3.2 输出点组合应用扩展技术
输出点组合应用扩展技术的要点是将n个输出继电器号分为两组,每组个数各为n/2个,通过外部接线的技术组合,使每组每次有一个继电器有输出,则其可带(n/2)×(n/2)个负载,这种技术可节省(n/2)×(n/2)-n个输出点。如图12所示:用6个(注:n=6)输出点可以驱动9(3×3)个负载,节省了3个输出点,在梯形图编程时,需要用编码的方法确定每一个负载,每一个负载由行线和列线所在的输出继电器号共同承担。
3.3 机外处置扩展技术
PLC控制器有基本单元、扩展单元、扩展模块之分,其相对继电器-接触器控制电路而言,价格相对较高,尤其是在需要占用大量输出点时,还要对PLC基本单元进行扩展处理或需要选用更大点数的基本单元时,价格问题显得尤为**,因此在对某些控制逻辑简单而又不参与工作循环的电气设备或者在工作循环之前须先工作的设备而言,在用PLC进行总体控制设计时,这些设备可以不用PLC来控制其输出,而采用PLC机外处置的办法仍用继电器-接触器来进行控制,从而也达到了节省输出点的目的,并且可大大降低投资成本。[1>ME MADISON ELECTRIC 2 " EMT CONDUIT ELBOW 90 Degree 90DEG 2" TV-1170 12" SPAN
NPT 90 degree 304 stainless steel Pipe Fitting Female TC-304
Goodyear B105 Hy-T
THOMAS & BETTS 3137 1" 90 DEG.
STAGE GROUP SUBMERSIBLE DEEP WELL PUMP 5GPM 138326
Nibco CHEM-AIRE 1 1/2" T fitting SCH-80 PVC
ECN KORNS 1 1/4" RIGID STEEL CONDUIT ELBOW 90 Degree GALELB1-1/4X90 DEG 10" SPAN
Nibco CHEM-AIRE 1 1/2" 90 DEG SCH-80 PVC
Gates Truflex 2540 A52 1/2" X 54" V-Belt 12.5/13mm X 1370mm 6854
HAYWARD CEPEX CPX22068R0105 4" Flagged
Nibco CHEM-AIRE 1" x 1/2" adapter SCH-80
ADI 2 UHS 929175, PB122824, V40, 120MM x 40MM 35mm
ADI 4 UHS 929159, PB122826, V40, 120MM x 40MM 35mm D
Felco SWISS C16
CGW CAMEL AZ Surface Grinding Wheel 14"X 1"X 5" Straight, A97870, AZ46-J8-VN32A
NORTON Medium GRINDING WHEEL 24798, 605711, 12x2x1-1/4, NOS
COLONIAL ABRASIVE PRODUCTS, GRINDING WHEEL 10" X 1" X 3" 60I Pink 53-111-776
Lot of 4 Cincinnati Milacron 9A60-J6-VRW Grinding Wheel P2585-6KA 8 x 1/4 x1-1/4
Cincinnati Milacron 10A46-113-VKP, 018-102-261
Cincinnati Milacron 82A60-J8-V6, 018-103-513
Cincinnati Milacron 10A46-113-VKP, 018-102-261
Colonial Abrasive 53-110-837, 60k 32A
Cincinnati Milacron 10A60-H13-VKP 60 Grit
Cincinnati Milacron 32A60-16-VFM, 53-110-835
Cincinnati Milacron 82A60-K8-V6, 018-103-514
Colonial Abrasive 53-110-823, 60I 32A
Colonial Abrasive 53-111-563, 60 J 32A
Colonial Abrasive 53-111-705, 60 J Pink
Colonial Abrasive 53-110-789, 60 J 32A
Cincinnati Milacron 32A60-J4-VFM, P2342
Cincinnati Milacron 82A80-J8-V6
Cincinnati Milacron 32A60-J6-VFM
Cincinnati Milacron 10A80-K8-V6, 018-071-152
Cincinnati Milacron 10A80-L8-V6, 018-072-252
Cincinnati Milacron 10A80-K8-V6, 018-071-152
Colonial Abrasive 53-110-813, 80J 32A
Colonial Abrasive 53-110-808, 60I 32A
Cincinnati Milacron 9A46-J6-VRW, P4637-6KJ
Cincinnati Milacron 9A46-J6-VFM, 74438-1KF
Colonial Abrasive 53-111-413, 100I
Cincinnati Milacron 9A46-J6-VRW, 36021-JKM
Cincinnati Milacron 9A60-J5-VRW, P3718-6KJ
Cincinnati Milacron 9A60-G10-VA, P2316-1-BW
Cincinnati Milacron 9A100-I6-VRW, P4227-IKH
Cincinnati Milacron 10A46-KB-V6 Grinding Wheel, 018-071-338