Siemens S7 Series PLC Equipment Network Monitoring Program - Water Treatment
Now that some factories have such a situation, the number of on-site equipment is relatively large, the project engineering covers a large area, the equipment is scattered, and the workstations are scattered and dispersed. Centralized monitoring and decentralized control have become a networking engineering solution that is popular in automation today. A networked device that implements centralized monitoring and decentralized control—networked gateways
NetLINK's form factor matches the PG programming port of Siemens' S7300/400 controllers. Combined with a programmer's driver (for example, IBH's driver), the Ethernet connection between the controller and programmer can be realized. In this case, NetLINK can be powered by the controller.
And can realize the connection of MPI network through LINK socket of NetLINK Most monitoring systems support OPC technology, moreover, different manufacturers all offer the standard OPC sever, connect through Ethernet interface of NetLINK, in addition, a lot of monitoring software has already integrated RFC 1006 driver, so that you can use NetLINK resume direct communication connection, if NetLINK directly connected to other peripherals, so long can be connected to an external 24V power supply,
Features:
typical application:
one. Network performance comparison
Scheme comparison
Networking with Siemens Ethernet Modules
Using Siemens Profibus module for networking
Networking with netLINK
Network performance comparison:
1. Ethernet is suitable for long-distance communication
2. Most factories already have a local area network that can be used directly
3. Low wiring difficulty and low comprehensive cost
4. Network faults are easy to locate
5. Easy to expand in the future
1.Profibus is not suitable for long-distance communication, weak anti-interference
2. The networking of a large number of devices requires the pre-laying of cables
3. The wiring is difficult and demanding
4 is not easy to expand, difficult to maintain
1. Ethernet is suitable for long-distance communication 2. Most factories already have a LAN that can be used directly
3. Low wiring difficulty and low overall cost 4. Easy to locate network faults
5. Easy to expand in the future
From the above table, it is not difficult to see that scheme 1 and scheme 3 are significantly better than scheme 2 in network performance. Although scheme 1 also has good network performance, its implementation cost is too high, especially for S300 and S400. series. So we can conclude that netLINK is more suitable for networking of factory equipment in terms of network performance.
two. Plug and play ratio
Scheme comparison
Networking with Siemens Ethernet Modules
Using Siemens Profibus module for networking
Networking with netLINK
Plug and play comparison
Does not support Plug and Play, requires re-downloading the program, the device needs to be powered off
Does not support Plug and Play, requires re-downloading the program, the device needs to be powered off
Support plug and play, devices do not need to power off
Compared with the above table, we can draw the following conclusion: The use of Siemens module requires the device source program to achieve networking, but the use of netLINK only need to know the variable address.three. Communication performance comparison
Scheme comparison
Networking with Siemens Ethernet Modules
Using Siemens Profibus module for networking
Networking with netLINK
Communication performance comparison
high speed
Low speed
high speed
From the comparison of the above table, we can see that the adoption of both Scenario 1 and Scenario 3 has a faster communication speed. You may be in doubt because you may think that using Siemens Ethernet modules should be faster than netLINK because Siemens Ethernet modules are direct Ethernet communications, and netLINK is the MPI communication rate. In fact, this view is not complete. Correct, the reason is:
1.Siemens Ethernet module has a separate MPI address, in fact it is also through the backplane and CPU MPI communication
2. The monitoring software of Siemens limits the speed of the upper computer to access the CPU. For example, the fastest update of the variable in WinCC is 100ms.
Therefore, using netLINK to achieve networking communication speed is actually not lower than the Siemens Ethernet module.
four. Software configuration work
Scheme comparison
Networking with Siemens Ethernet Modules
Using Siemens Profibus module for networking
Networking with netLINK
Software configuration work
When a large number of devices are connected to the network, Siemens software needs to be purchased and the configuration is complicated.
When a large number of devices are connected to the network, Siemens software needs to be purchased and the configuration is complicated.
Fast configuration via MS Office, unlimited number of devices on the OPC server, and completely free
By comparing the above table, it is not difficult to draw the following conclusions: The use thresholds for the use of Scenario 1 and Scenario 2 are high, time-consuming and labor-intensive, affecting production, and the use of Scenario 3 is relatively low-cost, networking is easy, and does not affect production.
Fives. PC software development
Scheme comparison
Networking with Siemens Ethernet Modules
Using Siemens Profibus module for networking
Networking with netLINK
PC software development
Needs commercial SCADA software development
Needs commercial SCADA software development
Can use commercial SCADA software development, can also be used VC/VB development
By comparing the above table, it is not difficult to draw the following conclusion: The use of netLINK can develop proprietary software, such as ERP, MES systems.
Summary:
Net LINK 50-MPI is mainly used to solve the engineering networking problem of Siemens S7 series PLCs. It can convert Siemens MPI, DP, and PPI protocols into Ethernet protocols and realize the Ethernet of S7-200, S7-300, and S7-400 series PLCs. Connection, through the Ethernet to PLC internal DB block, counter, timer, Memory, Input, Output and other data monitoring, in order to achieve real-time collection of all the equipment on-site data,
netLINK structure is compact and compact, simple and convenient, cost-effective, no external power supply, plug and play support, field use without stopping the network equipment, can directly monitor the CPU data, while netLINK can also achieve remote download of the CPU program, The on-site engineer can directly modify the program on the spot specified CPU in the master control room, which is very convenient.
In addition, netLINK provides driver API functions to facilitate users to carry out secondary development. Users can use their own high-level languages ​​such as VC and VB to develop their own monitoring software according to the project requirements, and implement monitoring of field devices. And many international and domestic well-known SCADA/SoftPLC software vendors have integrated netLINK driver, can be directly connected
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