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It plays a very important role in the automatic control system. Therefore, the correct choice of PLC is very important.
Faced with the most advanced types of PLCs from many manufacturers, they have their own advantages and disadvantages, which can satisfy the most advanced needs of users, but they are incompatible in terms of form, composition, function, network, and programming. , Without a consistent specification, horizontal comparison is impossible. Here are some opinions on PLC selection in the planning of automatic control system, which can be used as a reference when selecting PLC.
Able to compare the following aspects to choose a suitable product.
1. The amount of work
This is particularly important. At the beginning of the automatic control system planning, there should be an accurate statistics on the number of control points (digital and analog). This is often the primary condition for selecting a PLC. Generally, a PLC with 10% to 30% more control points should be selected. There are several considerations:
1. Able to compensate for missing points in the planning process;
2. It can be ensured that there can be a replacement point when there is a failure at a certain point in the running process;
3. The need to increase points in the future.
2. Operating environment
The operating environment is the hard target of PLC operations. The automatic control system frees people from busy work and harsh environments. It requires the automatic control system to be able to get used to the messy environment, such as temperature, humidity, noise, signal shielding, operating voltage, etc. The various PLCs are not the same. Be sure to choose products that are accustomed to the practical operating environment.
3. Communication network
Nowadays, PLC is no longer simple on-site control. PLC remote communication has become a problem that the control system must solve. However, the communication protocols drawn up by various manufacturers are very different and have poor compatibility. At this point, the following aspects should be considered first:
1. Communication between products of the same manufacturer. Each manufacturer has its own communication protocol, and there is more than one. This performance is obvious on large and medium-sized computers, but not the same on small and micro computers. Some manufacturers often do not have a relatively simple communication that is different from other protocols because of capacity, price, function and other considerations. Therefore, the primary consideration in this regard is the communication between different types of PLCs from the same manufacturer;
2. Communication between products of different manufacturers. If the planned automatic control system is part of the transformation of the existing automatic control system, and the PLC selected is different from the original system, perhaps two or more PLCs are required in the planning, and a different manufacturer’s PLC is selected. Products, which need to consider the communication issues between products of different manufacturers;
3. Whether it is beneficial to the future. Because the communication protocols drawn up by various manufacturers are different, and there is no consistent international standard, so the PLC selection is greatly restricted. It is necessary to consider a communication protocol that has a large impact, has development, is fully functional, and is close to common use.
AREVA PS421 89421-0-1420000-300-403-600-705-706
SIEMENS 6RA8 232-1DB0
IFM AC 2520
BECKHOFF EK9300 EK9300-1005
AVL EMISSION TCU 4000
EYCON20L01NONEELIN
SIEMENS 6ES5470-4UA12
SIGMATEK DIAS DM 321 DM321 01-008-321
HEIDENHAIN ROD 43050027S12-03
MANDELLI PLASMA ET090 CT090 9010/A
ANSALDO MILANO 211QS08299C
AMO WMKA2010S.1510..08-20-256-0,20-16S15-IU S024 1157647-59
HEIDENHAIN LIDA 10 297220-01
ANSALDO MILANO 211QS08337C
TR ELECTRONIC 110-00911
CAREL PGD0000I00
KEB HOMAG 00F5060-5A11
SICK DT50 DT50-P1124
ALLEN BRADLEY 1768-M04SE
GE FANUC OPER PNL 44C741024-G02R04
GOULD MG 24-15C
SCHNEIDER XPSAV11113P 086149
EATON VICKERS DG4V32AMUA660
PRO-FACE PRO FACE 3580205-04 AGP3200-T1-D24-M
IFM DN2035 POWER SUPPLY 3AC 340-576VAC
PC PACIFFIC CORPORATION CSC-795
BASLER SCA1300-32GC SCA130032GC 0000104449-10 000010444910
SIEMENS S42024-A1748-A1
SIEMENS S42024-A1799-A3 G01 S42024A1799A3 S42024-A1799-A302
SIEMENS 3RX9501-0BA00
BOSCH QV60 0811405099
BARBER COLMAN A-60150-4
SIEMENS 6ES5396-0UA11
MTRAC553SGA 526725UD
TSX1723428
HENGSTLER 0 565 096 0565096 AC58/0010ES.41DPI
Due to the irregular characteristics of the pelvic structure, the choice of internal fixation is diverse.
For patients separated symphysis pubis, a 2 or 4 holes, 4.5 or 3.5mm diameter dynamic compression plate or reconstruction plate can be used and fixed with full-thread cancellous bone screws.Another method of fixation is lag screw fixation. In patients with new sacroiliac joint dislocation with a forward approach,firm fixation can be achieved by using 2holes 3.5mm dynamic compression plates through the front of the sacroiliac joint. The posterior approach can also be used to insert 6.5mm lag screws into the sacral wings or hollow cancellous bone screws with interosseous compression for firm internal fixation. If available, the fracture may be fixed with 3.5mm or 4.5mm pelvic reconstruction plates and appropriate full-thread cancellous bone screws.
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Jiangsu Aomed Ortho Medical Technology Co.,Ltd , https://www.medthofixation.com