Tài liệu PLC Programming Methods and Applications P2 pptx

... loops and optional programming commands. The processor consists of the microprocessor, system memory, serial communication ports for printer, PLC LAN link and external programming device and, ... fundamental understanding of the various types of PLCs available, the advantages and disadvantages of each, and the way in which a PLC executes a program. The open frame, shoebox, a...

Ngày tải lên: 22/12/2013, 21:18

... 1-27 - OR -AND Lamp Circuit SWITCH1 and SWITCH2 and SWITCH3 SWITCH1 and SWITCH2 and SWITCH4 SWITCH1 and SWITCH3 and SWITCH4 SWITCH2 and SWITCH3 and SWITCH4 SWITCH1 and SWITCH2 and SWITCH3 and SWITCH4 The ... • ()() (1-3) SWITCH1 SWITCH2 SWITCH3 SWITCH4 LAMP3 L3 PB1 PB2 PB3 PB4 Figure 1-26 - AND- OR Lamp Circuit recommended. In a PLC, the ordering of the rungs is criti...

Ngày tải lên: 22/12/2013, 21:18

... Programmable Logic Controllers: Programming Methods and Applications by John R. Hackworth and Frederick D. Hackworth, Jr. Chapter 1 - Ladder Diagram Fundamentals 1-7 Figure ... IN3 ENTER 4. AND IN4 ENTER The LD command for IN3 causes the previous two lines of code (lines 1 and 2) to be transferred to the Stack. After lines 3 and 4 have been input, lines 1 and 2 will be ... I...

Ngày tải lên: 25/12/2013, 09:01

... by substitution into the differential equation and, as expected, are found to be -2 and respectively. Then x(t) = -2 + + + + and the constants and are determined by the three initial conditions. The ... 1) (3.1) where A and B are constants. Hence, using Table 2.1, it follows that = A + Be-’ (3.2) Therefore, if A and B were known, we would have the solution. The conditions on A...

Ngày tải lên: 22/12/2013, 21:18

... therefore common for hand tools and home appliances and also for such applications that require a high speed (above 3200 r.p.m) which is not possible in an a.c. machine. Likely applications are ... motors Applications requiring extremely small motors, in both size and horsepower, may be designed for shaded pole construction. Electronic drives, cassette players, recorders...

Ngày tải lên: 19/01/2014, 23:20

... X005 Y002 Y003 MPS MPP X006 MPS MPS MPP 0000 LD X000 0001 0002 AND X001 0003 0004 AND X002 0005 OUT Y000 0006 0007 AND X003 0008 OUT Y001 0009 0010 AND X004 0011 0012 AND X005 0013 OUT Y002 0014 0015 AND X006 0016 OUT Y003 MPS MPS MPP MPP MPS MPP Circuit ... X000 is OFF, and Y000 turns OFF when X000 is ON. INV instruction can be used in a same position as serial contact instruct...

Ngày tải lên: 15/10/2013, 16:27

... devices function in radio re- ceivers and transmitters, telephone networks, digital computers and satellite links (to name just a few applications) . Conductance and the siemens The better a substance ... of juice,” and the supply of chemical energy must be restored by charging. Some cells and batteries, such as lead-acid car batteries, can be recharged by driving current through t...

Ngày tải lên: 13/12/2013, 01:15

... secondary reference electrodes that are easier to construct and handle, less sensitive to impurities, and whose potential is very stable and well- known with respect to the SHE (Ref 1). The simpler ... reference and test electrodes must be minimized. These criteria are detailed subsequently. Stable and Reproducible Potential. Electrodes used as references should rapidly achieve a...

Ngày tải lên: 13/12/2013, 04:15

... purely to act as a holder of utility methods and fields. A static class cannot contain any instance data or methods, and it does not make sense to try and create an object from a static class ... Math. So, what's happening and how does this work? You will often find that not all methods naturally belong to an instance of a class; they are utility methods inasmuch as th...

Ngày tải lên: 15/12/2013, 00:15

... tool must withstand do depend on cutting speed and feed and rake angle, and on the work material’s 96 Work and tool materials Fig. 3.17 Machining characterisitcs of a low alloy (•) and a semi-free-cutting ... Work and tool materials Fig. 3.12 Representative specific force and shear plane angle variations for hot rolled carbon and alloy steels ( f = 0.15 mm, α = 6º) Fig. 3.13...

Ngày tải lên: 17/12/2013, 11:15