西门子PLC模块6ES7505-0RA00-0AB0
西门子PLC模块6ES7505-0RA00-0AB0
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集成Protocols
IEC protocol 60870
IEC 60870-5-101, -104 are standardized, vendor-independent telecontrol protocols. They enable remote communication via both conventional and IP-based WANs. The following modules are offered for implementation of an RTU with IEC 60870 based on SIMATIC: CP 1243-1, CP 1243-8 IRC, CP 1243-7 LTE, CP 1542SP-1 IRC, TIM 1531 IRC as well as the compact RTU3000C module.
Possible operating mode in the IP-based WAN:
Spontaneous mode / event-driven
DNP3 protocol
The DNP3 protocol (Distributed Network Protocol) is a standardized, manufacturer-independent telecontrol protocol. It enables remote communication via both conventional and IP-based WANs. The following modules are offered for implementation of an RTU with DNP3 based on the SIMATIC:
CP 1243-1, CP 1243-8 IRC, CP 1243-7 LTE, CP 1542SP-1 IRC, TIM 1531 IRC, TIM 3V-IE DNP3 and TIM 4R-IE DNP3 as well as compact module RTU3000C.
Possible operating mode in the IP-based WAN:
Spontaneous mode / event-driven
Possible operating modes in the conventional WAN:
Polling
SINAUT ST7 protocol
SINAUT ST7 enables SINAUT communication via both conventional and IP-based WANs. The following modules are offered for implementation of an RTU with SINAUT ST7 based on the SIMATIC:
CP 1243-8 IRC, CP 1542SP-1 IRC, TIM 1531 IRC, TIM 3V-IE, TIM 3V-IE Advanced and TIM 4R-IE as well as compact module RTU3000C.
Possible operating mode in the IP-based WAN:
Spontaneous mode / event-driven
Possible operating modes in the conventional WAN:
Polling
Polling with time slot procedure
Operating modes
Spontaneous operation in the IP-based WAN
For transmission via an IP-based network, a permanent TCP connection is established in each case between two RTUs or between one RTU and the control center. Both partners exchange protocol-specific data packets over it using the TCP/IP transport protocol. Spontaneous mode here means that the data is usually sent to the communication partner immediately and without a request (polling). However, the spontaneous data can also be sent with a delay in order to achieve optimum and efficient data transmission. This may be important if networks subject to fees are used and the transferred data volume plays a role.
Networks without volume tariff:
When data is transmitted, it is transferred immediately to the respective partner regardless of any priority. Data is transferred in accordance with the FIFO principle. This does not apply to frames with "interrupt" priority. These are sent before any other frames that may still be in the buffer.
Networks with volume tariff:
In an IP-based network, such as the mobile network, the priority of the individual data frames (normal, high or interrupt) is taken into account. Data with normal priority is collected and transmitted in larger blocks, as soon as a specific size of block is achieved or when the specified TCP/IP keep-alive interval has expired. This saves transmission volume because a reduced frame overhead and fewer acknowledgment frames are required. important data with high or interrupt priority is transmitted immediately. Normal frames that are buffered at this point are sent at the same time. frames with normal or high priority are transmitted in accordance with the FIFO principle.In polling mode, data exchange is controlled from the control center. It calls the connected stations (including node stations) in sequence. Terminals with modified data send this data as soon as they are called. Terminals with no modified data at the present time simply acknowledge the call. Data from the control center to the stations can be transferred at any time between the individual calls.
The ST7 protocol supports direct data transmission between stations. During this type of communication, data is always exchanged via the polling control center TIM.Polling with time-slot procedure mode is used on a wireless network on which the use of the radio frequency assigned by the registration authorities has to be shared with other operators. Typically, each operator has six seconds per minute to exchange data with its stations. once this time has elapsed, the frequency must be enabled for the next operator. During the allocated time slot, this type of polling operates in the same way as standard polling.
The ST7 protocol supports direct data transmission between stations. During this type of communication, data is always exchanged via the polling control center TIM.
Network configurations and topologies
All networks and all transmission media can be combined in any way in a telecontrol project – both with each other in "node structures", as well as in parallel in star topologies or in redundant configurations.
The graphics below show a selection of different topologies that can be implemented with the telecontrol components.
Basic topologies
Differently structured telecontrol networks can be implemented in the wide area network (WAN) based on the following four basic topologies.
G_IK10_XX_30290
Media versions
Depending on the support provided by the selected telecontrol protocol, various transmission media are available for these basic topologies, for example, dedicated line, private wireless networks, mobile wireless networks, dial-up networks (wireless/landline), DSL over Internet.
Some of these media versions are shown here using the example of the star topology.
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Combinations of basic topologies and media versions
Through a combination of several basic topologies of the same or different media versions, it is additionally possible to design more complex network topologies, even with redundant communication paths. This allows optimum adaptation to process requirements and to the existing infrastructure.
