南京西门子模块总代理商
PLC端口上去的，它们的状态与PLC程序是息息相关的。从程序要求来看，没有必要去专门先学习这方面的课程，而是应该是用到就学、边学边用。待到一定程度后，再系统地学习一下，效果会*好。辑代数是从数学的角度来研究客观事物“真”与“假”之间的逻辑推理关系。在继电控制和PLC多学员都有这样的感觉，当从事某一项新的工作时，总感到自己缺乏系统的理论知识和丰富的实践知识。那么怎么办？一个字：学。理论知识可以系统地学，学习之前，应向周围的同行、同事去问一下，应学习哪些知识，有哪些书可以阅读，有没有系统的培训等。这样可以少走弯路，*学要还是靠自己。PLC的输入／输出系统功能完善，性能可靠，能够适应各种形式和性质的开关量和模拟量的输入／输出。PLC的功能单元能方便地实现D/A、A/D转换以及PID运算，实现过程控制、数字控制等功能。它还可以和其他计算机系统、控制设备共同组成分布式或分散式控制系统，能够很好地满足各种控制的需要。
Overview南京西门子模块总代理商
The SCALANCE XF204-2BA from Siemens is a new compact switch inSIMATIC ET 200SP design for factory automation and processautomation. It fulfills the recommendations of NAMUR NE 21,and is therefore suitable for use in process automation. Theflexible use of various BusAdapters allows support of electrical aswell as optical line, star and ring topologies.
XF-200BA versions are optimized for use in process automationand feature the following properties:
Conformal coating PCBs南京西门子模块总代理商
Max. installation altitude 4000 m
Extended temperature range from -40 °C to +70 °C
NAMUR NE 21-compliant
Firmware support for S2 device and CiR/H-CiR
Release and integration capability in SIMATIC PCS 7 and PCSneo
Connection of up to two modular BusAdapters (2 ports each)supported南京西门子模块总代理商
Enclosure in SIMATIC ET 200SP design (slim design,100 mm wide) for space-saving use in small control boxes
Integrated redundancy manager for configuring Fast Ethernet ringtopologies with fast MRP media redundancy
End-to-end system diagnostics with PROFINET, SNMP access,integrated web server or SINEC NMS and automatic email transmissionfunction for remote diagnostics and signaling via the network
H-Sync for implementation of system redundancy together with aSIMATIC S7-南京西门子模块总代理商1500R
The following BusAdapters are currently released for use withSCALANCE XF204-2BA (others available soon):
SIMATIC ET 200SP HA, BusAdapter BA 2×RJ45,2 RJ45 sockets南京西门子模块总代理商
SIMATIC ET 200SP HA, BusAdapter BA 2×FC,2 FastConnect connections
SIMATIC ET 200SP, BusAdapter BA 2×SCRJ,2 SCRJ FO connections
SIMATIC BA 2xRJ45VD HA, 2 RJ45 sockets with VD technology(variable distance)
SIMATIC ET 200SP, BusAdapter BA 2XRJ45, 2x RJ45 sockets
SIMATIC ET 200SP, BusAdapter BA 2xFC, 2x FastConnectconnections
SIMATIC ET 200SP, BusAdapter BA SCRJ/RJ45, 1x SCRJ FO connectionand 1x RJ45 connection
SIMATIC ET 200SP, BusAdapter BA SCRJ/FC, 1x SCRJ FO connectionand 1x FastConnect (FC) connection
SIMATIC ET 200SP, BusAdapter BA 2xLC (as of functionstatus 05), 2x LC FO connection, (as of functionstatus 05)
SIMATIC ET 200SP, BusAdapter BA LC/RJ45, 1x RJ45,1x LC FO connection, (as of function status 05)
SIMATIC ET 200SP, BusAdapter BA LC/FC, 1x RJ45FastConnect, 1x LC FO connection, (as of functionstatus 05)
ET 200SP HA, BusAdapter, BA 2XLC, 2x LC FO connection,(as of function status 05)
Productvariant南京西门子模块总代理商
SCALANCE XF204-2BA
The flexible use of various BusAdapters allows users to set upelectrical and optical line, star and ring topologies with theSCALANCE XF204-2BA.南京西门子模块总代理商
5．设计、施工、调试的，维护方便
继电器接触器控制系统中的中间继电器、时间继电器、计数器等电器元件，在PLC控制系统中是以“软元件”形式出现的，并且又用程序代替了硬接线，安装接线工作量少；工作人员也可提前根据具体的控制要求在PLC到货之前进行编程，大大地缩短了施工工期。
PLC体积小、重量轻，便于安装。PLC具有完善的自诊断及监视等功能，对于其内部的工作状态、通信状态、
南京西门子模块总代理商