode in dial-up networks
• Spontaneous mode in the TCP/IP-based WAN

Integration of WinCC/TeleControl for WinCC V7.0 SP2 into the WinCC SCADA system offers particular advantages for the water and waste water sectors, as well as oil and gas sectors, especially in the case of the following types of plant:

• Freshwater treatment and distribution
• Wastewater treatment plants
• Oil and gas pipelines and water pipes
• Oil and gas drilling fields and the associated treatment plants
  

In these types of plant, remote outstations such as pumping stations, valve stations or automated stations for wellheads must be integrated.

Through the support of communication protocols for RTUs such as SINAUT ST7, WinCC/TeleControl for WinCC V7.0 SP2 supports the following advanced communication concepts:

• Reduction in the transferred data volume by means of event-controlled communication mechanisms for alarm and measured value information.
• Time-synchronization of RTUs and correct time stamping of all data in the RTU.
• Tolerance of lower bandwidth, high latency or lack of reliability of communication lines
• Prevention of data loss due to communications failure through data backup in the RTU
• Support of communication media with serial interface (dedicated lines, dial-up connections over analog telephone lines and ISDN lines), various radio devices (standard, spread spectrum modulation), microwave and GSM
• Support for TCP/IP-based WANs (Wide Area Networks) such as DSL, GPRS or Ethernet radio networks
• Support for redundant communication connections
• Expanded communication diagnostics functions for RTU communication links
• Remote programming of RTUs
• Support for different communication topologies – Point-to-point, multidrop (multistation mode) and hierarchic network structures
• High quality server redundancy scheme without data loss in the case of server failure
  

Through the support of communication protocols for RTUs such as IEC 60870-5 and DNP3, SIMATIC TeleControl for WinCC V7.0 SP2 supports the following advanced communication concepts:

• Reduction in the transferred data volume by means of event-controlled communication mechanisms for alarm and measured value information.
• Time synchronization of RTUs and correct time stamping of all data in the RTU.
• Tolerance of lower bandwidth, high latency or lack of reliability of communication lines
• Prevention of data loss due to communications failure through data backup in the RTU (not all non-Siemens RTUs support this)
• Support of communication media with serial interface (dedicated lines, dial-up connections over analog telephone lines and ISDN lines), various radio devices (standard, spread spectrum modulation), microwave and GSM
• Support for TCP/IP-based WANs (Wide Area Networks) such as DSL, GPRS or Ethernet radio networks
• Support for redundant communication connections
• Expanded communication diagnostics functions for RTU communication links
• Remote programming of RTUs
• Support for different communication topologies – Point-to-point, multidrop (multistation mode) and hierarchic network structures
• High quality server redundancy scheme without data loss in the case of server failure
  

Outstations/remote terminal units

WinCC/TeleControl for WinCC V7.0 SP2 supports the following preferred outstations for local distributed automation:

• Controller integrated into ET 200S (IEC 870-5-101/104 telecontrol protocols); for cost-sensitive applications, up to approx. 30 I/O signals or approx. 200 data points
• S7-300/S7-300F controller (SINAUT ST7, DNP3, IEC 870-5-101/104 telecontrol protocols); for extremely flexible configuration, up to 100 I/O signals or approx. 2000 data points
• S7-400/S7-400F controller (SINAUT ST7, DNP3, IEC 870-5-101/104 telecontrol protocols); up to 500 I/O signals or approx. 5000 data points
• S7-400/S7-400F redundant controller (IEC 870-5-101/104 and DNP3 telecontrol protocols); up to 500 I/O signals or approx. 5000 data points
• Third-party station with the IEC 870-5-101/104 and DNP3 telecontrol protocols (depending on type of station)
  

The following table provides an overview of the current options for connecting to these outstations:

¹⁾ Data buffering is limited to two SIMATIC S7 data blocks. Depending on the SIMATIC CPU, this corresponds to approx. 800 to 3200 buffered frames.

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