Say simply, FANUC system can divide for two parts: The systematic share that controls servo electromotor and movement of main shaft electromotor and control assist the PMC of electric part. PMC and PLC are very similar, because special at the machine tool, call so but controller of program machine tool. With traditional relay control circuit photograph is compared, the advantage of PMC has: Time is answered fast, control precision is tall, dependability is good, those who control a program to be able to follow applied situation is different and change, go to the lavatory with the interface of the computer and maintenance. Additional, because PMC uses software to realize control, can undertake online revise, have very big flexibility so, have extensive industrial versatility. The PMC that 0 system of FANUC uses has PMC-L and PMC-M two kinds of model, what they need hardware to differ, function also is distinguished somewhat. PMC-M needs a special circuit board, address limits also expands somewhat, the attention is asked when using. Next watches are the partial performance of PMC-L and PMC-M to compare a list. The function that expresses two kinds of model compares progression of PMC-LPMC-M program to carry out capacity of time 6ms2ms program on average what orders of 23 the first rank carry out periodic 16ms16/8ms to dictate basically 3000 steps are the biggest 8000 paces dictate instruction of several 1212 functions counts 3435 in-house relay basically 400 byte 696 byte the article. The program of PMC calls sequence control program, use at machine tool or other system sequence control, make CPU carries out arithmetical processing. The staff move of ordinal program is as follows: (1) allocates of of circumstance; according to what the function of the machine tool decides I/0 is nodded (the 2) requirement according to the movement of the machine tool and system weaves echelon pursues of; (3) uses a system to debug of of echelon graph; (solidify of program of plan of 4) general echelon is inside ROM chip. The working principle of PMC program can be summarized for on to below, by left to right, circular move back and forth, carry out orderly. Because it is the order that dictates to the program,carry out, should notice in microcosmic the distinction that goes up to dominate circuit with traditional relay, latter can consider as collateral pilot. 1 of to in an attempt to, graph two 2 circuit are exemple, after putting through in A contact, what action can coil of B, C have? If be relay circuit, can consider as collateral control, the distributinging position of movement and circuit has nothing to do, graph 1, graph the situation of 2 is same, all put through at the same time first for B, C, after that B disconnects. If be PMC program, so the circumstance of two graphs can differ somewhat. In the graph 1 in, the situation with relay is same, b, C puts through first, after that as a result of C put through disconnect B. In the graph 2 in, press the word that carries out orderly, however only C puts through, because of C put through make B coil cannot put through. In be applied actually, graph 1 medium B coil can use as the signal of ascendant edge pulse that inputs signal A. Of B put through time has a total cycle time only. PMC ordinal program is two parts by first grade cent: The first class and process of order of the 2nd rank. Differentiate first grade is to process the pulse signal with a few narrow width, these signal include urgent break alarm and feed to carry signal. Every 8ms executes order of order of the first rank, medium other time uses this 8ms to execute order of order of the 2nd rank. If if the 2nd class is ordinal the process is very long, must undertake differentiating to it, the time that the each part that differentiates and process of order of the first rank make 8ms jointly paragraph. The total cycle time that echelon pursues is to point to PMC program complete the time that executes place need. Total cycle time is equal to 8ms to take the amount that delimits with order of the 2nd rank substation is gotten, if process of the first form is very long, corresponding total cycle time also wants to expand. In PMC ordinal program, to enhance security, should notice use each other locks up processing. It is indispensable that to the each other of ordinal program the lock is handled, however in the machine tool the each other of the electric circuit terminal in electric ark is locked up also cannot oversight. Because, although logistic each other was used on ordinal program,lock up (software) , but appear when the hardware that is used at executing ordinal order when the problem, each other lock will lose action. So, also should offer each other to lock up in electric ark in order to ensure the safety of the machine tool. The address of PMC ordinal program expresses the position of clear signal. The input output signal that these addresses include pair of machine tools and the input to CNC / output signal, in-house relay, tally, maintain model table of relay, data. Each address by address number (every 8 signal) mix a date (0 comprise to 7) . The concern between signal name and address can indicate in the data-in in symbolic watch. The address has the following sort, symbol of distinct category address is not same also. X: Come by the machine tool the input signal of PMC (Y of of of PMC) of MT → : Come by PMC the output signal of the machine tool (F of of of MT) of PMC → : Come by NC the input signal of PMC (G of of of PMC) of CNC → : Come by PMC the output signal of NC (R of of of CNC) of PMC → : In-house relay D: Blame is easy system of FANUC O of of; offers the memory that lose a sex special operation face plate, the key-press of the face plate when using and LED have communication through address G, F and PMC, cannot use input address X20, X22 and output address Y51 right now, because they are used at undertaking scanning to key-press and LED by face plate. Additional, the choice in the parameter set when should editing ordinal program right now uses operation face plate. There are R and D in the address of PMC, they are systematic interior memory, but distinguish somewhat between them. The data in R address will be missing after cut off the power, when electrify among them content is 0. And after medium data cuts off the power, D address can be saved, consequently commonly used will do the parameter of PMC or occupy a watch with be valid. Normally the circumstance falls, r300 of R address area - R699 in all 400 byte. Should notice, the address limits summation of D area and R area also is 400 byte. Differentiate for D address inside R address right now a certain limits. For instance, to D address the definition gives 200 byte, so their address limits is D300 - D499, and right now the area of R address is R500 - R699. The amount that D address is in parameter set when we are editing ordinal program make set. In the work out process of PMC ordinal program, should notice input contact X cannot use as coil output, systematic condition outputs F to also cannot regard coil as output. To output coil, output address cannot repeat, otherwise the condition of this address cannot decide. To here, mention the timer instruction of PMC and tally statement even, every instruction should use the memory address of 5 byte, use D address normally, these addresses also can be used only and cannot repeat. Additional, timer date cannot repeat, tally date also cannot repeat. The instruction of PMC has two kinds: Basic instruction and function dictate. Basic instruction just undertakes to binary digit with, or, the logistic operation of blame; And the operation that functional instruction can fulfil a few specific functions, and it is pair of binary system byte or word undertake operating, also can have mathematical operation. The article had simple introduction to a few basic ideas of process designing of program of FANUC system PMC, hope to be helped somewhat to the user. More detailed data consults please the manual of PMC-L process designing of FANUC. CNC Milling