描述
一般PLC是可以直接将指令发到控制回路里，但也可能先由继电器中转。打个比方，如果你PLC的输出口带电是24VDC的，但是你的控制回路里画的图需要PLC供的节点却是220VAC的，那么你就必须在PLC输出口加上一个继电器，即指令发出时继电器动作，但后让控制回路的节点接到继电器的常开或常闭点上。也是根据情况选择是否使用继电器。
EURESYS GRABLINK Expert 2 FRAME GRABBER CARD
COGNEX 8110 CVM6 32 VISION PROCESSOR CARD FRAME GRABBER
Perceptron Processor Board 495 0191 Frame Grabber 29400
Perceptron Frame Grabber Board 495 0191 29401
Perceptron Frame Grabber Board 495 0191 29402
Perceptron Frame Grabber Board 495 0191 00 29410
Perceptron DSP Frame Grabber 495 0191 96K 29411
USED Perceptron 96K DSP Frame Grabber 495 0191 Rev R
FUJI VME 4400 VISION CONTROL BOARD FRAME GRABBER COGNEX
DOMINO ALPHA 2 EURESYS REV A0 FRAME GRABBER
Matrox Pulsar PCI Frame Grabber Nice
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Matrox Corona 8 E K Frame Grabber Vision System Board
Euresys MULTO frame grabber card w digital 16 module
MuTech MV 500 MV500 or MV 510 MV510 PCI frame grabber
Euresys Domino Iota FRAME GRABBER Analog Image Acquisit
COGNEX 4400 FRAME GRABBER 44124 003 MODULE
Imaging Tech OFG VP1100 Frame Grabber
IDS FALCON PCI FRAME GRABBER KARTE REV3 FUER MPG D
