ABB PP836 3BSE042237R1 操作面板
制造商 : ABB
产品编号：3BSE042237R1
产品类型 : PP836 操作面板
面板 800 - PP836 操作面板
“6,5”“功能键面板”
TFT 640x480 像素，图形和文本，颜色
重量 : 1.3 公斤
Large PLC support redundancy for CPU, power supply, and possibly the control network, but typically not for I/O cards although there are large PLC that support I/O redundancy by using duplicate I/O-subsystems with separate backplanes where the field instruments are wired in parallel to both I/O subsystems.
The control network is typically a standard industrial Ethernet application protocol over Ethernet media and IP. For PLC the field cabling lands directly on the I/O card.PLC supports very fast scan times as required in discrete manufacturing, especially for discrete logic.
However, it should be noted that PID loops add to the CPU load much more than discrete logic thus making the scan time slower. The scan time, although fast, may vary with task loading.oops are not handled individually in a PLC. Addition or change to loop requires a download of the entire program which affects other loops in the CPU as well.The PLC configuration software is separate from the HMI software as they generally come from different manufacturers. That is, two separate databases.
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