CPU 414-3 PN/DP 其它:
PROFINET Interface
使用 NTP 规程对时间同步进行参数化
信息指示功能状态和错误指示灯:
通过 LED 指示出内部和外部错误及运行状态,如运行 (RUN)、停止 (STOP)、重新启动 (Restart)、测试功能 (Test function) 等。
测试功能:
可使用编程设备显示程序执行中的信号状态,不考虑用户程序而修改过程变量,读取堆栈存储器的内容,运行单独程序步骤,并禁用程序组件。
信息功能:
可使用编程设备为用户提供有关存储器容量和 CPU 的工作模式,以及工作和负载存储器的当前使用率等方面的信息。
工作数据是PLC运行过程中经常变化、经常存取的一些数据。存放在RAM中,以适应随机存取的要求。在PLC的工作数据存储器中,设有存放输入输出继电器、继电器、定时器、计数器等逻辑器件的存储区,这些器件的状态都是由用户程序的初始设置和运行情况而确定的。根据需要,部分数据在掉电时用后备电池维持其现有的状态,这部分在掉电时可保存数据的存储区域称为保持数据区。
通常情况下,机械、设备生产线等的负载指恒转矩(G型)负载;一般风机、水泵类负载指平方转矩(P型)负载。
由于系统程序及工作数据与用户无直接联系,所以在PLC产品样本或使用手册中所列存储器的形式及容量是指用户程序存储器
当PLC提供的用户存
储器容量不够用,许LC还提供有存储器扩展功能。PLC存储器所用的种类主要有:可读/写操作的随机存储器RAM;只读存储器或可擦除可编程的只读存储器ROM、PROM、EPROM和EEPROM。
(1)现场控制单元
现场控制单元一般远离控制中心,安装在靠近现场的地方,其高度模块化结构可以根据过程监测和控制的需要配置成由几个点到数百个点的规模不等的过程控制单元。
现场控制单元的结构是由许多功能分散的插板(或称卡件)按照一定的逻辑或物理顺序安装在插板箱中,各现场控制单元及其与控制管理级之间采用总线连接,以实现信息交互。
现场控制单元的硬件配置需要完成以下内容:
插件的配置根据系统的要求和控制规模配置主机插件(CPU插件)、电源插件、I/O插件、通信插件等硬件设备;
硬件冗余配置对关键设备进行冗余配置是提高DCS**性的一个重要手段,DCS通常可以对主机插件、电源插件、通信插件和网
络、关键l/O插件都可
以实现冗余配置。
硬件安装不同的DCS,对于各种插件在插件箱中的安装,会在逻辑顺序或物理顺序上有相应的规定。另外,现场控制单元通常分为基本型和扩展型两种,所谓基本型就是各种插件安装在一个插件箱中,但更多的时候时需要可扩展的结构形式,即一个现场控制单元还包括若干数字输入/输出扩展单元,相互间采用总线连成一体。
应用CPU 416-2, CPU 416-3 and CPU 416-3 PN/DP are powerful SIMATIC S7-400 CPUs.
The integrated PROFIBUS DP interfaces in the CPU 416-2 and CPU 416-3 make it possible to connect directly to the PROFIBUS DP fieldbus as a master or slave.
An additional DP master system can be connected to the CPU 416-3 and CPU 416-3 PN/DP using the IF 964-DP interface module.
The integrated PROFINET interface of the CPU 416-3 PN/DP includes switch functionality when the ERTEC 400-ASIC is used. This forms the basis for providing two externally accessible PROFINET ports. In addition to hierarchical network topologies, this also enables the creation of line structures in the new S7-400 controllers.
Note:
only the 6ES7 964-2AA04-0AB0 interface submodule may be used.
Both CPUs are equipped with the following:
Powerful processor:
The CPUs achieve instruction execution times as low as 0.03 µs per binary instruction.
CPU 416-2: 5.6 MB RAM (of which 2.8 MB each for program and data);
CPU 416-3: 11.2 MB RAM (of which 5.6 MB each for program and data);
CPU 416-3 PN/DP: 11.2 MB RAM (of which 5.6 MB each for program and data);
fast RAM for parts of the user program relevant to execution.
Flexible expansion:
Up to 262144 digital and 16384 analog inputs/outputs.
Multi-point interface MPI:
With the MPI it is possible to establish simple networking of max. 32 stations at a data transmission rate of up to 12 Mbit/s. The CPUs can establish up to 44 connections to stations of the communications bus (C bus) and the MPI.
Mode selector switch:
Designed as toggle switch.
Diagnostics buffer:
The last 120 fault and interrupt events are retained in a ring buffer for diagnostic purposes. The number of entries can be parameterized.
Real-time clock:
The date and time are appended to diagnostic messages of the CPU.
Memory card:
For expansion of the integrated load memory. RAM and FEPROM cards (FEPROM for retentive storage) are available
Combined MPI/DP interface and integrated PROFIBUS DP interface (CPU 416-2 and CPU 416-3):
The PROFIBUS DP master interface allows a distributed automation configuration offering high speed and ease of use. From the user's point of view, the distributed I/O is treated as central I/O (same configuring, addressing and programming).
Mixed configuration: SIMATIC S5 and SIMATIC S7 as PROFIBUS master according to EN 50170.
CPU 416-3 and CPU 416-3 PN/DP also include:
A module slot:
An additional PROFIBUS DP master system can be connected via the IF 964-DP interface module.
CPU 416-3 PN/DP additionally includes:
PROFINET interface with 2 ports (switch):
PROFINET I/O, 256 IO devices connectable
PROFINET CBA